Future<T> helper record

Src/Myc.Core.Tasks.pas

@@ -41,13 +41,6 @@ type
         // will be re-raised in the calling (main) thread.
         procedure Teardown;
 
-        // Waits for the operation associated with State to complete.
-        // Must not be called from a worker thread of this factory.
-        // After waiting, or if the state is already set, any first stored exception
-        // from any worker thread of this factory will be re-raised in the calling (main) thread.
-        // Raises ETaskException if called from within a worker thread.
-        procedure WaitFor(State: IMycState);
-
         // Gets the number of worker threads.
         property ThreadCount: Integer read GetThreadCount;
     end;
@@ -89,6 +82,7 @@ type
         function InMainThread: Boolean;
         function InWorkerThread: Boolean;
 
+        // Initialize global TaskManager
         class procedure AquireTaskManager;
         class procedure ReleaseTaskManager;
     end;

Src/Myc.Futures.pas

@@ -22,14 +22,26 @@ type
     Future<T> = record
     strict private
         FFuture: IMycFuture<T>;
+        function GetDone: IMycState; inline;
+        function GetResult: T; inline;
+
         class constructor CreateClass;
         class destructor DestroyClass;
-        constructor Create(const AFuture: IMycFuture<T>);
-    public
-        class function Construct(const Proc: TFunc<T>): Future<T>; overload; static;
-        class function Construct(const Gate: IMycState; const Proc: TFunc<T>): Future<T>; overload; static;
 
-        function Chain<S>(const Proc: TFunc<T, S>): Future<S>;
+    public
+        constructor Create(const AFuture: IMycFuture<T>);
+        class operator Implicit(const A: IMycFuture<T>): Future<T>; overload;
+        class operator Implicit(const A: Future<T>): IMycFuture<T>; overload;
+
+        class function Construct(const Proc: TFunc<T>): IMycFuture<T>; overload; static;
+        class function Construct(const Gate: IMycState; const Proc: TFunc<T>): IMycFuture<T>; overload; static;
+
+        function Chain<S>(const Proc: TFunc<T, S>): IMycFuture<S>;
+
+        function WaitFor: T;
+
+        property Done: IMycState read GetDone;
+        property Result: T read GetResult;
     end;
 
 implementation
@@ -52,7 +64,7 @@ begin
     TMycTaskFactory.ReleaseTaskManager;
 end;
 
-function Future<T>.Chain<S>(const Proc: TFunc<T, S>): Future<S>;
+function Future<T>.Chain<S>(const Proc: TFunc<T, S>): IMycFuture<S>;
 begin
     var Cap := FFuture;
 
@@ -63,14 +75,40 @@ begin
         end );
 end;
 
-class function Future<T>.Construct(const Proc: TFunc<T>): Future<T>;
+class function Future<T>.Construct(const Proc: TFunc<T>): IMycFuture<T>;
 begin
-    Result.Create( TMycInitStateFuncFuture<T>.Create( TaskManager, nil, Proc ) );
+    Result := TMycInitStateFuncFuture<T>.Create( TaskManager, nil, Proc );
 end;
 
-class function Future<T>.Construct(const Gate: IMycState; const Proc: TFunc<T>): Future<T>;
+class function Future<T>.Construct(const Gate: IMycState; const Proc: TFunc<T>): IMycFuture<T>;
 begin
-    Result.Create( TMycInitStateFuncFuture<T>.Create( TaskManager, Gate, Proc ) );
+    Result := TMycInitStateFuncFuture<T>.Create( TaskManager, Gate, Proc );
+end;
+
+function Future<T>.GetDone: IMycState;
+begin
+    Result := FFuture.Done;
+end;
+
+function Future<T>.GetResult: T;
+begin
+    Result := FFuture.Result;
+end;
+
+function Future<T>.WaitFor: T;
+begin
+    TaskManager.WaitFor( FFuture.Done );
+    Result := FFuture.Result;
+end;
+
+class operator Future<T>.Implicit(const A: IMycFuture<T>): Future<T>;
+begin
+    Result.Create( A );
+end;
+
+class operator Future<T>.Implicit(const A: Future<T>): IMycFuture<T>;
+begin
+    Result := A.FFuture;
 end;
 
 end.

Src/Myc.TaskManager.pas

@@ -9,6 +9,13 @@ uses
 type
     IMycTaskManager = interface
         function CreateTask( const Gate: IMycState; const Proc: TProc ): TMycSubscription;
+
+        // Waits for the operation associated with State to complete.
+        // Must not be called from a worker thread of this factory.
+        // After waiting, or if the state is already set, any first stored exception
+        // from any worker thread of this factory will be re-raised in the calling (main) thread.
+        // Raises ETaskException if called from within a worker thread.
+        procedure WaitFor(State: IMycState);
     end;
 
 var