101e7fad6acf43df86b266928f602d9709af67baephilip.liard@gmail.com// Copyright (c) 2011 The Chromium Authors. All rights reserved. 201e7fad6acf43df86b266928f602d9709af67baephilip.liard@gmail.com// Use of this source code is governed by a BSD-style license that can be 301e7fad6acf43df86b266928f602d9709af67baephilip.liard@gmail.com// found in the LICENSE file. 401e7fad6acf43df86b266928f602d9709af67baephilip.liard@gmail.com 501e7fad6acf43df86b266928f602d9709af67baephilip.liard@gmail.com#ifndef I18N_PHONENUMBERS_BASE_TEMPLATE_UTIL_H_ 601e7fad6acf43df86b266928f602d9709af67baephilip.liard@gmail.com#define I18N_PHONENUMBERS_BASE_TEMPLATE_UTIL_H_ 701e7fad6acf43df86b266928f602d9709af67baephilip.liard@gmail.com 801e7fad6acf43df86b266928f602d9709af67baephilip.liard@gmail.com#include <cstddef> // For size_t. 901e7fad6acf43df86b266928f602d9709af67baephilip.liard@gmail.com 1094f3dc686d5f369ee596aa3e22344683f6773494philip.liard@gmail.comnamespace i18n { 1194f3dc686d5f369ee596aa3e22344683f6773494philip.liard@gmail.comnamespace phonenumbers { 1201e7fad6acf43df86b266928f602d9709af67baephilip.liard@gmail.com 1301e7fad6acf43df86b266928f602d9709af67baephilip.liard@gmail.com// template definitions from tr1 1401e7fad6acf43df86b266928f602d9709af67baephilip.liard@gmail.com 1501e7fad6acf43df86b266928f602d9709af67baephilip.liard@gmail.comtemplate<class T, T v> 1601e7fad6acf43df86b266928f602d9709af67baephilip.liard@gmail.comstruct integral_constant { 1701e7fad6acf43df86b266928f602d9709af67baephilip.liard@gmail.com static const T value = v; 1801e7fad6acf43df86b266928f602d9709af67baephilip.liard@gmail.com typedef T value_type; 1901e7fad6acf43df86b266928f602d9709af67baephilip.liard@gmail.com typedef integral_constant<T, v> type; 2001e7fad6acf43df86b266928f602d9709af67baephilip.liard@gmail.com}; 2101e7fad6acf43df86b266928f602d9709af67baephilip.liard@gmail.com 2201e7fad6acf43df86b266928f602d9709af67baephilip.liard@gmail.comtemplate <class T, T v> const T integral_constant<T, v>::value; 2301e7fad6acf43df86b266928f602d9709af67baephilip.liard@gmail.com 2401e7fad6acf43df86b266928f602d9709af67baephilip.liard@gmail.comtypedef integral_constant<bool, true> true_type; 2501e7fad6acf43df86b266928f602d9709af67baephilip.liard@gmail.comtypedef integral_constant<bool, false> false_type; 2601e7fad6acf43df86b266928f602d9709af67baephilip.liard@gmail.com 2701e7fad6acf43df86b266928f602d9709af67baephilip.liard@gmail.comtemplate <class T> struct is_pointer : false_type {}; 2801e7fad6acf43df86b266928f602d9709af67baephilip.liard@gmail.comtemplate <class T> struct is_pointer<T*> : true_type {}; 2901e7fad6acf43df86b266928f602d9709af67baephilip.liard@gmail.com 3001e7fad6acf43df86b266928f602d9709af67baephilip.liard@gmail.comtemplate <class T, class U> struct is_same : public false_type {}; 3101e7fad6acf43df86b266928f602d9709af67baephilip.liard@gmail.comtemplate <class T> struct is_same<T,T> : true_type {}; 3201e7fad6acf43df86b266928f602d9709af67baephilip.liard@gmail.com 3301e7fad6acf43df86b266928f602d9709af67baephilip.liard@gmail.comtemplate<class> struct is_array : public false_type {}; 3401e7fad6acf43df86b266928f602d9709af67baephilip.liard@gmail.comtemplate<class T, size_t n> struct is_array<T[n]> : public true_type {}; 3501e7fad6acf43df86b266928f602d9709af67baephilip.liard@gmail.comtemplate<class T> struct is_array<T[]> : public true_type {}; 3601e7fad6acf43df86b266928f602d9709af67baephilip.liard@gmail.com 3701e7fad6acf43df86b266928f602d9709af67baephilip.liard@gmail.comtemplate <class T> struct is_non_const_reference : false_type {}; 3801e7fad6acf43df86b266928f602d9709af67baephilip.liard@gmail.comtemplate <class T> struct is_non_const_reference<T&> : true_type {}; 3901e7fad6acf43df86b266928f602d9709af67baephilip.liard@gmail.comtemplate <class T> struct is_non_const_reference<const T&> : false_type {}; 4001e7fad6acf43df86b266928f602d9709af67baephilip.liard@gmail.com 4101e7fad6acf43df86b266928f602d9709af67baephilip.liard@gmail.comtemplate <class T> struct is_void : false_type {}; 4201e7fad6acf43df86b266928f602d9709af67baephilip.liard@gmail.comtemplate <> struct is_void<void> : true_type {}; 4301e7fad6acf43df86b266928f602d9709af67baephilip.liard@gmail.com 4401e7fad6acf43df86b266928f602d9709af67baephilip.liard@gmail.comnamespace internal { 4501e7fad6acf43df86b266928f602d9709af67baephilip.liard@gmail.com 4601e7fad6acf43df86b266928f602d9709af67baephilip.liard@gmail.com// Types YesType and NoType are guaranteed such that sizeof(YesType) < 4701e7fad6acf43df86b266928f602d9709af67baephilip.liard@gmail.com// sizeof(NoType). 