Implemented TLazy + Tests

Src/Myc.Core.Futures.pas

@@ -7,15 +7,19 @@ uses
     Myc.Signals, Myc.TaskManager, Myc.Futures;
 
 type
-    // Abstract base class for IMycFuture<T> implementations.
     TMycFuture<T> = class abstract( TInterfacedObject, IMycFuture<T> )
     protected
         function GetResult: T; virtual; abstract;
         function GetDone: IMycState; virtual; abstract;
     end;
 
-    // Concrete future implementation triggered by an initial state, executing a TFunc<T>.
-    TMycInitStateFuncFuture<T> = class( TMycFuture<T> )
+    TMycNullFuture<T> = class( TMycFuture<T> )
+    protected
+        function GetResult: T; override;
+        function GetDone: IMycState; override;
+    end;
+
+    TMycGateFuncFuture<T> = class(TMycFuture<T>)
     private
         FInit: TMycSubscription;
         FDone: IMycLatch;
@@ -24,20 +28,31 @@ type
         function GetResult: T; override;
         function GetDone: IMycState; override;
     public
-        // Creates a future that executes AProc after AGate is set, using ATaskFactory.
         constructor Create( const ATaskManager: IMycTaskManager; const AGate: IMycState; AProc: TFunc<T> );
         destructor Destroy; override;
     end;
 
 implementation
 
-{ TMycInitStateFuncFuture<T> }
+{ TMycNullFuture<T> }
 
-constructor TMycInitStateFuncFuture<T>.Create( const ATaskManager: IMycTaskManager; const AGate: IMycState; AProc: TFunc<T> );
+function TMycNullFuture<T>.GetDone: IMycState;
+begin
+    Result := TState.Null;
+end;
+
+function TMycNullFuture<T>.GetResult: T;
+begin
+    Result := Default(T);
+end;
+
+{ TMycGateFuncFuture<T> }
+
+constructor TMycGateFuncFuture<T>.Create(const ATaskManager: IMycTaskManager; const AGate: IMycState; AProc: TFunc<T>);
 begin
     inherited Create;
 
-    FDone := TState.CreateLatch( 1 );
+    FDone := TLatch.Construct( 1 );
 
     // Subscribe the job execution to AGate.
     // The job will run when AGate notifies the subscriber returned by Run.
@@ -58,7 +73,7 @@ begin
         end );
 end;
 
-destructor TMycInitStateFuncFuture<T>.Destroy;
+destructor TMycGateFuncFuture<T>.Destroy;
 begin
     Assert( FDone.State.IsSet );
 
@@ -66,12 +81,12 @@ begin
     inherited Destroy;
 end;
 
-function TMycInitStateFuncFuture<T>.GetDone: IMycState;
+function TMycGateFuncFuture<T>.GetDone: IMycState;
 begin
     Result := FDone.State;
 end;
 
-function TMycInitStateFuncFuture<T>.GetResult: T;
+function TMycGateFuncFuture<T>.GetResult: T;
 begin
     Assert( FDone.State.IsSet, 'Result is not yet available.' );
     Result := FResult;

Src/Myc.Core.Lazy.pas

@@ -0,0 +1,85 @@
+unit Myc.Core.Lazy;
+
+interface
+
+uses
+    System.SysUtils,
+    Myc.Signals,
+    Myc.Lazy;
+
+type
+    TMycLazy<T> = class abstract( TInterfacedObject, IMycLazy<T> )
+    protected
+        function GetChanged: IMycState; virtual; abstract;
+    public
+        function Pop( out Res: T ): Boolean; virtual; abstract;
+    end;
+
+    TMycNullLazy<T> = class( TMycLazy<T> )
+    protected
+        function GetChanged: IMycState; override;
+    public
+        function Pop( out Res: T ): Boolean; override;
+    end;
+
+    TMycFuncLazy<T> = class( TMycLazy<T> )
+    private
+        FChanged: IMycDirty;
+        FChangeState: TMycSubscription;
+        FProc: TFunc<T>;
+    protected
+        function GetChanged: IMycState; override;
+    public
+        constructor Create( const AChanged: IMycState; const AProc: TFunc<T> );
+        destructor Destroy; override;
+        function Pop( out Res: T ): Boolean; override;
+    end;
+
+implementation
+
+{ TMycNullLazy<T> }
+
+function TMycNullLazy<T>.GetChanged: IMycState;
+begin
+    Result := TState.Null;
+end;
+
+function TMycNullLazy<T>.Pop( out Res: T ): Boolean;
+begin
+    Res := Default ( T );
+    Result := true;
+end;
+
+{ TMycFuncLazy<T> }
+
+constructor TMycFuncLazy<T>.Create( const AChanged: IMycState; const AProc: TFunc<T> );
+begin
+    inherited Create;
+    FChanged := TDirty.Construct;
+    FProc := AProc;
+    FChangeState := AChanged.Subscribe( FChanged );
+end;
+
+destructor TMycFuncLazy<T>.Destroy;
+begin
+    FChangeState.Unsubscribe;
+    inherited;
+end;
+
+function TMycFuncLazy<T>.GetChanged: IMycState;
+begin
+    Result := FChanged.State;
+end;
+
+function TMycFuncLazy<T>.Pop( out Res: T ): Boolean;
+begin
+    Result := FChanged.State.IsSet;
+    if Result then
+    begin
+        if Assigned( FProc ) then
+            Res := FProc;
+        FChanged.Reset;
+    end;
+end;
+
+end.

Src/Myc.Core.Signals.pas

@@ -9,18 +9,12 @@ uses
 
 type
     TMycState = class abstract( TInterfacedObject, IMycState )
-    strict private
-    class var
-        FNull: IMycState;
-        class constructor ClassCreate;
     protected
         function GetIsSet: Boolean; virtual; abstract;
     public
         function Subscribe(Subscriber: IMycSubscriber): TMycSubscription; virtual; abstract;
         procedure Unsubscribe(Tag: TMycNotifyList<IMycSubscriber>.TTag); virtual; abstract;
         property IsSet: Boolean read GetIsSet;
-        // Provides access to the singleton null latch instance (always set).
-        class property Null: IMycState read FNull;
     end;
 
     // TMycNullState implements a "null object" pattern for IMycState.
@@ -42,9 +36,6 @@ type
     TMycLatch = class(TMycState, IMycLatch)
     strict private
         FSubscribers: TMycNotifyList<IMycSubscriber>; // List of subscribers waiting for this latch to be set.
-    class var
-        FNull: IMycLatch; // Singleton instance of a latch that is always set.
-        class constructor ClassCreate; // Class constructor to initialize FNull.
     private
         [volatile] FCount: Integer; // The internal countdown value for the latch.
         function GetState: IMycState; // Implementation for IMycLatch.GetState and IMycFlag.GetState.
@@ -56,9 +47,6 @@ type
         constructor Create(ACount: Integer);
         destructor Destroy; override;
 
-        // Factory method: creates a new countdown latch or returns the Null latch if Count <= 0.
-        class function CreateLatch(Count: Integer): IMycLatch; static;
-
         // IMycSignal implementation
         function Subscribe(Subscriber: IMycSubscriber): TMycSubscription; override;
         procedure Unsubscribe(Tag: TMycNotifyList<IMycSubscriber>.TTag); override;
@@ -67,9 +55,12 @@ type
         // Decrements the internal count. If the count reaches zero,
         // registered subscribers are notified, and the latch becomes permanently set.
         function Notify: Boolean;
+    end;
 
-        // Provides access to the singleton null latch instance (always set).
-        class property Null: IMycLatch read FNull;
+    TMycNullLatch = class( TInterfacedObject, IMycLatch )
+    private
+        function GetState: IMycState;
+        function Notify: Boolean;
     end;
 
     // TMycDirty implements a resettable "dirty flag".
@@ -91,7 +82,6 @@ type
         // Factory method to create a new TMycDirty instance.
         class function CreateDirty: IMycDirty; static;
 
-        // IMycSignal implementation
         function Subscribe(Subscriber: IMycSubscriber): TMycSubscription; override;
         procedure Unsubscribe(Tag: TMycNotifyList<IMycSubscriber>.TTag); override;
 
@@ -103,17 +93,18 @@ type
         function Reset: Boolean;
     end;
 
+    TMycNullDirty = class( TInterfacedObject, IMycDirty )
+    private
+        function GetState: IMycState;
+        function Notify: Boolean;
+        function Reset: Boolean;
+    end;
+
 implementation
 
 uses
     System.SyncObjs; // For TInterlocked
 
-class constructor TMycState.ClassCreate;
-begin
-    // Create a singleton null latch instance that is initially (and always) set.
-    FNull := TMycNullState.Create(); // Calls the instance constructor
-end;
-
 { TMycNullState }
 
 constructor TMycNullState.Create;
@@ -142,6 +133,18 @@ begin
     // Unsubscribing from a null state has no effect.
 end;
 
+{ TMycNullLatch }
+
+function TMycNullLatch.GetState: IMycState;
+begin
+    Result := TState.Null;
+end;
+
+function TMycNullLatch.Notify: Boolean;
+begin
+    Result := false;
+end;
+
 { TMycLatch }
 
 constructor TMycLatch.Create(ACount: Integer);
@@ -152,27 +155,12 @@ begin
     FSubscribers.Create;
 end;
 
-class constructor TMycLatch.ClassCreate;
-begin
-    // Create a singleton null latch instance that is initially (and always) set.
-    FNull := TMycLatch.Create(0); // Calls the instance constructor
-end;
-
 destructor TMycLatch.Destroy;
 begin
     FSubscribers.Destroy;
     inherited;
 end;
 
-class function TMycLatch.CreateLatch(Count: Integer): IMycLatch;
-begin
-    // Factory method: returns a new latch or the shared Null latch if Count <= 0.
-    if Count > 0 then
-        Result := TMycLatch.Create(Count) // Instance constructor
-    else
-        Result := FNull;
-end;
-
 function TMycLatch.Notify: Boolean;
 var
     currentCountAfterDecrement: Integer;
@@ -259,6 +247,23 @@ begin
     end;
 end;
 
+{ TMycNullDirty }
+
+function TMycNullDirty.GetState: IMycState;
+begin
+    Result := TState.Null;
+end;
+
+function TMycNullDirty.Notify: Boolean;
+begin
+    Result := false;
+end;
+
+function TMycNullDirty.Reset: Boolean;
+begin
+    Result := true;
+end;
+
 { TMycDirty }
 
 constructor TMycDirty.Create;

Src/Myc.Core.Tasks.pas

@@ -150,7 +150,7 @@ begin
         FWorkThreads[i].Free;
 
     if Assigned(FException) then
-        FException.Free;
+        FException.Free;
 
     FWorkGate.Free;
     FWorkStack.Clear;
@@ -203,7 +203,7 @@ var
     capturedProc: TProc;
 begin
     // Create a latch that will be signaled when the proc finishes
-    res := TMycLatch.CreateLatch(1); // Changed to use direct static call on TMycLatch
+    res := TLatch.Construct(1); // Changed to use direct static call on TMycLatch
 
     capturedProc := Proc; // Capture Proc for the anonymous method
     CreateAnonymousThread('Thread',
@@ -303,7 +303,7 @@ begin
         raise ETaskException.Create('Task factory terminated');
 
     if not Assigned(Job) then
-        exit(TMycLatch.Null); // Already correct, uses direct static property on TMycLatch
+        exit(TLatch.Null); // Already correct, uses direct static property on TMycLatch
 
     // Create a pending job
     Result := TMycPendingJob.Create(Self, Job);

Src/Myc.Futures.pas

@@ -20,16 +20,20 @@ type
     end;
 
     TFuture<T> = record
-    strict private
+    private
         FFuture: IMycFuture<T>;
         function GetDone: IMycState; inline;
         function GetResult: T; inline;
 
+    class var
+        FNull: IMycFuture<T>;
+
         class constructor CreateClass;
         class destructor DestroyClass;
 
     public
         constructor Create(const AFuture: IMycFuture<T>);
+
         class operator Implicit(const A: IMycFuture<T>): TFuture<T>; overload;
         class operator Implicit(const A: TFuture<T>): IMycFuture<T>; overload;
 
