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| 1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
| 4 | 4 |
| 5 #ifndef BASE_TEMPLATE_UTIL_H_ | 5 #ifndef BASE_TEMPLATE_UTIL_H_ |
| 6 #define BASE_TEMPLATE_UTIL_H_ | 6 #define BASE_TEMPLATE_UTIL_H_ |
| 7 | 7 |
| 8 #include <cstddef> // For size_t. | 8 #include <cstddef> // For size_t. |
| 9 | 9 |
| 10 namespace base { | 10 namespace base { |
| 11 | 11 |
| 12 template<class T, T v> | 12 template <class T, T v> |
| 13 struct integral_constant { | 13 struct integral_constant { |
| 14 static const T value = v; | 14 static const T value = v; |
| 15 typedef T value_type; | 15 typedef T value_type; |
| 16 typedef integral_constant<T, v> type; | 16 typedef integral_constant<T, v> type; |
| 17 }; | 17 }; |
| 18 | 18 |
| 19 typedef integral_constant<bool, true> true_type; | 19 typedef integral_constant<bool, true> true_type; |
| 20 typedef integral_constant<bool, false> false_type; | 20 typedef integral_constant<bool, false> false_type; |
| 21 | 21 |
| 22 template <class T, class U> struct is_same : public false_type {}; | 22 template <class T, class U> |
| 23 template <class T> struct is_same<T,T> : true_type {}; | 23 struct is_same : public false_type {}; |
| 24 template <class T> |
| 25 struct is_same<T, T> : true_type {}; |
| 24 | 26 |
| 25 template<bool B, class T = void> | 27 template <bool B, class T = void> |
| 26 struct enable_if {}; | 28 struct enable_if {}; |
| 27 | 29 |
| 28 template<class T> | 30 template <class T> |
| 29 struct enable_if<true, T> { typedef T type; }; | 31 struct enable_if<true, T> { |
| 32 typedef T type; |
| 33 }; |
| 30 | 34 |
| 31 } // namespace base | 35 } // namespace base |
| 32 | 36 |
| 33 #endif // BASE_TEMPLATE_UTIL_H_ | 37 #endif // BASE_TEMPLATE_UTIL_H_ |
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