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| 1 // Copyright 2014 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. |
| 4 |
| 5 #ifndef MOJO_PUBLIC_BINDINGS_LIB_CALLBACK_INTERNAL_H_ |
| 6 #define MOJO_PUBLIC_BINDINGS_LIB_CALLBACK_INTERNAL_H_ |
| 7 |
| 8 #include "mojo/public/bindings/lib/bindings_internal.h" |
| 9 |
| 10 namespace mojo { |
| 11 namespace internal { |
| 12 |
| 13 template <typename T, bool is_object_type = TypeTraits<T>::kIsObject> |
| 14 struct Callback_ParamTraits {}; |
| 15 |
| 16 template <typename T> |
| 17 struct Callback_ParamTraits<T, true> { |
| 18 typedef const T& ForwardType; |
| 19 static const bool kIsScopedHandle = false; |
| 20 }; |
| 21 |
| 22 template <typename T> |
| 23 struct Callback_ParamTraits<T, false> { |
| 24 typedef T ForwardType; |
| 25 static const bool kIsScopedHandle = false; |
| 26 }; |
| 27 |
| 28 template <typename H> |
| 29 struct Callback_ParamTraits<ScopedHandleBase<H>, true> { |
| 30 typedef ScopedHandleBase<H> ForwardType; |
| 31 static const bool kIsScopedHandle = true; |
| 32 }; |
| 33 |
| 34 template<bool B, typename T = void> |
| 35 struct EnableIf {}; |
| 36 |
| 37 template<typename T> |
| 38 struct EnableIf<true, T> { typedef T type; }; |
| 39 |
| 40 template <typename T> |
| 41 typename EnableIf<!Callback_ParamTraits<T>::kIsScopedHandle, T>::type& |
| 42 Callback_Forward(T& t) { |
| 43 return t; |
| 44 } |
| 45 |
| 46 template <typename T> |
| 47 typename EnableIf<Callback_ParamTraits<T>::kIsScopedHandle, T>::type |
| 48 Callback_Forward(T& t) { |
| 49 return t.Pass(); |
| 50 } |
| 51 |
| 52 } // namespace internal |
| 53 } // namespace mojo |
| 54 |
| 55 #endif // MOJO_PUBLIC_BINDINGS_LIB_CALLBACK_INTERNAL_H_ |
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