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Unified Diff: base/callback_forward.h

Issue 2513363003: repro for crbug.com/663886
Patch Set: Created 4 years, 1 month ago
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Index: base/callback_forward.h
diff --git a/base/callback_forward.h b/base/callback_forward.h
index 13eed0eb0d2fd7e61f092698456fa92e04a46b3b..3703515a42396a43014ec476e784f6973c564aa6 100644
--- a/base/callback_forward.h
+++ b/base/callback_forward.h
@@ -45,4 +45,45 @@ using RepeatingClosure = RepeatingCallback<void()>;
} // namespace base
+namespace base {
+namespace dupe {
+namespace internal {
+
+// CopyMode is used to control the copyablity of a Callback.
+// MoveOnly indicates the Callback is not copyable but movable, and Copyable
+// indicates it is copyable and movable.
+enum class CopyMode {
+ MoveOnly,
+ Copyable,
+};
+
+enum class RepeatMode {
+ Once,
+ Repeating,
+};
+
+} // namespace internal
+
+template <typename Signature,
+ internal::CopyMode copy_mode = internal::CopyMode::Copyable,
+ internal::RepeatMode repeat_mode = internal::RepeatMode::Repeating>
+class Callback;
+
+// Syntactic sugar to make Callback<void()> easier to declare since it
+// will be used in a lot of APIs with delayed execution.
+using Closure = Callback<void()>;
+
+template <typename Signature>
+using OnceCallback = Callback<Signature,
+ internal::CopyMode::MoveOnly,
+ internal::RepeatMode::Once>;
+template <typename Signature>
+using RepeatingCallback = Callback<Signature,
+ internal::CopyMode::Copyable,
+ internal::RepeatMode::Repeating>;
+using OnceClosure = OnceCallback<void()>;
+using RepeatingClosure = RepeatingCallback<void()>;
+
+}
+} // namespace base
#endif // BASE_CALLBACK_FORWARD_H_
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