@@ -52,11 +56,14 @@ uses
 constructor TFuture<T>.Create(const AFuture: IMycFuture<T>);
 begin
     FFuture := AFuture;
+    if not Assigned(FFuture) then
+        FFuture := FNull;
 end;
 
 class constructor TFuture<T>.CreateClass;
 begin
     TMycTaskFactory.AquireTaskManager;
+    FNull := TMycNullFuture<T>.Create;
 end;
 
 class destructor TFuture<T>.DestroyClass;
@@ -77,12 +84,12 @@ end;
 
 class function TFuture<T>.Construct(const Proc: TFunc<T>): IMycFuture<T>;
 begin
-    Result := TMycInitStateFuncFuture<T>.Create( TaskManager, nil, Proc );
+    Result := TMycGateFuncFuture<T>.Create( TaskManager, nil, Proc );
 end;
 
 class function TFuture<T>.Construct(const Gate: IMycState; const Proc: TFunc<T>): IMycFuture<T>;
 begin
-    Result := TMycInitStateFuncFuture<T>.Create( TaskManager, Gate, Proc );
+    Result := TMycGateFuncFuture<T>.Create( TaskManager, Gate, Proc );
 end;
 
 function TFuture<T>.GetDone: IMycState;

Src/Myc.Lazy.pas

@@ -0,0 +1,81 @@
+unit Myc.Lazy;
+
+interface
+
+uses
+    System.SysUtils,
+    Myc.Signals;
+
+type
+    IMycLazy<T> = interface
+        {$REGION 'property access'}
+        function GetChanged: IMycState;
+        {$ENDREGION}
+        function Pop( out Res: T ): Boolean;
+        property Changed: IMycState read GetChanged;
+    end;
+
+    TLazy<T> = record
+    private
+        FLazy: IMycLazy<T>;
+        function GetChanged: IMycState; inline;
+    class var
+        FNull: IMycLazy<T>;
+        class constructor CreateClass;
+
+    public
+        constructor Create(const ALazy: IMycLazy<T>);
+
+        class function Construct( const Changing: IMycState; const Proc: TFunc<T> ): IMycLazy<T>; static;
+
+        class operator Implicit(const A: IMycLazy<T>): TLazy<T>; overload;
+        class operator Implicit(const A: TLazy<T>): IMycLazy<T>; overload;
+
+        function Pop(out Res: T): Boolean; inline;
+
+        property Changed: IMycState read GetChanged;
+    end;
+
+implementation
+
+uses
+    Myc.Core.Lazy;
+
+constructor TLazy<T>.Create(const ALazy: IMycLazy<T>);
+begin
+    FLazy := ALazy;
+    if not Assigned(FLazy) then
+        FLazy := FNull;
+end;
+
+class function TLazy<T>.Construct(const Changing: IMycState; const Proc: TFunc<T>): IMycLazy<T>;
+begin
+    Result := TMycFuncLazy<T>.Create( Changing, Proc );
+end;
+
+class constructor TLazy<T>.CreateClass;
+begin
+    FNull := TMycNullLazy<T>.Create;
+end;
+
+function TLazy<T>.GetChanged: IMycState;
+begin
+    Result := FLazy.Changed;
+end;
+
+function TLazy<T>.Pop(out Res: T): Boolean;
+begin
+    Result := FLazy.Pop( Res );
+end;
+
+class operator TLazy<T>.Implicit(const A: IMycLazy<T>): TLazy<T>;
+begin
+    Result.Create( A );
+end;
+
+class operator TLazy<T>.Implicit(const A: TLazy<T>): IMycLazy<T>;
+begin
+    Result := A.FLazy;
+end;
+
+end.

Src/Myc.Signals.pas

@@ -24,7 +24,7 @@ type
         // Unsubscribes from the associated TState.
         procedure Unsubscribe;
         class operator Initialize( out Dest: TMycSubscription );
-        property TState: IMycState read GetState;
+        property State: IMycState read GetState;
     end;
 
     IMycState = interface
@@ -39,6 +39,30 @@ type
         property IsSet: Boolean read GetIsSet;
     end;
 
+    TState = record // helper for IMycState
+    strict private
+    class var
+        FNull: IMycState;
+        class constructor ClassCreate;
+    private
+        FState: IMycState;
+        function GetIsSet: Boolean; inline;
+    public
+        constructor Create(const AState: IMycState);
+        class operator Implicit(const A: IMycState): TState; overload;
+        class operator Implicit(const A: TState): IMycState; overload;
+
+        class function All( const States: TArray<IMycState> ): IMycState; static;
+        class function Any( const States: TArray<IMycState> ): IMycState; static;
+
+        class property Null: IMycState read FNull;
+
+        function Subscribe(Subscriber: IMycSubscriber): TMycSubscription; inline;
+        procedure Unsubscribe(Tag: Pointer); inline;
+
+        property IsSet: Boolean read GetIsSet;
+    end;
+
     // IMycLatch is a specific type of flag that, once set, remains set (non-resettable).
     // It typically becomes set when an internal countdown reaches zero.
     IMycLatch = interface( IMycSubscriber )
@@ -48,6 +72,16 @@ type
         // Inherits IMycSubscriber and State property from IMycFlag. No new members.
     end;
 
+    TLatch = record
+    strict private
+    class var
+        FNull: IMycLatch;
+        class constructor ClassCreate;
+    public
+        class function Construct(Count: Integer): IMycLatch; static;
+        class property Null: IMycLatch read FNull;
+    end;
+
     // IMycDirty represents a resettable flag, typically indicating if a State is "dirty" (requiring attention) or "clean".
     // It inherits from IMycFlag, meaning it has a State, can be notified, and subscribed to.
     IMycDirty = interface( IMycSubscriber )
@@ -59,19 +93,14 @@ type
         property State: IMycState read GetState;
     end;
 
-    TState = record
-    private
-        FState: IMycState;
-        class function GetNull: IMycState; static;
+    TDirty = record
+    strict private
+    class var
+        FNull: IMycDirty;
+        class constructor ClassCreate;
     public
-        constructor Create(const AState: IMycState);
-        class function CreateLatch( Count: Integer ): IMycLatch; static;
-        class function CreateDirty: IMycDirty; static;
-        class function All( const States: TArray<IMycState> ): IMycState; static;
-        class function Any( const States: TArray<IMycState> ): IMycState; static;
-        class operator Implicit(const A: IMycState): TState; overload;
-        class operator Implicit(const A: TState): IMycState; overload;
-        class property Null: IMycState read GetNull;
+        class function Construct: IMycDirty; static;
+        class property Null: IMycDirty read FNull;
     end;
 
 implementation
@@ -92,7 +121,7 @@ end;
 procedure TMycSubscription.Unsubscribe;
 begin
     FState.Unsubscribe( FTag );
-    FState := TMycState.Null;
+    FState := TState.Null;
     FTag := nil;
 end;
 
@@ -103,7 +132,7 @@ end;
 
 class operator TMycSubscription.Initialize( out Dest: TMycSubscription );
 begin
-    Dest.FState := TMycState.Null;
+    Dest.FState := TState.Null;
     Dest.FTag := nil;
 end;
 
@@ -113,19 +142,20 @@ constructor TState.Create(const AState: IMycState);
 begin
     FState := AState;
     if not Assigned(FState) then
-        FState := TMycState.Null;
+        FState := FNull;
 end;
 
-class function TState.CreateLatch( Count: Integer ): IMycLatch;
+class constructor TState.ClassCreate;
 begin
-    Result := TMycLatch.CreateLatch( Count );
+    // Create a singleton null latch instance that is initially (and always) set.
+    FNull := TMycNullState.Create(); // Calls the instance constructor
 end;
 
 class function TState.All( const States: TArray<IMycState> ): IMycState;
 var
     Latch: IMycLatch;
 begin
-    Latch := CreateLatch( Length( States ) );
+    Latch := TLatch.Construct( Length( States ) );
     for var i := 0 to High( States ) do
         States[i].Subscribe( Latch );
     Result := Latch.State;
@@ -141,21 +171,26 @@ begin
     end
     else
     begin
-        Latch := CreateLatch( 1 );
+        Latch := TLatch.Construct( 1 );
         for var i := 0 to High( States ) do
             States[i].Subscribe( Latch );
         Result := Latch.State;
     end;
 end;
 
-class function TState.CreateDirty: IMycDirty;
+function TState.GetIsSet: Boolean;
 begin
-    Result := TMycDirty.CreateDirty;
+    Result := FState.IsSet;
 end;
 
-class function TState.GetNull: IMycState;
+function TState.Subscribe(Subscriber: IMycSubscriber): TMycSubscription;
 begin
-    Result := TMycState.Null;
+    Result := FState.Subscribe(Subscriber);
+end;
+
+procedure TState.Unsubscribe(Tag: Pointer);
+begin
+    FState.Unsubscribe(Tag);
 end;
 
 class operator TState.Implicit(const A: TState): IMycState;
@@ -168,4 +203,32 @@ begin
     Result.Create( A );
 end;
 
+{ TLatch }
+
+class constructor TLatch.ClassCreate;
+begin
+    // Create a singleton null latch instance that is initially (and always) set.
+    FNull := TMycNullLatch.Create; // Calls the instance constructor
+end;
+
+class function TLatch.Construct(Count: Integer): IMycLatch;
+begin
+    if Count > 0 then
+        Result := TMycLatch.Create( Count )
+    else
+        Result := FNull;
+end;
+
+{ TDirty }
+
+class constructor TDirty.ClassCreate;
+begin
+    FNull := TMycNullDirty.Create;
+end;
+
+class function TDirty.Construct: IMycDirty;
+begin
+    Result := TMycDirty.Create;
+end;
+
 end.

