Index: mojo/public/bindings/lib/callback_internal.h |
diff --git a/mojo/public/bindings/lib/callback_internal.h b/mojo/public/bindings/lib/callback_internal.h |
new file mode 100644 |
index 0000000000000000000000000000000000000000..4e7e9967886f88fa7ea46aa55188fd9aca384301 |
--- /dev/null |
+++ b/mojo/public/bindings/lib/callback_internal.h |
@@ -0,0 +1,55 @@ |
+// Copyright 2014 The Chromium Authors. All rights reserved. |
+// Use of this source code is governed by a BSD-style license that can be |
+// found in the LICENSE file. |
+ |
+#ifndef MOJO_PUBLIC_BINDINGS_LIB_CALLBACK_INTERNAL_H_ |
+#define MOJO_PUBLIC_BINDINGS_LIB_CALLBACK_INTERNAL_H_ |
+ |
+#include "mojo/public/bindings/lib/bindings_internal.h" |
+ |
+namespace mojo { |
+namespace internal { |
+ |
+template <typename T, bool is_object_type = TypeTraits<T>::kIsObject> |
+struct Callback_ParamTraits {}; |
+ |
+template <typename T> |
+struct Callback_ParamTraits<T, true> { |
+ typedef const T& ForwardType; |
+ static const bool kIsScopedHandle = false; |
+}; |
+ |
+template <typename T> |
+struct Callback_ParamTraits<T, false> { |
+ typedef T ForwardType; |
+ static const bool kIsScopedHandle = false; |
+}; |
+ |
+template <typename H> |
+struct Callback_ParamTraits<ScopedHandleBase<H>, true> { |
+ typedef ScopedHandleBase<H> ForwardType; |
+ static const bool kIsScopedHandle = true; |
+}; |
+ |
+template<bool B, typename T = void> |
+struct EnableIf {}; |
+ |
+template<typename T> |
+struct EnableIf<true, T> { typedef T type; }; |
+ |
+template <typename T> |
+typename EnableIf<!Callback_ParamTraits<T>::kIsScopedHandle, T>::type& |
+ Callback_Forward(T& t) { |
+ return t; |
+} |
+ |
+template <typename T> |
+typename EnableIf<Callback_ParamTraits<T>::kIsScopedHandle, T>::type |
+ Callback_Forward(T& t) { |
+ return t.Pass(); |
+} |
+ |
+} // namespace internal |
+} // namespace mojo |
+ |
+#endif // MOJO_PUBLIC_BINDINGS_LIB_CALLBACK_INTERNAL_H_ |