--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Implab/FuncTaskBase.cs	Fri Apr 22 13:10:34 2016 +0300
@@ -0,0 +1,52 @@
+using System;
+
+namespace Implab {
+    public class FuncTaskBase<TResult> : AbstractTask<TResult> {
+        readonly Func<Exception, TResult> m_cancel;
+        readonly Func<Exception, TResult> m_error;
+
+        protected FuncTaskBase( Func<Exception, TResult> error, Func<Exception, TResult> cancel, bool autoCancellable) {
+            m_error = error;
+            m_cancel = cancel;
+            if (autoCancellable)
+                CancellationRequested(CancelOperation);
+        }
+
+        public void Reject(Exception error) {
+            Safe.ArgumentNotNull(error, "error");
+            if (LockCancelation())
+                HandleErrorInternal(error);
+        }
+
+        protected void HandleErrorInternal(Exception error) {
+            if (m_error != null) {
+                try {
+                    SetResult(m_error(error));
+                } catch(Exception err) {
+                    SetErrorInternal(err);
+                }
+            } else {
+                SetErrorInternal(error);
+            }
+        }
+
+        public override void CancelOperation(Exception reason) {
+            if (LockCancelation())
+                HandleCancelInternal(reason);
+        }
+
+        protected void HandleCancelInternal(Exception reason) {
+            if (m_cancel != null) {
+                try {
+                    SetResult(m_cancel(reason));
+                } catch (Exception err) {
+                    HandleErrorInternal(err);
+                }
+            } else {
+                HandleErrorInternal(reason ?? new OperationCanceledException());
+            }
+        }
+
+    }
+}
+