Src/Myc.Test.Core.Lazy.pas

@@ -0,0 +1,456 @@
+unit Myc.Test.Core.Lazy;
+
+interface
+
+uses
+    System.SysUtils,
+    DUnitX.TestFramework,
+    Myc.Signals,       // For IMycState, TState, IMycDirty
+    Myc.Lazy,          // For IMycLazy<T>
+    Myc.Core.Lazy;     // Unit to be tested
+
+type
+    [TestFixture]
+    TTestMycCoreLazy = class(TObject)
+    private
+        procedure Helper_ConsumeInitialPop(const ALazy: IMycLazy<Integer>; InitialExpectedValue: Integer); overload;
+        procedure Helper_ConsumeInitialPop(const ALazy: IMycLazy<string>; const InitialExpectedValue: string); overload;
+    public
+        [Setup]
+        procedure Setup;
+        [TearDown]
+        procedure TearDown;
+
+        // Tests for TMycNullLazy<T>
+        [Test]
+        procedure TestNullLazy_GetChanged_IsAlwaysNullState;
+        [Test]
+        procedure TestNullLazy_Pop_ReturnsDefaultIntegerAndTrue;
+        [Test]
+        procedure TestNullLazy_Pop_ReturnsDefaultStringAndTrue;
+        [Test]
+        procedure TestNullLazy_Pop_ReturnsDefaultInterfaceAndTrue;
+
+        // Tests for TMycFuncLazy<T> reflecting "IsSet is true by design after creation"
+        [Test]
+        procedure TestFuncLazy_GetChanged_IsAlwaysTrueAfterCreation;
+        [Test]
+        procedure TestFuncLazy_FirstPop_AlwaysEvaluatesAndResetsChanged;
+        [Test]
+        procedure TestFuncLazy_Pop_WhenProcIsNull_FirstPopReturnsTrueAndValueUnchanged_ResetsChanged;
+
+        // Tests for behavior after the initial "changed" state is consumed
+        [Test]
+        procedure TestFuncLazy_AfterFirstPop_IfNoSourceChange_GetChangedIsFalse;
+        [Test]
+        procedure TestFuncLazy_AfterFirstPop_IfNoSourceChange_PopReturnsFalse_ValueUndefined;
+        [Test]
+        procedure TestFuncLazy_AfterSourceChange_GetChanged_IsSet;
+        [Test]
+        procedure TestFuncLazy_AfterSourceChange_Pop_ReturnsTrueAndProcResult_ResetsChanged;
+
+        [Test]
+        procedure TestFuncLazy_Pop_Twice_SourceUnchanged_SecondPopReturnsFalse_ValueUndefined;
+        // This test is now significantly changed to reflect TMycDirty's notification behavior
+        [Test]
+        procedure TestFuncLazy_SourceInteraction_NotifyOnSetSourceDoesNotRetriggerLazy;
+        [Test]
+        procedure TestFuncLazy_Destroy_UnsubscribesFromSource;
+        [Test]
+        procedure TestFuncLazy_SourceIsInitiallySet_PopBehavesCorrectly;
+    end;
+
+implementation
+
+uses
+    System.Rtti,
+    Myc.Core.Signals;
+
+{ TTestMycCoreLazy Helper Methods }
+
+procedure TTestMycCoreLazy.Helper_ConsumeInitialPop(const ALazy: IMycLazy<Integer>; InitialExpectedValue: Integer);
+var
+    tempValue: Integer;
+    popResult: Boolean;
+begin
+    Assert.IsTrue(ALazy.GetChanged.IsSet, 'Changed.IsSet should be true before consuming initial pop');
+    popResult := ALazy.Pop(tempValue);
+    Assert.IsTrue(popResult, 'Consuming initial Pop should return true');
+    Assert.AreEqual(InitialExpectedValue, tempValue, 'Value from initial Pop is unexpected');
+    Assert.IsFalse(ALazy.GetChanged.IsSet, 'Changed.IsSet should be false after consuming initial pop');
+end;
+
+procedure TTestMycCoreLazy.Helper_ConsumeInitialPop(const ALazy: IMycLazy<string>; const InitialExpectedValue: string);
+var
+    tempValue: string;
+    popResult: Boolean;
+begin
+    Assert.IsTrue(ALazy.GetChanged.IsSet, 'Changed.IsSet should be true before consuming initial pop');
+    popResult := ALazy.Pop(tempValue);
+    Assert.IsTrue(popResult, 'Consuming initial Pop should return true');
+    Assert.AreEqual(InitialExpectedValue, tempValue, 'Value from initial Pop is unexpected');
+    Assert.IsFalse(ALazy.GetChanged.IsSet, 'Changed.IsSet should be false after consuming initial pop');
+end;
+
+{ TTestMycCoreLazy Test Methods }
+
+procedure TTestMycCoreLazy.Setup;
+begin
+end;
+
+procedure TTestMycCoreLazy.TearDown;
+begin
+end;
+
+// == Tests for TMycNullLazy<T> ==
+procedure TTestMycCoreLazy.TestNullLazy_GetChanged_IsAlwaysNullState;
+var
+    nullLazy: IMycLazy<Integer>;
+    changedState: IMycState;
+begin
+    nullLazy := TMycNullLazy<Integer>.Create as IMycLazy<Integer>;
+    Assert.IsNotNull(nullLazy, 'TMycNullLazy<Integer> instance should not be nil');
+    changedState := nullLazy.GetChanged;
+    Assert.AreSame(TState.Null, changedState, 'TMycNullLazy.GetChanged should return TState.Null');
+    Assert.IsTrue(changedState.IsSet, 'TState.Null should always be set');
+end;
+
+procedure TTestMycCoreLazy.TestNullLazy_Pop_ReturnsDefaultIntegerAndTrue;
+var
+    nullLazy: IMycLazy<Integer>;
+    value: Integer;
+    result: Boolean;
+begin
+    nullLazy := TMycNullLazy<Integer>.Create as IMycLazy<Integer>;
+    Assert.IsNotNull(nullLazy, 'TMycNullLazy<Integer> instance should not be nil');
+    value := 123;
+    result := nullLazy.Pop(value);
+    Assert.IsTrue(result, 'TMycNullLazy.Pop should return true');
+    Assert.AreEqual(Default(Integer), value, 'Value should be Default(Integer) after Pop');
+end;
+
+procedure TTestMycCoreLazy.TestNullLazy_Pop_ReturnsDefaultStringAndTrue;
+var
+    nullLazy: IMycLazy<string>;
+    value: string;
+    result: Boolean;
+begin
+    nullLazy := TMycNullLazy<string>.Create as IMycLazy<string>;
+    Assert.IsNotNull(nullLazy, 'TMycNullLazy<string> instance should not be nil');
+    value := 'test';
+    result := nullLazy.Pop(value);
+    Assert.IsTrue(result, 'TMycNullLazy.Pop should return true');
+    Assert.AreEqual(Default(string), value, 'Value should be Default(string) after Pop');
+end;
+
+procedure TTestMycCoreLazy.TestNullLazy_Pop_ReturnsDefaultInterfaceAndTrue;
+var
+    nullLazy: IMycLazy<IMycState>;
+    value: IMycState;
+    result: Boolean;
+begin
+    nullLazy := TMycNullLazy<IMycState>.Create as IMycLazy<IMycState>;
+    Assert.IsNotNull(nullLazy, 'TMycNullLazy<IMycState> instance should not be nil');
+    value := TState.Null;
+    result := nullLazy.Pop(value);
+    Assert.IsTrue(result, 'TMycNullLazy.Pop should return true');
+    Assert.IsNull(value, 'Value should be nil for an interface type after Pop from NullLazy');
+end;
+
+// == Tests for TMycFuncLazy<T> - Initial State by Design ==
+procedure TTestMycCoreLazy.TestFuncLazy_GetChanged_IsAlwaysTrueAfterCreation;
+var
+    funcLazy: IMycLazy<Integer>;
+    changedState: IMycState;
+    sourceDirty: IMycDirty;
+begin
+    sourceDirty := TDirty.Construct;
+    sourceDirty.Reset;
+    funcLazy := TMycFuncLazy<Integer>.Create(sourceDirty.State, function: Integer begin Result := 10; end);
+    Assert.IsNotNull(funcLazy, 'TMycFuncLazy<Integer> instance should not be nil');
+    changedState := funcLazy.GetChanged;
+    Assert.IsNotNull(changedState, 'funcLazy.GetChanged should return a valid IMycState');
+    Assert.IsTrue(changedState.IsSet, 'By design, funcLazy.GetChanged.IsSet should be true immediately after creation');
+end;
+
+procedure TTestMycCoreLazy.TestFuncLazy_FirstPop_AlwaysEvaluatesAndResetsChanged;
+var
+    funcLazy: IMycLazy<Integer>;
+    value: Integer;
+    result: Boolean;
+    sourceDirty: IMycDirty;
+    procExecuted: Boolean;
+    expectedValue: Integer;
+begin
+    sourceDirty := TDirty.Construct;
+    sourceDirty.Reset;
+    procExecuted := False;
+    expectedValue := 50;
+    funcLazy := TMycFuncLazy<Integer>.Create(sourceDirty.State,
+        function: Integer
+        begin
+            procExecuted := True;
+            Result := expectedValue;
+        end);
+    Assert.IsNotNull(funcLazy, 'TMycFuncLazy<Integer> instance should not be nil');
+    Assert.IsTrue(funcLazy.GetChanged.IsSet, 'Changed.IsSet should be true before the first Pop by design');
+    value := 0;
+    result := funcLazy.Pop(value);
+    Assert.IsTrue(result, 'The first Pop should return true by design, indicating evaluation');
+    Assert.IsTrue(procExecuted, 'FProc should have been executed on the first Pop');
+    Assert.AreEqual(expectedValue, value, 'Value should be the result from FProc after the first Pop');
+    Assert.IsFalse(funcLazy.GetChanged.IsSet, 'Changed.IsSet should be false after the first Pop, as Pop resets it');
+end;
+
+procedure TTestMycCoreLazy.TestFuncLazy_Pop_WhenProcIsNull_FirstPopReturnsTrueAndValueUnchanged_ResetsChanged;
+var
+    funcLazy: IMycLazy<Integer>;
+    value: Integer;
+    preCallValue: Integer;
+    result: Boolean;
+    sourceDirty: IMycDirty;
+begin
+    sourceDirty := TDirty.Construct;
+    sourceDirty.Reset;
+    funcLazy := TMycFuncLazy<Integer>.Create(sourceDirty.State, nil);
+    Assert.IsNotNull(funcLazy, 'TMycFuncLazy<Integer> instance should not be nil');
+    Assert.IsTrue(funcLazy.GetChanged.IsSet, 'Changed state should be true before Pop by design');
+    preCallValue := 123;
+    value := preCallValue;
+    result := funcLazy.Pop(value);
+    Assert.IsTrue(result, 'First Pop should return true by design, even if FProc is nil');
+    Assert.AreEqual(preCallValue, value, 'Value should be unchanged as FProc was nil and current Pop implementation does not assign Default(T)');
+    Assert.IsFalse(funcLazy.GetChanged.IsSet, 'Changed state should be false after Pop');
+end;
+
+// == Tests for TMycFuncLazy<T> - Behavior After Initial Pop ==
+
+procedure TTestMycCoreLazy.TestFuncLazy_AfterFirstPop_IfNoSourceChange_GetChangedIsFalse;
+var
+    funcLazy: IMycLazy<Integer>;
+    sourceDirty: IMycDirty;
+    initialProcValue: Integer;
+begin
+    sourceDirty := TDirty.Construct;
+    sourceDirty.Reset;
+    initialProcValue := 33;
+    funcLazy := TMycFuncLazy<Integer>.Create(sourceDirty.State, function: Integer begin Result := initialProcValue; end);
+    Helper_ConsumeInitialPop(funcLazy, initialProcValue);
