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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 #pragma once | 7 #pragma once |
8 | 8 |
9 #include <cstddef> // For size_t. | 9 #include <cstddef> // For size_t. |
10 | 10 |
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63 // _Modern C++ Design_ for more details on this sort of trick. | 63 // _Modern C++ Design_ for more details on this sort of trick. |
64 | 64 |
65 struct ConvertHelper { | 65 struct ConvertHelper { |
66 template <typename To> | 66 template <typename To> |
67 static YesType Test(To); | 67 static YesType Test(To); |
68 | 68 |
69 template <typename To> | 69 template <typename To> |
70 static NoType Test(...); | 70 static NoType Test(...); |
71 | 71 |
72 template <typename From> | 72 template <typename From> |
73 static From Create(); | 73 static From& Create(); |
74 }; | 74 }; |
75 | 75 |
76 // Used to determine if a type is a struct/union/class. Inspired by Boost's | 76 // Used to determine if a type is a struct/union/class. Inspired by Boost's |
77 // is_class type_trait implementation. | 77 // is_class type_trait implementation. |
78 struct IsClassHelper { | 78 struct IsClassHelper { |
79 template <typename C> | 79 template <typename C> |
80 static YesType Test(void(C::*)(void)); | 80 static YesType Test(void(C::*)(void)); |
81 | 81 |
82 template <typename C> | 82 template <typename C> |
83 static NoType Test(...); | 83 static NoType Test(...); |
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100 template <typename T> | 100 template <typename T> |
101 struct is_class | 101 struct is_class |
102 : integral_constant<bool, | 102 : integral_constant<bool, |
103 sizeof(internal::IsClassHelper::Test<T>(0)) == | 103 sizeof(internal::IsClassHelper::Test<T>(0)) == |
104 sizeof(internal::YesType)> { | 104 sizeof(internal::YesType)> { |
105 }; | 105 }; |
106 | 106 |
107 } // namespace base | 107 } // namespace base |
108 | 108 |
109 #endif // BASE_TEMPLATE_UTIL_H_ | 109 #endif // BASE_TEMPLATE_UTIL_H_ |
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