|  | // Copyright (c) 2011 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 BASE_TEMPLATE_UTIL_H_ | 
|  | #define BASE_TEMPLATE_UTIL_H_ | 
|  |  | 
|  | #include <type_traits> | 
|  |  | 
|  | #include "build/build_config.h" | 
|  |  | 
|  | namespace base { | 
|  |  | 
|  | template <class T> struct is_non_const_reference : std::false_type {}; | 
|  | template <class T> struct is_non_const_reference<T&> : std::true_type {}; | 
|  | template <class T> struct is_non_const_reference<const T&> : std::false_type {}; | 
|  |  | 
|  | }  // namespace base | 
|  |  | 
|  | #endif  // BASE_TEMPLATE_UTIL_H_ |