+    Assert.IsFalse(funcLazy.GetChanged.IsSet, 'After initial Pop and no source change, GetChanged.IsSet should be false');
+end;
+
+procedure TTestMycCoreLazy.TestFuncLazy_AfterFirstPop_IfNoSourceChange_PopReturnsFalse_ValueUndefined;
+var
+    funcLazy: IMycLazy<Integer>;
+    value: Integer;
+    result: Boolean;
+    sourceDirty: IMycDirty;
+    initialProcValue: Integer;
+    procExecutedCount: Integer;
+begin
+    sourceDirty := TDirty.Construct;
+    sourceDirty.Reset;
+    initialProcValue := 44;
+    procExecutedCount := 0;
+    funcLazy := TMycFuncLazy<Integer>.Create(sourceDirty.State,
+        function: Integer
+        begin
+            Inc(procExecutedCount);
+            Result := initialProcValue;
+        end);
+    Helper_ConsumeInitialPop(funcLazy, initialProcValue);
+    Assert.AreEqual(1, procExecutedCount, 'Proc should have executed once for initial pop');
+    result := funcLazy.Pop(value);
+    Assert.IsFalse(result, 'Second Pop (after initial, no source change) should return false');
+    Assert.AreEqual(1, procExecutedCount, 'Proc should not have executed again');
+end;
+
+procedure TTestMycCoreLazy.TestFuncLazy_AfterSourceChange_GetChanged_IsSet;
+var
+    funcLazy: IMycLazy<Integer>;
+    changedState: IMycState;
+    sourceDirty: IMycDirty;
+    initialProcValue: Integer;
+begin
+    sourceDirty := TDirty.Construct;
+    sourceDirty.Reset;
+    initialProcValue := 20;
+    funcLazy := TMycFuncLazy<Integer>.Create(sourceDirty.State, function: Integer begin Result := initialProcValue; end);
+    Helper_ConsumeInitialPop(funcLazy, initialProcValue);
+    sourceDirty.Notify;
+    changedState := funcLazy.GetChanged;
+    Assert.IsTrue(changedState.IsSet, 'After source change (post-initial pop), funcLazy.GetChanged.IsSet should be true');
+end;
+
+procedure TTestMycCoreLazy.TestFuncLazy_AfterSourceChange_Pop_ReturnsTrueAndProcResult_ResetsChanged;
+var
+    funcLazy: IMycLazy<Integer>;
+    value: Integer;
+    result: Boolean;
+    sourceDirty: IMycDirty;
+    procCallCount: Integer;
+    currentExpectedValue: Integer;
+begin
+    sourceDirty := TDirty.Construct;
+    sourceDirty.Reset;
+    procCallCount := 0;
+    funcLazy := TMycFuncLazy<Integer>.Create(sourceDirty.State,
+        function: Integer
+        begin
+            Inc(procCallCount);
+            if procCallCount = 1 then Result := 30
+            else Result := 300 + procCallCount;
+        end);
+    currentExpectedValue := 30;
+    Helper_ConsumeInitialPop(funcLazy, currentExpectedValue);
+    Assert.AreEqual(1, procCallCount, 'Proc executed for initial Pop');
+    sourceDirty.Notify;
+    Assert.IsTrue(funcLazy.GetChanged.IsSet, 'Changed state should be true after source notification');
+    value := 0;
+    result := funcLazy.Pop(value);
+    currentExpectedValue := 300 + 2;
+    Assert.IsTrue(result, 'Pop should return true after source changed');
+    Assert.AreEqual(2, procCallCount, 'Proc should have been executed again');
+    Assert.AreEqual(currentExpectedValue, value, 'Value should be the new result of FProc');
+    Assert.IsFalse(funcLazy.GetChanged.IsSet, 'Changed state should be false after Pop');
+end;
+
+procedure TTestMycCoreLazy.TestFuncLazy_Pop_Twice_SourceUnchanged_SecondPopReturnsFalse_ValueUndefined;
+var
+    funcLazy: IMycLazy<Integer>;
+    value: Integer;
+    resultPop1, resultPop2: Boolean;
+    sourceDirty: IMycDirty;
+    procCallCount: Integer;
+begin
+    sourceDirty := TDirty.Construct;
+    sourceDirty.Reset;
+    procCallCount := 0;
+    funcLazy := TMycFuncLazy<Integer>.Create(sourceDirty.State,
+        function: Integer
+        begin
+            Inc(procCallCount);
+            Result := 40;
+        end);
+    resultPop1 := funcLazy.Pop(value);
+    Assert.IsTrue(resultPop1, 'First Pop should return true by design');
+    Assert.AreEqual(40, value, 'Value from first Pop');
+    Assert.AreEqual(1, procCallCount, 'Proc called for first Pop');
+    Assert.IsFalse(funcLazy.GetChanged.IsSet, 'Changed state should be false after first Pop');
+    resultPop2 := funcLazy.Pop(value);
+    Assert.IsFalse(resultPop2, 'Second Pop should return false as state was reset and not changed again by source');
+    Assert.AreEqual(1, procCallCount, 'Proc should not be called for second Pop if no source change');
+end;
+
+// TestFuncLazy_SourceChanges_Pop_SourceChangesAgain_PopAgain has been RENAMED and RESTRUCTURED
+// to TestFuncLazy_SourceInteraction_NotifyOnSetSourceDoesNotRetriggerLazy
+procedure TTestMycCoreLazy.TestFuncLazy_SourceInteraction_NotifyOnSetSourceDoesNotRetriggerLazy;
+var
+    funcLazy: IMycLazy<Integer>;
+    value: Integer;
+    result: Boolean;
+    sourceDirty: IMycDirty;
+    procCallCount: Integer;
+    initialValue, firstSourceChangeValue: Integer;
+begin
+    sourceDirty := TDirty.Construct;
+    sourceDirty.Reset; // sourceDirty.IsSet is FALSE
+    procCallCount := 0;
+    initialValue := 51;
+    firstSourceChangeValue := 52;
+
+    funcLazy := TMycFuncLazy<Integer>.Create(sourceDirty.State,
+        function: Integer
+        begin
+            Inc(procCallCount);
+            if procCallCount = 1 then Result := initialValue       // For initial pop
+            else if procCallCount = 2 then Result := firstSourceChangeValue // For pop after first effective source change
+            else Result := 999; // Should not be reached in this specific test logic
+        end);
+
+    // 1. Initial Pop (consumes "by design" changed state)
+    Assert.IsTrue(funcLazy.GetChanged.IsSet, 'Changed state should be true before first Pop (by design)');
+    result := funcLazy.Pop(value); // procCallCount becomes 1
+    Assert.IsTrue(result, 'First Pop should return true');
+    Assert.AreEqual(initialValue, value, 'Value from first Pop');
+    Assert.AreEqual(1, procCallCount, 'Proc called for initial Pop');
+    Assert.IsFalse(funcLazy.GetChanged.IsSet, 'Changed state should be false after first Pop');
+
+    // 2. First effective source change (sourceDirty: false -> true)
+    sourceDirty.Notify; // sourceDirty.IsSet becomes TRUE, notifies funcLazy.FChanged, funcLazy.GetChanged.IsSet becomes TRUE
+    Assert.IsTrue(sourceDirty.State.IsSet, 'sourceDirty should be set after first Notify');
+    Assert.IsTrue(funcLazy.GetChanged.IsSet, 'Changed state should be true after first effective source notification');
+    result := funcLazy.Pop(value); // procCallCount becomes 2
+    Assert.IsTrue(result, 'Pop after first effective source change should return true');
+    Assert.AreEqual(firstSourceChangeValue, value, 'Value from Pop after first effective source change');
+    Assert.AreEqual(2, procCallCount, 'Proc called again');
+    Assert.IsFalse(funcLazy.GetChanged.IsSet, 'Changed state should be false after second Pop');
+
+    // 3. Notify sourceDirty again (sourceDirty is already TRUE)
+    Assert.IsTrue(sourceDirty.State.IsSet, 'sourceDirty is still set before second Notify attempt');
+    sourceDirty.Notify; // Since sourceDirty is already set, this does NOT notify funcLazy.FChanged.
+                        // funcLazy.GetChanged.IsSet remains FALSE.
+
+    Assert.IsFalse(funcLazy.GetChanged.IsSet, 'Changed state should REMAIN false after Notify on an already-set source');
+
+    // 4. Attempt to Pop again
+    result := funcLazy.Pop(value); // procCallCount should remain 2
+    Assert.IsFalse(result, 'Pop after Notify on an already-set source should return false');
+    Assert.AreEqual(2, procCallCount, 'Proc should NOT have been called again');
+    // Value of 'value' is undefined here and not checked.
+end;
+
+procedure TTestMycCoreLazy.TestFuncLazy_Destroy_UnsubscribesFromSource;
+var
+    funcLazyObj: TMycFuncLazy<Integer>;
+    sourceDirty: IMycDirty;
+    tempVal: Integer;
+begin
+    sourceDirty := TDirty.Construct;
+    sourceDirty.Reset;
+    funcLazyObj := TMycFuncLazy<Integer>.Create(sourceDirty.State, function: Integer begin Result := 1; end);
+    Assert.IsTrue(funcLazyObj.Pop(tempVal), 'Initial Pop should succeed');
+    funcLazyObj.Destroy;
+    funcLazyObj := nil;
+    Assert.WillNotRaise(
+        procedure
+        begin
+            sourceDirty.Notify;
+        end,
+        nil,
+        'Destroy test assumes TMycSubscription.Unsubscribe works. Verified by no crash on source notify post-destroy.');
+    sourceDirty := nil;
+end;
+
+procedure TTestMycCoreLazy.TestFuncLazy_SourceIsInitiallySet_PopBehavesCorrectly;
+var
+    funcLazy: IMycLazy<Integer>;
+    value: Integer;
+    result: Boolean;
+    sourceDirty: IMycDirty;
+    expectedValue: Integer;
+    procExecuted: Boolean;
+begin
+    sourceDirty := TDirty.Construct;
+    Assert.IsTrue(sourceDirty.State.IsSet, 'SourceDirty should be initially set for this test scenario');
+    expectedValue := 70;
+    procExecuted := False;
+    funcLazy := TMycFuncLazy<Integer>.Create(sourceDirty.State,
+        function: Integer
+        begin
+            procExecuted := True;
+            Result := expectedValue;
+        end);
+    Assert.IsNotNull(funcLazy, 'TMycFuncLazy<Integer> instance should not be nil');
+    Assert.IsTrue(funcLazy.GetChanged.IsSet, 'funcLazy.GetChanged.IsSet should be true after creation (by design)');
+    value := 0;
+    result := funcLazy.Pop(value);
+    Assert.IsTrue(result, 'First Pop should return true');
+    Assert.IsTrue(procExecuted, 'FProc should have been executed on first Pop');
+    Assert.AreEqual(expectedValue, value, 'Value should be the result of FProc');
+    Assert.IsFalse(funcLazy.GetChanged.IsSet, 'Changed state should be false after the first Pop');
+end;
+
+initialization
+    TDUnitX.RegisterTestFixture(TTestMycCoreLazy);
+end.

Src/Myc.Test.Lazy.pas

@@ -0,0 +1,460 @@
+unit Myc.Test.Lazy;
+
+interface
+
+uses
+    System.SysUtils,
+    DUnitX.TestFramework,
+    Myc.Signals,   // For IMycState, TState, IMycDirty
+    Myc.Lazy;      // The unit under test
+
+type
+    [TestFixture]
+    TTestMyLazy = class(TObject)
+    private
+        FChangingSignal: IMycDirty; // Used as the 'Changing' state for functional lazy objects
+
+        // Helper to consume the initial pop, which is always expected to succeed
+        // for a TLazy wrapping a functional lazy object due to "Changed.IsSet initially true" design.
+        procedure ConsumeInitialPop(var ALazyRec: TLazy<Integer>; ExpectedInitialValue: Integer; const MsgPrefix: string);
+    public
+        [Setup]
+        procedure Setup;
+        [TearDown]
+        procedure TearDown;
+
+        // Tests for TLazy<T>.Create(nil) - Null Object Pattern
+        [Test]
+        procedure TestCreateWithNil_Changed_IsAlwaysTrue;
+        [Test]
+        procedure TestCreateWithNil_Pop_ReturnsTrueAndDefaultInteger;
+        [Test]
+        procedure TestCreateWithNil_Pop_ReturnsTrueAndDefaultString;
+
+        // Tests for TLazy<T>.Construct (creates a functional lazy object)
+        [Test]
+        procedure TestConstruct_InitialChanged_IsAlwaysTrue;
+        [Test]
+        procedure TestConstruct_FirstPop_SucceedsAndResetsChanged;
+        [Test]
+        procedure TestConstruct_WithNilProc_FirstPopReturnsTrueAndValueUnchanged;
+        [Test]
+        procedure TestConstruct_StateInteraction_SignalTriggersChanged;
+        [Test]
+        procedure TestConstruct_StateInteraction_PopResetsChangedAfterSignal;
+        [Test]
+        procedure TestConstruct_StateInteraction_NotifyOnAlreadySetSource_DoesNotRetrigger;
+        [Test]
+        procedure TestConstruct_Destruction_UnsubscribesAndNoCrashOnSourceNotify;
+
+        // Tests for TLazy<T>.Create with a pre-existing (non-nil) IMycLazy
+        [Test]
+        procedure TestCreateWithExistingLazy_DelegatesChangedCorrectly;
+        [Test]
+        procedure TestCreateWithExistingLazy_DelegatesPopCorrectly;
+
+        // Tests for TLazy<T> implicit operators
+        [Test]
+        procedure TestImplicitOperator_FromInterfaceToRecord;
+        [Test]
+        procedure TestImplicitOperator_FromRecordToInterface;
+
+        // Tests for TLazy<T>.Pop specific behaviors (Res undefined)
+        [Test]
+        procedure TestPop_AfterInitialAndNoSignal_ReturnsFalseAndResUndefined;
+
+    end;
+
+implementation
+
+// No direct uses of Myc.Core.* units here
+
+{ TTestMyLazy }
+
+procedure TTestMyLazy.Setup;
+begin
+    // Create a common signal source for tests that need it.
+    // TState.CreateDirty is from Myc.Signals.pas (interface part)
+    // Its implementation might rely on Myc.Core.Signals, but that's an indirect usage.
+    FChangingSignal := TDirty.Construct;
+    FChangingSignal.Reset; // Start with a clean (not set) signal for predictable test starts
+end;
+
+procedure TTestMyLazy.TearDown;
+begin
+    FChangingSignal := nil; // Release the common signal source
+end;
+
+procedure TTestMyLazy.ConsumeInitialPop(var ALazyRec: TLazy<Integer>; ExpectedInitialValue: Integer; const MsgPrefix: string);
+var
+    val: Integer;
+    popResult: Boolean;
+begin
+    Assert.IsTrue(ALazyRec.Changed.IsSet, MsgPrefix + ': Changed.IsSet should be true before initial Pop');
+    popResult := ALazyRec.Pop(val);
+    Assert.IsTrue(popResult, MsgPrefix + ': Initial Pop should return true');
+    Assert.AreEqual(ExpectedInitialValue, val, MsgPrefix + ': Value from initial Pop mismatch');
+    Assert.IsFalse(ALazyRec.Changed.IsSet, MsgPrefix + ': Changed.IsSet should be false after initial Pop');
+end;
+
+// == Tests for TLazy<T>.Create(nil) - Null Object Pattern ==
+
+procedure TTestMyLazy.TestCreateWithNil_Changed_IsAlwaysTrue;
+var
+    lazyRec: TLazy<Integer>;
+begin
+    lazyRec := TLazy<Integer>.Create(nil); // This uses the internal FNull (TMycNullLazy)
+    Assert.IsTrue(lazyRec.Changed.IsSet, 'For TLazy created with nil, Changed.IsSet should be true (TMycNullLazy behavior)');
+    // Second check to ensure it's consistently true
+    Assert.IsTrue(lazyRec.Changed.IsSet, 'For TLazy created with nil, Changed.IsSet should remain true');
+end;
+
+procedure TTestMyLazy.TestCreateWithNil_Pop_ReturnsTrueAndDefaultInteger;
+var
+    lazyRec: TLazy<Integer>;
+    val: Integer;
+    popResult: Boolean;
+begin
+    lazyRec := TLazy<Integer>.Create(nil);
+    val := 12345; // Pre-assign to check if Pop overwrites it with Default
+    popResult := lazyRec.Pop(val);
+    Assert.IsTrue(popResult, 'Pop on TLazy created with nil should return true');
+    Assert.AreEqual(Default(Integer), val, 'Pop on TLazy created with nil should set Res to Default(Integer)');
+end;
+
+procedure TTestMyLazy.TestCreateWithNil_Pop_ReturnsTrueAndDefaultString;
+var
+    lazyRec: TLazy<string>;
+    val: string;
+    popResult: Boolean;
+begin
+    lazyRec := TLazy<string>.Create(nil);
+    val := 'test'; // Pre-assign
+    popResult := lazyRec.Pop(val);
+    Assert.IsTrue(popResult, 'Pop on TLazy created with nil (string) should return true');
+    Assert.AreEqual(Default(string), val, 'Pop on TLazy created with nil (string) should set Res to Default(string)');
+end;
+
+// == Tests for TLazy<T>.Construct static method ==
+
+procedure TTestMyLazy.TestConstruct_InitialChanged_IsAlwaysTrue;
+var
+    lazyIntf: IMycLazy<Integer>;
+    lazyRec: TLazy<Integer>;
+    procExecuted: Boolean;
+begin
+    procExecuted := False;
+    // FChangingSignal is reset in Setup
+    lazyIntf := TLazy<Integer>.Construct(FChangingSignal.State,
+        function: Integer
+        begin
+            procExecuted := True;
+            Result := 10;
+        end);
+    Assert.IsNotNull(lazyIntf, 'TLazy.Construct should return a valid interface');
+
+    lazyRec := lazyIntf; // Implicit conversion
+    Assert.IsTrue(lazyRec.Changed.IsSet, 'Constructed lazy object: Initial Changed.IsSet should be true by design');
+    Assert.IsFalse(procExecuted, 'Proc should not have been executed by Construct or by checking Changed state');
+end;
+
+procedure TTestMyLazy.TestConstruct_FirstPop_SucceedsAndResetsChanged;
+var
+    lazyIntf: IMycLazy<Integer>;
+    lazyRec: TLazy<Integer>;
+    procExecuted: Boolean;
+    expectedValue: Integer;
+begin
+    procExecuted := False;
+    expectedValue := 20;
+    lazyIntf := TLazy<Integer>.Construct(FChangingSignal.State,
+        function: Integer
+        begin
+            procExecuted := True;
+            Result := expectedValue;
+        end);
+    lazyRec := lazyIntf;
+
+    ConsumeInitialPop(lazyRec, expectedValue, 'TestConstruct_FirstPop');
+    Assert.IsTrue(procExecuted, 'Proc should have been executed by the initial Pop');
+end;
+
+procedure TTestMyLazy.TestConstruct_WithNilProc_FirstPopReturnsTrueAndValueUnchanged;
+var
+    lazyIntf: IMycLazy<Integer>;
+    lazyRec: TLazy<Integer>;
+    val: Integer;
+    preVal: Integer;
+    popResult: Boolean;
+begin
+    lazyIntf := TLazy<Integer>.Construct(FChangingSignal.State, nil); // Proc is nil
+    lazyRec := lazyIntf;
+
+    Assert.IsTrue(lazyRec.Changed.IsSet, 'Constructed lazy (nil Proc): Initial Changed.IsSet should be true');
+    preVal := 77;
+    val := preVal;
+    popResult := lazyRec.Pop(val);
+
+    Assert.IsTrue(popResult, 'Constructed lazy (nil Proc): First Pop should return true');
+    // As per TMycFuncLazy behavior, if FProc is nil, Pop does not assign Default(T) to Res,
+    // Res remains unchanged.
+    Assert.AreEqual(preVal, val, 'Constructed lazy (nil Proc): Res should be unchanged by Pop as Proc was nil');
+    Assert.IsFalse(lazyRec.Changed.IsSet, 'Constructed lazy (nil Proc): Changed.IsSet should be false after Pop');
+end;
+
+procedure TTestMyLazy.TestConstruct_StateInteraction_SignalTriggersChanged;
+var
+    lazyIntf: IMycLazy<Integer>;
+    lazyRec: TLazy<Integer>;
+    expectedValue: Integer;
+begin
+    expectedValue := 30;
+    lazyIntf := TLazy<Integer>.Construct(FChangingSignal.State, function: Integer begin Result := expectedValue; end);
+    lazyRec := lazyIntf;
+
+    ConsumeInitialPop(lazyRec, expectedValue, 'TestConstruct_StateInteraction_SignalTriggersChanged (Initial)');
+    Assert.IsFalse(lazyRec.Changed.IsSet, 'After initial Pop, Changed.IsSet should be false');
+
+    FChangingSignal.Notify; // Trigger the source signal
+
+    Assert.IsTrue(lazyRec.Changed.IsSet, 'After source signal Notify, Changed.IsSet should become true');
+end;
+
+procedure TTestMyLazy.TestConstruct_StateInteraction_PopResetsChangedAfterSignal;
+var
+    lazyIntf: IMycLazy<Integer>;
+    lazyRec: TLazy<Integer>;
+    val: Integer;
+    popResult: Boolean;
+    procCallCount: Integer;
+begin
+    procCallCount := 0;
+    lazyIntf := TLazy<Integer>.Construct(FChangingSignal.State,
+        function: Integer
+        begin
+            Inc(procCallCount);
+            Result := 100 + procCallCount; // Value changes per call
+        end);
+    lazyRec := lazyIntf;
+
+    ConsumeInitialPop(lazyRec, 101, 'TestConstruct_StateInteraction_PopResetsChangedAfterSignal (Initial)'); // procCallCount = 1
+    FChangingSignal.Notify;
+    Assert.IsTrue(lazyRec.Changed.IsSet, 'Changed.IsSet should be true after signal');
+
+    popResult := lazyRec.Pop(val); // procCallCount = 2
+    Assert.IsTrue(popResult, 'Pop after signal should return true');
+    Assert.AreEqual(102, val, 'Value from Pop after signal mismatch');
+    Assert.AreEqual(2, procCallCount, 'Proc call count after second pop mismatch');
+    Assert.IsFalse(lazyRec.Changed.IsSet, 'Changed.IsSet should be false after Pop following signal');
+end;
+
+procedure TTestMyLazy.TestConstruct_StateInteraction_NotifyOnAlreadySetSource_DoesNotRetrigger;
+var
+    lazyIntf: IMycLazy<Integer>;
+    lazyRec: TLazy<Integer>;
+    val: Integer;
+    popResult: Boolean;
+    procCallCount: Integer;
+begin
+    procCallCount := 0;
+    lazyIntf := TLazy<Integer>.Construct(FChangingSignal.State,
+        function: Integer
+        begin
+            Inc(procCallCount);
+            Result := 200 + procCallCount;
+        end);
+    lazyRec := lazyIntf;
+
+    // 1. Initial Pop
+    ConsumeInitialPop(lazyRec, 201, 'TestConstruct_NotifyOnAlreadySetSource (Initial)'); // procCallCount = 1
+    Assert.IsFalse(FChangingSignal.State.IsSet, 'Source signal FChangingSignal should still be false (was reset in Setup)');
+
+    // 2. Trigger source, make it set, Pop
+    FChangingSignal.Notify; // FChangingSignal.IsSet becomes TRUE
+    Assert.IsTrue(lazyRec.Changed.IsSet, 'Lazy state should be true after FChangingSignal.Notify');
+    popResult := lazyRec.Pop(val); // procCallCount = 2
+    Assert.IsTrue(popResult);
+    Assert.AreEqual(202, val);
+    Assert.IsFalse(lazyRec.Changed.IsSet, 'Lazy state should be false after second Pop');
+
+    // 3. Notify FChangingSignal again. It's already set.
+    //    This should NOT re-notify subscribers (like the lazy object's internal trigger)
+    //    because TMycDirty only notifies on a false -> true transition.
+    Assert.IsTrue(FChangingSignal.State.IsSet, 'FChangingSignal should still be true before redundant Notify');
+    FChangingSignal.Notify;
+
+    Assert.IsFalse(lazyRec.Changed.IsSet, 'Lazy state should REMAIN false after Notify on an already-set source');
+
+    // 4. Attempt to Pop again
+    popResult := lazyRec.Pop(val); // procCallCount should remain 2
+    Assert.IsFalse(popResult, 'Pop after Notify on an already-set source should return false');
+    Assert.AreEqual(2, procCallCount, 'Proc should not have been called for this Pop');
+end;
+
+procedure TTestMyLazy.TestConstruct_Destruction_UnsubscribesAndNoCrashOnSourceNotify;
+var
+    lazyIntf: IMycLazy<Integer>;
+    localChangingSignal: IMycDirty; // Use a local signal for this test to control its lifetime
+begin
+    localChangingSignal := TDirty.Construct;
+    localChangingSignal.Reset;
+
+    lazyIntf := TLazy<Integer>.Construct(localChangingSignal.State, function: Integer begin Result := 1; end);
+    Assert.IsNotNull(lazyIntf, 'Constructed lazy interface should not be nil');
+
+    // Simulate usage and release of the lazy object
+    var lazyRec: TLazy<Integer> := lazyIntf; // Wrap for initial pop
+    ConsumeInitialPop(lazyRec, 1, 'TestConstruct_Destruction (Initial)');
+
+    lazyIntf := nil; // Release the IMycLazy interface. ARC should destroy the TMycFuncLazy object.
+                     // This should trigger its destructor, which should unsubscribe from localChangingSignal.
+
+    Assert.WillNotRaise(
+        procedure
+        begin
+            localChangingSignal.Notify; // Notify the source AFTER the lazy object is supposed to be gone.
+        end,
+        nil, // Default: any exception is a failure
+        'Notifying source after lazy object is freed should not crash, indicating unsubscription.');
+
+    localChangingSignal := nil; // Clean up the local signal itself.
+end;
+
+
+// == Tests for TLazy<T>.Create with a pre-existing (non-nil) IMycLazy ==
+
+procedure TTestMyLazy.TestCreateWithExistingLazy_DelegatesChangedCorrectly;
+var
+    originalLazyIntf: IMycLazy<Integer>;
+    wrappedLazyRec: TLazy<Integer>;
+    expectedValue: Integer;
+begin
+    expectedValue := 60;
+    originalLazyIntf := TLazy<Integer>.Construct(FChangingSignal.State, function: Integer begin Result := expectedValue; end);
+    // originalLazyIntf.Changed.IsSet is true by design
+
+    wrappedLazyRec := TLazy<Integer>.Create(originalLazyIntf);
+    Assert.IsTrue(wrappedLazyRec.Changed.IsSet, 'Wrapped lazy: Changed.IsSet should reflect original (initially true)');
+
+    ConsumeInitialPop(wrappedLazyRec, expectedValue, 'TestCreateWithExistingLazy_DelegatesChangedCorrectly (Initial)');
+    // Now wrappedLazyRec.Changed.IsSet is false, and so should originalLazyIntf.Changed.IsSet
+
+    Assert.IsFalse(originalLazyIntf.Changed.IsSet, 'Original lazy: Changed.IsSet should also be false after wrapped Pop');
+
+    FChangingSignal.Notify;
+    Assert.IsTrue(wrappedLazyRec.Changed.IsSet, 'Wrapped lazy: Changed.IsSet should be true after source signal');
+    Assert.IsTrue(originalLazyIntf.Changed.IsSet, 'Original lazy: Changed.IsSet should also be true after source signal');
+end;
+
+procedure TTestMyLazy.TestCreateWithExistingLazy_DelegatesPopCorrectly;
+var
+    originalLazyIntf: IMycLazy<Integer>;
+    wrappedLazyRec: TLazy<Integer>;
+    val: Integer;
+    popResult: Boolean;
+    procCallCount: Integer;
+begin
+    procCallCount := 0;
+    originalLazyIntf := TLazy<Integer>.Construct(FChangingSignal.State,
+        function: Integer
+        begin
+            Inc(procCallCount);
+            Result := 70 + procCallCount;
+        end);
+    wrappedLazyRec := TLazy<Integer>.Create(originalLazyIntf);
+
+    // First Pop via wrapper (initial pop)
+    ConsumeInitialPop(wrappedLazyRec, 71, 'TestCreateWithExistingLazy_DelegatesPopCorrectly (Initial)'); // procCallCount = 1
+    Assert.AreEqual(1, procCallCount, 'Proc call count after wrapped initial Pop');
+
+    // Second Pop via wrapper (no source change yet)
+    popResult := wrappedLazyRec.Pop(val);
+    Assert.IsFalse(popResult, 'Second Pop via wrapper (no source change) should return false');
+    Assert.AreEqual(1, procCallCount, 'Proc call count should not change');
+
+    // Trigger source, Pop via wrapper
+    FChangingSignal.Notify;
+    Assert.IsTrue(wrappedLazyRec.Changed.IsSet, 'Wrapped lazy: Changed.IsSet true after source signal');
+    popResult := wrappedLazyRec.Pop(val); // procCallCount = 2
+    Assert.IsTrue(popResult, 'Pop via wrapper after source signal should return true');
+    Assert.AreEqual(72, val, 'Value from Pop via wrapper after signal');
+    Assert.AreEqual(2, procCallCount, 'Proc call count after signal and Pop');
+    Assert.IsFalse(wrappedLazyRec.Changed.IsSet, 'Wrapped lazy: Changed.IsSet false after Pop');
+end;
+
+// == Tests for TLazy<T> implicit operators ==
+
+procedure TTestMyLazy.TestImplicitOperator_FromInterfaceToRecord;
+var
+    lazyIntf: IMycLazy<Integer>;
+    lazyRec: TLazy<Integer>;
+    expectedValue: Integer;
+begin
+    expectedValue := 80;
+    lazyIntf := TLazy<Integer>.Construct(FChangingSignal.State, function: Integer begin Result := expectedValue; end);
+    Assert.IsNotNull(lazyIntf, 'Interface should be assigned');
+
+    lazyRec := lazyIntf; // Implicit conversion: IMycLazy<T> to TLazy<T>
+
+    // Verify by using the record
+    Assert.IsTrue(lazyRec.Changed.IsSet, 'Record (from intf): Initial Changed.IsSet should be true');
+    ConsumeInitialPop(lazyRec, expectedValue, 'TestImplicitOperator_FromInterfaceToRecord');
+end;
+
+procedure TTestMyLazy.TestImplicitOperator_FromRecordToInterface;
+var
+    lazyIntfFromConstruct: IMycLazy<Integer>;
+    lazyRec: TLazy<Integer>;
+    lazyIntfFromRecord: IMycLazy<Integer>;
+    val: Integer;
+    expectedValue: Integer;
+begin
+    expectedValue := 90;
+    lazyIntfFromConstruct := TLazy<Integer>.Construct(FChangingSignal.State, function: Integer begin Result := expectedValue; end);
+    lazyRec.Create(lazyIntfFromConstruct); // Explicitly create record
+
+    lazyIntfFromRecord := lazyRec; // Implicit conversion: TLazy<T> to IMycLazy<T>
+
+    // Verify by using the converted interface
+    Assert.AreSame(lazyIntfFromConstruct, lazyIntfFromRecord, 'Converted interface should be the same as the original wrapped one');
+    Assert.IsTrue(lazyIntfFromRecord.Changed.IsSet, 'Interface (from rec): Initial Changed.IsSet should be true');
+    var popResult := lazyIntfFromRecord.Pop(val); // This also tests if the interface is functional
+    Assert.IsTrue(popResult);
+    Assert.AreEqual(expectedValue, val);
+    Assert.IsFalse(lazyIntfFromRecord.Changed.IsSet);
+end;
+
+// == Tests for TLazy<T>.Pop specific behaviors (Res undefined) ==
+procedure TTestMyLazy.TestPop_AfterInitialAndNoSignal_ReturnsFalseAndResUndefined;
+var
+    lazyIntf: IMycLazy<Integer>;
+    lazyRec: TLazy<Integer>;
+    val: Integer; // Value will not be checked as Pop returns false
+    popResult: Boolean;
+    procExecuted: Boolean;
+begin
+    procExecuted := False;
+    lazyIntf := TLazy<Integer>.Construct(FChangingSignal.State,
+      function: Integer
+      begin
+          procExecuted := True;
+          Result := 100;
+      end);
+    lazyRec := lazyIntf;
+
+    ConsumeInitialPop(lazyRec, 100, 'TestPop_AfterInitialAndNoSignal (Initial)');
+    Assert.IsTrue(procExecuted, 'Proc should have run for initial pop');
+    procExecuted := False; // Reset for next check
+
+    // FChangingSignal has not been notified again
+    Assert.IsFalse(lazyRec.Changed.IsSet, 'Changed.IsSet must be false before this Pop attempt');
+    popResult := lazyRec.Pop(val);
+
+    Assert.IsFalse(popResult, 'Pop when Changed.IsSet is false should return false');
+    Assert.IsFalse(procExecuted, 'Proc should NOT have run as Pop returned false');
+    // Do NOT check 'val' as its content is undefined when Pop returns false.
+end;
+
+initialization
+    TDUnitX.RegisterTestFixture(TTestMyLazy);
+end.

Test/MycTests.dpr

@@ -28,7 +28,11 @@ uses
   Myc.TaskManager in '..\Src\Myc.TaskManager.pas',
   Myc.Core.Futures in '..\Src\Myc.Core.Futures.pas',
   Myc.Core.Signals in '..\Src\Myc.Core.Signals.pas',
-  TestFutures in 'TestFutures.pas';
+  TestFutures in 'TestFutures.pas',
+  Myc.Lazy in '..\Src\Myc.Lazy.pas',
+  Myc.Core.Lazy in '..\Src\Myc.Core.Lazy.pas',
+  Myc.Test.Core.Lazy in '..\Src\Myc.Test.Core.Lazy.pas',
+  Myc.Test.Lazy in '..\Src\Myc.Test.Lazy.pas';
 
 { keep comment here to protect the following conditional from being removed by the IDE when adding a unit }
 {$IFNDEF TESTINSIGHT}

Test/MycTests.dproj

@@ -64,9 +64,9 @@
         <VerInfo_Keys>CompanyName=;FileDescription=$(MSBuildProjectName);FileVersion=1.0.0.0;InternalName=;LegalCopyright=;LegalTrademarks=;OriginalFilename=;ProgramID=com.embarcadero.$(MSBuildProjectName);ProductName=$(MSBuildProjectName);ProductVersion=1.0.0.0;Comments=</VerInfo_Keys>
         <Debugger_RunParams>--exitbehavior:Pause</Debugger_RunParams>
         <DCC_Define>TESTINSIGHT;$(DCC_Define)</DCC_Define>
-        <PostBuildEvent><![CDATA[T:\DelphiIntfExtract\Win64\Debug\ExtractPascalInterfaces.exe -o T:\Myc\intf.txt T:\Myc\src
-$(PostBuildEvent)]]></PostBuildEvent>
         <PostBuildEventExecuteWhen>TargetOutOfDate</PostBuildEventExecuteWhen>
+        <PreBuildEvent><![CDATA[T:\DelphiIntfExtract\Win64\Debug\ExtractPascalInterfaces.exe -o T:\Myc\intf.txt T:\Myc\src
+$(PreBuildEvent)]]></PreBuildEvent>
     </PropertyGroup>
     <PropertyGroup Condition="'$(Base_Win32)'!=''">
         <DCC_UsePackage>vclwinx;fmx;vclie;DbxCommonDriver;bindengine;IndyIPCommon;VCLRESTComponents;FireDACCommonODBC;FireDACCommonDriver;IndyProtocols;vclx;Skia.Package.RTL;IndyIPClient;dbxcds;vcledge;bindcompvclwinx;FmxTeeUI;bindcompfmx;inetdb;FireDACSqliteDriver;DbxClientDriver;Tee;soapmidas;vclactnband;TeeUI;fmxFireDAC;dbexpress;DBXMySQLDriver;VclSmp;inet;vcltouch;fmxase;dbrtl;Skia.Package.FMX;fmxdae;TeeDB;FireDACMSAccDriver;CustomIPTransport;vcldsnap;DBXInterBaseDriver;IndySystem;Skia.Package.VCL;vcldb;vclFireDAC;bindcomp;FireDACCommon;inetstn;IndyCore;RESTBackendComponents;bindcompdbx;rtl;FireDACMySQLDriver;FireDACADSDriver;RESTComponents;DBXSqliteDriver;vcl;IndyIPServer;dsnapxml;dsnapcon;adortl;vclimg;FireDACPgDriver;FireDAC;inetdbxpress;xmlrtl;tethering;bindcompvcl;dsnap;CloudService;fmxobj;bindcompvclsmp;FMXTee;soaprtl;soapserver;FireDACIBDriver;$(DCC_UsePackage)</DCC_UsePackage>
@@ -128,6 +128,10 @@ $(PostBuildEvent)]]></PostBuildEvent>
         <DCCReference Include="..\Src\Myc.Core.Futures.pas"/>
         <DCCReference Include="..\Src\Myc.Core.Signals.pas"/>
         <DCCReference Include="TestFutures.pas"/>
+        <DCCReference Include="..\Src\Myc.Lazy.pas"/>
+        <DCCReference Include="..\Src\Myc.Core.Lazy.pas"/>
+        <DCCReference Include="..\Src\Myc.Test.Core.Lazy.pas"/>
+        <DCCReference Include="..\Src\Myc.Test.Lazy.pas"/>
         <BuildConfiguration Include="Base">
             <Key>Base</Key>
         </BuildConfiguration>
@@ -1149,35 +1153,35 @@ $(PostBuildEvent)]]></PostBuildEvent>
     <Import Project="$(APPDATA)\Embarcadero\$(BDSAPPDATABASEDIR)\$(PRODUCTVERSION)\UserTools.proj" Condition="Exists('$(APPDATA)\Embarcadero\$(BDSAPPDATABASEDIR)\$(PRODUCTVERSION)\UserTools.proj')"/>
     <Import Project="$(MSBuildProjectName).deployproj" Condition="Exists('$(MSBuildProjectName).deployproj')"/>
     <PropertyGroup Condition="'$(Config)'=='Debug' And '$(Platform)'=='Win32'">
-        <PreBuildEvent/>
+        <PreBuildEvent>T:\DelphiIntfExtract\Win64\Debug\ExtractPascalInterfaces.exe -o T:\Myc\intf.txt T:\Myc\src</PreBuildEvent>
         <PreBuildEventIgnoreExitCode>False</PreBuildEventIgnoreExitCode>
         <PreLinkEvent/>
         <PreLinkEventIgnoreExitCode>False</PreLinkEventIgnoreExitCode>
-        <PostBuildEvent>T:\DelphiIntfExtract\Win64\Debug\ExtractPascalInterfaces.exe -o T:\Myc\intf.txt T:\Myc\src</PostBuildEvent>
+        <PostBuildEvent/>
         <PostBuildEventIgnoreExitCode>False</PostBuildEventIgnoreExitCode>
     </PropertyGroup>
     <PropertyGroup Condition="'$(Config)'=='Debug' And '$(Platform)'=='Win64'">
-        <PreBuildEvent/>
+        <PreBuildEvent>T:\DelphiIntfExtract\Win64\Debug\ExtractPascalInterfaces.exe -o T:\Myc\intf.txt T:\Myc\src</PreBuildEvent>
         <PreBuildEventIgnoreExitCode>False</PreBuildEventIgnoreExitCode>
         <PreLinkEvent/>
         <PreLinkEventIgnoreExitCode>False</PreLinkEventIgnoreExitCode>
-        <PostBuildEvent>T:\DelphiIntfExtract\Win64\Debug\ExtractPascalInterfaces.exe -o T:\Myc\intf.txt T:\Myc\src</PostBuildEvent>
+        <PostBuildEvent/>
         <PostBuildEventIgnoreExitCode>False</PostBuildEventIgnoreExitCode>
     </PropertyGroup>
     <PropertyGroup Condition="'$(Config)'=='Release' And '$(Platform)'=='Win32'">
-        <PreBuildEvent/>
+        <PreBuildEvent>T:\DelphiIntfExtract\Win64\Debug\ExtractPascalInterfaces.exe -o T:\Myc\intf.txt T:\Myc\src</PreBuildEvent>
         <PreBuildEventIgnoreExitCode>False</PreBuildEventIgnoreExitCode>
         <PreLinkEvent/>
         <PreLinkEventIgnoreExitCode>False</PreLinkEventIgnoreExitCode>
-        <PostBuildEvent>T:\DelphiIntfExtract\Win64\Debug\ExtractPascalInterfaces.exe -o T:\Myc\intf.txt T:\Myc\src</PostBuildEvent>
+        <PostBuildEvent/>
         <PostBuildEventIgnoreExitCode>False</PostBuildEventIgnoreExitCode>
     </PropertyGroup>
     <PropertyGroup Condition="'$(Config)'=='Release' And '$(Platform)'=='Win64'">
-        <PreBuildEvent/>
+        <PreBuildEvent>T:\DelphiIntfExtract\Win64\Debug\ExtractPascalInterfaces.exe -o T:\Myc\intf.txt T:\Myc\src</PreBuildEvent>
         <PreBuildEventIgnoreExitCode>False</PreBuildEventIgnoreExitCode>
         <PreLinkEvent/>
         <PreLinkEventIgnoreExitCode>False</PreLinkEventIgnoreExitCode>
-        <PostBuildEvent>T:\DelphiIntfExtract\Win64\Debug\ExtractPascalInterfaces.exe -o T:\Myc\intf.txt T:\Myc\src</PostBuildEvent>
+        <PostBuildEvent/>
         <PostBuildEventIgnoreExitCode>False</PostBuildEventIgnoreExitCode>
     </PropertyGroup>
 </Project>

Test/TestCoreFutures.pas

@@ -23,7 +23,7 @@ type
 
   [TestFixture]
   [IgnoreMemoryLeaks(true)]
-  TTestMycInitStateFuncFuture = class(TObject)
+  TTestMycGateFuncFuture = class(TObject)
   private
     FTaskFactory: IMycTaskFactory;
     FProcExecutionCount: Integer; // Counter for side effects of AProc
@@ -67,16 +67,16 @@ begin
   Result := False; // This subscriber is typically one-shot for this purpose.
 end;
 
-{ TTestMycInitStateFuncFuture }
+{ TTestMycGateFuncFuture }
 
-procedure TTestMycInitStateFuncFuture.Setup;
+procedure TTestMycGateFuncFuture.Setup;
 begin
   FTaskFactory := TMycTaskFactory.Create; // Create a new task factory instance for each test [cite: 113, 235, 353]
   FProcExecutionCount := 0;
   FSharedCounter := 0;
 end;
 
-procedure TTestMycInitStateFuncFuture.TearDown;
+procedure TTestMycGateFuncFuture.TearDown;
 begin
   if Assigned(FTaskFactory) then
   begin
@@ -85,7 +85,7 @@ begin
   end;
 end;
 
-procedure TTestMycInitStateFuncFuture.Test_BasicSuccess_WithImmediateInitState;
+procedure TTestMycGateFuncFuture.Test_BasicSuccess_WithImmediateInitState;
 var
   LFuture: IMycFuture<Integer>;
   LInitStateAsState: IMycState; // Parameter for Create
@@ -96,7 +96,7 @@ begin
   // Use TMycLatch.Null for an already set init state [cite: 71, 81, 206, 216, 324, 334]
   LInitStateAsState := TState.Null;
 
-  LFuture := TMycInitStateFuncFuture<Integer>.Create(FTaskFactory, LInitStateAsState,
+  LFuture := TMycGateFuncFuture<Integer>.Create(FTaskFactory, LInitStateAsState,
     function: Integer
     begin
       Inc(Self.FProcExecutionCount);
@@ -112,7 +112,7 @@ begin
   Assert.AreEqual(CExpectedResult, LResultValue, 'GetResult returned an unexpected value.');
 end;
 
-procedure TTestMycInitStateFuncFuture.Test_ChainedExecution_WithDelayedInitState;
+procedure TTestMycGateFuncFuture.Test_ChainedExecution_WithDelayedInitState;
 var
   LFuture: IMycFuture<string>;
   LInitLatch: IMycLatch;
@@ -120,9 +120,9 @@ var
 const
   CExpectedResult = 'ChainCompleted';
 begin
-  LInitLatch := TState.CreateLatch(1); // Create an init state that is not yet set [cite: 77, 212, 330]
+  LInitLatch := TLatch.Construct(1); // Create an init state that is not yet set [cite: 77, 212, 330]
 
-  LFuture := TMycInitStateFuncFuture<string>.Create(FTaskFactory, LInitLatch.State,
+  LFuture := TMycGateFuncFuture<string>.Create(FTaskFactory, LInitLatch.State,
     function: string
     begin
       Inc(Self.FProcExecutionCount);
@@ -143,7 +143,7 @@ begin
   Assert.AreEqual(CExpectedResult, LResultValue, 'GetResult returned an unexpected value after delayed init.');
 end;
 
-procedure TTestMycInitStateFuncFuture.Test_ExceptionInProc_HandledAsPlanned;
+procedure TTestMycGateFuncFuture.Test_ExceptionInProc_HandledAsPlanned;
 var
   LFuture: IMycFuture<Integer>;
   LLocalTaskFactory: IMycTaskFactory;
@@ -157,7 +157,7 @@ begin
   LLocalTaskFactory := TMycTaskFactory.Create;
   LInitStateAsState := TState.Null; // Immediate execution
 
-  LFuture := TMycInitStateFuncFuture<Integer>.Create(LLocalTaskFactory, LInitStateAsState,
+  LFuture := TMycGateFuncFuture<Integer>.Create(LLocalTaskFactory, LInitStateAsState,
     function: Integer
     begin
       Inc(Self.FProcExecutionCount);
@@ -203,14 +203,14 @@ begin
   end;
 end;
 
-procedure TTestMycInitStateFuncFuture.Test_GetResult_BeforeDone_RaisesException;
+procedure TTestMycGateFuncFuture.Test_GetResult_BeforeDone_RaisesException;
 var
   LFuture: IMycFuture<Integer>;
   LInitLatch: IMycLatch;
 begin
-  LInitLatch := TState.CreateLatch(1);
+  LInitLatch := TLatch.Construct(1);
 
-  LFuture := TMycInitStateFuncFuture<Integer>.Create(FTaskFactory, LInitLatch.State,
+  LFuture := TMycGateFuncFuture<Integer>.Create(FTaskFactory, LInitLatch.State,
     function: Integer
     begin
       Inc(Self.FProcExecutionCount);
@@ -236,7 +236,7 @@ begin
     end );
 end;
 
-procedure TTestMycInitStateFuncFuture.Test_FanIn_OneFutureWaitsForMultipleOthers;
+procedure TTestMycGateFuncFuture.Test_FanIn_OneFutureWaitsForMultipleOthers;
 var
   LPrerequisiteFuture1, LPrerequisiteFuture2: IMycFuture<Integer>;
   LMainFuture: IMycFuture<string>;
@@ -250,10 +250,10 @@ begin
   FProcExecutionCount := 0; // Reset for this test
 
   // Gate Latch: MainFuture waits for this latch, which needs 2 notifications.
-  LGateLatch := TState.CreateLatch(2); // [cite: 77, 212, 330]
+  LGateLatch := TLatch.Construct(2); // [cite: 77, 212, 330]
 
   // Create MainFuture, AInitState is the GateLatch's state.
-  LMainFuture := TMycInitStateFuncFuture<string>.Create(FTaskFactory, LGateLatch.State,
+  LMainFuture := TMycGateFuncFuture<string>.Create(FTaskFactory, LGateLatch.State,
     function: string
     begin
       Inc(Self.FProcExecutionCount, 10); // Indicate MainFuture's proc ran
@@ -262,8 +262,8 @@ begin
 
   // Setup Prerequisite Futures
   // PrerequisiteFuture1
-  LInitStateP1 := TState.CreateLatch(1); // Controllable init state for PF1
-  LPrerequisiteFuture1 := TMycInitStateFuncFuture<Integer>.Create(FTaskFactory, LInitStateP1.State,
+  LInitStateP1 := TLatch.Construct(1); // Controllable init state for PF1
+  LPrerequisiteFuture1 := TMycGateFuncFuture<Integer>.Create(FTaskFactory, LInitStateP1.State,
     function: Integer
     begin
       Inc(Self.FProcExecutionCount, 1); // PF1 ran
@@ -273,8 +273,8 @@ begin
   Subscriptions[1] := LPrerequisiteFuture1.Done.Subscribe(LSub1); // Subscribe to PF1's completion [cite: 56, 188, 306]
 
   // PrerequisiteFuture2
-  LInitStateP2 := TState.CreateLatch(1); // Controllable init state for PF2
-  LPrerequisiteFuture2 := TMycInitStateFuncFuture<Integer>.Create(FTaskFactory, LInitStateP2.State,
+  LInitStateP2 := TLatch.Construct(1); // Controllable init state for PF2
+  LPrerequisiteFuture2 := TMycGateFuncFuture<Integer>.Create(FTaskFactory, LInitStateP2.State,
     function: Integer
     begin
       Inc(Self.FProcExecutionCount, 1); // PF2 ran
@@ -312,7 +312,7 @@ begin
   Subscriptions[2].Unsubscribe; //
 end;
 
-procedure TTestMycInitStateFuncFuture.Test_FanOut_MultipleFuturesWaitForOneTrigger;
+procedure TTestMycGateFuncFuture.Test_FanOut_MultipleFuturesWaitForOneTrigger;
 var
   LTriggerLatch: IMycLatch;
   LFutureA, LFutureB: IMycFuture<Integer>;
@@ -322,10 +322,10 @@ begin
   LFlagFutureBRan := False;
   Self.FSharedCounter := 0; // Reset shared counter for this test
 
-  LTriggerLatch := TState.CreateLatch(1); // Single trigger [cite: 77, 212, 330]
+  LTriggerLatch := TLatch.Construct(1); // Single trigger [cite: 77, 212, 330]
 
   // Future A
-  LFutureA := TMycInitStateFuncFuture<Integer>.Create(FTaskFactory, LTriggerLatch.State,
+  LFutureA := TMycGateFuncFuture<Integer>.Create(FTaskFactory, LTriggerLatch.State,
     function: Integer
     begin
       LFlagFutureARan := True;
@@ -334,7 +334,7 @@ begin
     end);
 
   // Future B
-  LFutureB := TMycInitStateFuncFuture<Integer>.Create(FTaskFactory, LTriggerLatch.State,
+  LFutureB := TMycGateFuncFuture<Integer>.Create(FTaskFactory, LTriggerLatch.State,
     function: Integer
     begin
       LFlagFutureBRan := True;
@@ -364,5 +364,5 @@ end;
 
 initialization
   // For DUnitX, attributes typically handle registration.
-  // If needed for older DUnit: RegisterTest(TTestMycInitStateFuncFuture.Suite);
+  // If needed for older DUnit: RegisterTest(TTestMycGateFuncFuture.Suite);
 end.

Test/TestFutures.pas

@@ -146,7 +146,7 @@ var
     delayedGate: IMycLatch; // IMycLatch implements IMycState [cite: 58]
     resultValue: Integer;
 begin
-    delayedGate := TState.CreateLatch( 1 ); // Create a latch that requires one notification to be set [cite: 66]
+    delayedGate := TLatch.Construct( 1 ); // Create a latch that requires one notification to be set [cite: 66]
     Assert.IsNotNull( delayedGate, 'The delayed gate (IMycLatch) should not be nil.' ); // Static string
     Assert.IsFalse( delayedGate.State.IsSet, 'The delayed gate should not be initially set.' ); // Static string [cite: 59, 55]
 
@@ -217,7 +217,7 @@ var
     delayedGate: IMycLatch;
     resultValue: string;
 begin
-    delayedGate := TState.CreateLatch( 1 ); // [cite: 66]
+    delayedGate := TLatch.Construct( 1 ); // [cite: 66]
     Assert.IsFalse( delayedGate.State.IsSet, 'The delayed gate for chain test should not be initially set.' );
     // Static string [cite: 59, 55]
 

Test/TestNotifier_ChaosStress.pas

@@ -308,7 +308,7 @@ end;
 procedure TMycNotifierChaosStressTests.Test_MixedOperations_Stress;
 const
     NumThreads = 24;        // Number of concurrent worker threads
-    IterationsPerThread = 5000; // Number of random operations per thread
+    IterationsPerThread = 2000; // Number of random operations per thread
 var
     threads: array of TStressWorkerThread;
     i: Integer;

Test/TestNotifier_Threading.pas

@@ -198,7 +198,7 @@ end;
 procedure TMycNotifierThreadingTests.Test_ConcurrentAdvise_Then_UnadviseAll_Consistency;
 const
     NumThreads = 24; // Number of threads
-    ItemsPerThread = 2500; // Number of Advise operations per thread
+    ItemsPerThread = 250; // Number of Advise operations per thread
 var
     threads: array of TAdviseWorkerThread;
     i: Integer;

Test/TestSignals_Dirty.pas

@@ -105,7 +105,7 @@ end;
 
 function TTestMycDirtyFlag.CreateAndPrepareDirtyFlag(StartDirty: Boolean = True): IMycDirty;
 begin
-  Result := TState.CreateDirty; // Initially dirty
+  Result := TDirty.Construct; // Initially dirty
   if not StartDirty then
     Result.Reset; // Reset to make it clean
   Assert.AreEqual(StartDirty, Result.State.IsSet, 'CreateAndPrepareDirtyFlag initial state incorrect.');
@@ -127,7 +127,7 @@ procedure TTestMycDirtyFlag.TestCreate_InitialStateIsDirty;
 var
   dirtyFlag: IMycDirty;
 begin
-  dirtyFlag := TState.CreateDirty;
+  dirtyFlag := TDirty.Construct;
   Assert.IsTrue(dirtyFlag.State.IsSet, 'Newly created dirty flag should be IsSet (dirty).');
 end;
 

Test/TestSignals_Latch.pas

@@ -124,7 +124,7 @@ var
   latch: IMycLatch;
 begin
   // TMycLatch.CreateLatch returns TMycLatch.Null if InitialCount <= 0
-  latch := TState.CreateLatch(InitialCount);
+  latch := TLatch.Construct(InitialCount);
   Assert.AreEqual(ExpectedIsSet, latch.State.IsSet, 'Latch initial IsSet state mismatch for count ' + IntToStr(InitialCount) + '.');
 end;
 
@@ -133,7 +133,7 @@ var
   latch: IMycLatch;
   returnedValueFromNotify: Boolean;
 begin
-  latch := TState.CreateLatch(InitialCount);
+  latch := TLatch.Construct(InitialCount);
   returnedValueFromNotify := latch.Notify; // This is IMycLatch (as IMycSubscriber).Notify
 
   Assert.AreEqual(ExpectedReturn, returnedValueFromNotify, 'Unexpected return value from Latch.Notify call for initial count ' + IntToStr(InitialCount) + '.');
@@ -144,7 +144,7 @@ procedure TTestMycLatch.TestNotify_DecrementsCounter_StateChanges;
 var
   latch: IMycLatch;
 begin
-  latch := TState.CreateLatch(1);
+  latch := TLatch.Construct(1);
   Assert.IsFalse(latch.State.IsSet, 'Latch should initially not be set (Count=1).');
   latch.Notify; // Count becomes 0
   Assert.IsTrue(latch.State.IsSet, 'Latch should be set after Notify (Count became 0).');
@@ -154,7 +154,7 @@ procedure TTestMycLatch.TestNotify_MultipleNotifies_CounterBecomesNegativeAndSta
 var
   latch: IMycLatch;
 begin
-  latch := TState.CreateLatch(1);
+  latch := TLatch.Construct(1);
   latch.Notify; // Count becomes 0, IsSet = True
   Assert.IsTrue(latch.State.IsSet, 'Latch should be set after first Notify.');
   latch.Notify; // Count becomes -1, IsSet should remain True
@@ -169,7 +169,7 @@ var
   mockSub: TMockSubscriber;
   subscription: TMycSubscription;
 begin
-  latch := TState.CreateLatch(1);
+  latch := TLatch.Construct(1);
   mockSub := TMockSubscriber.Create;
   subscription := latch.State.Subscribe(mockSub); // Subscribing to the Latch's state
 
@@ -188,7 +188,7 @@ var
   mockSub1, mockSub2, mockSub3: TMockSubscriber;
   sub1, sub2, sub3: TMycSubscription; // Keep subscriptions in scope
 begin
-  latch := TState.CreateLatch(1);
+  latch := TLatch.Construct(1);
   mockSub1 := TMockSubscriber.Create;
   mockSub2 := TMockSubscriber.Create;
   mockSub3 := TMockSubscriber.Create;
@@ -210,7 +210,7 @@ var
   mockSub: TMockSubscriber;
   subscription: TMycSubscription;
 begin
-  latch := TState.CreateLatch(2); // Count = 2
+  latch := TLatch.Construct(2); // Count = 2
   mockSub := TMockSubscriber.Create;
   subscription := latch.State.Subscribe(mockSub);
 
@@ -225,7 +225,7 @@ var
   mockSub: TMockSubscriber;
   subscription: TMycSubscription;
 begin
-  latch := TState.CreateLatch(1);
+  latch := TLatch.Construct(1);
   mockSub := TMockSubscriber.Create;
   subscription := latch.State.Subscribe(mockSub);
 
@@ -242,7 +242,7 @@ var
   mockSub1, mockSub2: TMockSubscriber;
   subscription1, subscription2: TMycSubscription;
 begin
-  latch := TState.CreateLatch(1); // Create with count 1
+  latch := TLatch.Construct(1); // Create with count 1
   mockSub1 := TMockSubscriber.Create;
   subscription1 := latch.State.Subscribe(mockSub1); // Subscribe before set
 
@@ -270,8 +270,8 @@ var
   mockSubForB: TMockSubscriber;
   subHandle_B_listens_A, subHandle_Mock_listens_B: TMycSubscription;
 begin
-  latchA := TState.CreateLatch(1);
-  latchB := TState.CreateLatch(1); // latchB is an IMycSubscriber
+  latchA := TLatch.Construct(1);
+  latchB := TLatch.Construct(1); // latchB is an IMycSubscriber
   mockSubForB := TMockSubscriber.Create;
 
   subHandle_Mock_listens_B := latchB.State.Subscribe(mockSubForB);
@@ -295,9 +295,9 @@ var
   mockSubForC: TMockSubscriber;
   sub_Mock_C, sub_C_B, sub_B_A: TMycSubscription;
 begin
-  latchA := TState.CreateLatch(1);
-  latchB := TState.CreateLatch(1);
-  latchC := TState.CreateLatch(1);
+  latchA := TLatch.Construct(1);
+  latchB := TLatch.Construct(1);
+  latchC := TLatch.Construct(1);
   mockSubForC := TMockSubscriber.Create;
 
   sub_Mock_C := latchC.State.Subscribe(mockSubForC);
@@ -320,8 +320,8 @@ var
 begin
   // LatchA needs 2 notifies to become set. LatchB needs 1 notify to become set.
   // LatchB subscribes to LatchA. So LatchB will be notified once LatchA becomes set.
-  latchA := TState.CreateLatch(2);
-  latchB := TState.CreateLatch(1);
+  latchA := TLatch.Construct(2);
+  latchB := TLatch.Construct(1);
   mockSubForB := TMockSubscriber.Create;
 
   sub_Mock_B := latchB.State.Subscribe(mockSubForB);
@@ -347,7 +347,7 @@ var
   mockSub: TMockSubscriber;
   subscription: TMycSubscription;
 begin
-  latch := TState.CreateLatch(0); // Returns TMycLatch.Null which is set.
+  latch := TLatch.Construct(0); // Returns TMycLatch.Null which is set.
   mockSub := TMockSubscriber.Create;
 
   subscription := latch.State.Subscribe(mockSub); // TMycLatch.Subscribe notifies immediately if already set.
@@ -362,7 +362,7 @@ var
   mockSub: TMockSubscriber;
   subscription: TMycSubscription;
 begin
-  latch := TState.CreateLatch(1);
+  latch := TLatch.Construct(1);
   mockSub := TMockSubscriber.Create;
 
   subscription := latch.State.Subscribe(mockSub);
@@ -381,7 +381,7 @@ var
   mockSub: TMockSubscriber;
   subscription: TMycSubscription;
 begin
-  latch := TState.CreateLatch(3);
+  latch := TLatch.Construct(3);
 
   latch.Notify; // Count -> 2
   latch.Notify; // Count -> 1
@@ -404,7 +404,7 @@ var
   mockSub1, mockSub2: TMockSubscriber;
   subscription1, subscription2: TMycSubscription;
 begin
-  latch := TState.CreateLatch(1);
+  latch := TLatch.Construct(1);
   mockSub1 := TMockSubscriber.Create;
   mockSub2 := TMockSubscriber.Create;
 
@@ -432,7 +432,7 @@ var
   mockSub: TMockSubscriber;
   // 'subscription' will be declared in an inner scope to control its finalization
 begin
-  latch := TState.CreateLatch(1);
+  latch := TLatch.Construct(1);
   mockSub := TMockSubscriber.Create;
 
   var noException: Boolean := True;
@@ -468,7 +468,7 @@ var
   mockSubInitial, mockSubNew: TMockSubscriber;
   subscriptionInitial, subscriptionNew: TMycSubscription;
 begin
-  latch := TState.CreateLatch(1);
+  latch := TLatch.Construct(1);
   mockSubInitial := TMockSubscriber.Create;
   subscriptionInitial := latch.State.Subscribe(mockSubInitial);
 

Test/TestTasks.pas

@@ -91,7 +91,7 @@ var
     jobCompletedLatch: IMycLatch;
 begin
     jobExecuted := False;
-    jobCompletedLatch := TMycLatch.CreateLatch(1); // Changed from Signals.CreateLatch
+    jobCompletedLatch := TLatch.Construct(1); // Changed from Signals.CreateLatch
 
     FFactory.Run(
         procedure
@@ -111,7 +111,7 @@ var
     subscriber: IMycSubscriber;
 begin
     jobExecuted := False;
-    jobCompletedLatch := TMycLatch.CreateLatch(1); // Changed from Signals.CreateLatch
+    jobCompletedLatch := TLatch.Construct(1); // Changed from Signals.CreateLatch
 
     subscriber := FFactory.Run(
         procedure
@@ -122,7 +122,7 @@ begin
 
     Assert.IsNotNull(subscriber, 'Run should return a subscriber for delayed job');
     // Use TMycLatch.Null for comparison
-    Assert.AreNotEqual<IMycSubscriber>(TMycLatch.Null, subscriber, 'Subscriber should not be TMycLatch.Null for StartCount > 0');
+    Assert.AreNotEqual<IMycSubscriber>(TLatch.Null, subscriber, 'Subscriber should not be TMycLatch.Null for StartCount > 0');
 
     subscriber.Notify;
 
@@ -137,7 +137,7 @@ var
     startTime, endTime: Cardinal;
 begin
     // TMycLatch.CreateLatch(0) will return TMycLatch.Null
-    alreadySetLatch := TMycLatch.CreateLatch(0); // Changed from Signals.CreateLatch
+    alreadySetLatch := TLatch.Construct(0); // Changed from Signals.CreateLatch
     Assert.IsTrue(alreadySetLatch.State.IsSet, 'Latch should be initially set');
 
     startTime := TThread.GetTickCount;
@@ -155,7 +155,7 @@ var
 begin
     inMainThreadInJob := True;
     inWorkerThreadInJob := False;
-    jobDoneLatch := TMycLatch.CreateLatch(1); // Changed from Signals.CreateLatch
+    jobDoneLatch := TLatch.Construct(1); // Changed from Signals.CreateLatch
 
     Assert.IsTrue(FFactory.InMainThread, 'Test method itself should be in main thread');
     Assert.IsFalse(FFactory.InWorkerThread, 'Test method itself should not be in a factory worker thread');
@@ -178,7 +178,7 @@ procedure TMycTaskFactoryTests.TestExceptionPropagationFromJob;
 var
     jobDoneLatch: IMycLatch;
 begin
-    jobDoneLatch := TMycLatch.CreateLatch(1);
+    jobDoneLatch := TLatch.Construct(1);
 
     FFactory.EnqueueJob(
         procedure
@@ -229,8 +229,8 @@ var
     dummyStateToWaitFor: IMycState;
 begin
     exceptionCaughtInJob := False;
-    jobDoneLatch := TMycLatch.CreateLatch(1);
-    dummyStateToWaitFor := TMycLatch.CreateLatch(1).State;
+    jobDoneLatch := TLatch.Construct(1);
+    dummyStateToWaitFor := TLatch.Construct(1).State;
 
     FFactory.EnqueueJob(
         procedure