4801e7fad6acf43df86b266928f602d9709af67baephilip.liard@gmail.comtypedef char YesType; 4901e7fad6acf43df86b266928f602d9709af67baephilip.liard@gmail.com 5001e7fad6acf43df86b266928f602d9709af67baephilip.liard@gmail.comstruct NoType { 5101e7fad6acf43df86b266928f602d9709af67baephilip.liard@gmail.com YesType dummy[2]; 5201e7fad6acf43df86b266928f602d9709af67baephilip.liard@gmail.com}; 5301e7fad6acf43df86b266928f602d9709af67baephilip.liard@gmail.com 5401e7fad6acf43df86b266928f602d9709af67baephilip.liard@gmail.com// This class is an implementation detail for is_convertible, and you 5501e7fad6acf43df86b266928f602d9709af67baephilip.liard@gmail.com// don't need to know how it works to use is_convertible. For those 5601e7fad6acf43df86b266928f602d9709af67baephilip.liard@gmail.com// who care: we declare two different functions, one whose argument is 5701e7fad6acf43df86b266928f602d9709af67baephilip.liard@gmail.com// of type To and one with a variadic argument list. We give them 5801e7fad6acf43df86b266928f602d9709af67baephilip.liard@gmail.com// return types of different size, so we can use sizeof to trick the 5901e7fad6acf43df86b266928f602d9709af67baephilip.liard@gmail.com// compiler into telling us which function it would have chosen if we 6001e7fad6acf43df86b266928f602d9709af67baephilip.liard@gmail.com// had called it with an argument of type From. See Alexandrescu's 6101e7fad6acf43df86b266928f602d9709af67baephilip.liard@gmail.com// _Modern C++ Design_ for more details on this sort of trick. 6201e7fad6acf43df86b266928f602d9709af67baephilip.liard@gmail.com 6301e7fad6acf43df86b266928f602d9709af67baephilip.liard@gmail.comstruct ConvertHelper { 6401e7fad6acf43df86b266928f602d9709af67baephilip.liard@gmail.com template <typename To> 6501e7fad6acf43df86b266928f602d9709af67baephilip.liard@gmail.com static YesType Test(To); 6601e7fad6acf43df86b266928f602d9709af67baephilip.liard@gmail.com 6701e7fad6acf43df86b266928f602d9709af67baephilip.liard@gmail.com template <typename To> 6801e7fad6acf43df86b266928f602d9709af67baephilip.liard@gmail.com static NoType Test(...); 6901e7fad6acf43df86b266928f602d9709af67baephilip.liard@gmail.com 7001e7fad6acf43df86b266928f602d9709af67baephilip.liard@gmail.com template <typename From> 7101e7fad6acf43df86b266928f602d9709af67baephilip.liard@gmail.com static From& Create(); 7201e7fad6acf43df86b266928f602d9709af67baephilip.liard@gmail.com}; 7301e7fad6acf43df86b266928f602d9709af67baephilip.liard@gmail.com 7401e7fad6acf43df86b266928f602d9709af67baephilip.liard@gmail.com// Used to determine if a type is a struct/union/class. Inspired by Boost's 7501e7fad6acf43df86b266928f602d9709af67baephilip.liard@gmail.com// is_class type_trait implementation. 7601e7fad6acf43df86b266928f602d9709af67baephilip.liard@gmail.comstruct IsClassHelper { 7701e7fad6acf43df86b266928f602d9709af67baephilip.liard@gmail.com template <typename C> 7801e7fad6acf43df86b266928f602d9709af67baephilip.liard@gmail.com static YesType Test(void(C::*)(void)); 7901e7fad6acf43df86b266928f602d9709af67baephilip.liard@gmail.com 8001e7fad6acf43df86b266928f602d9709af67baephilip.liard@gmail.com template <typename C> 8101e7fad6acf43df86b266928f602d9709af67baephilip.liard@gmail.com static NoType Test(...); 8201e7fad6acf43df86b266928f602d9709af67baephilip.liard@gmail.com}; 8301e7fad6acf43df86b266928f602d9709af67baephilip.liard@gmail.com 8401e7fad6acf43df86b266928f602d9709af67baephilip.liard@gmail.com} // namespace internal 8501e7fad6acf43df86b266928f602d9709af67baephilip.liard@gmail.com 8601e7fad6acf43df86b266928f602d9709af67baephilip.liard@gmail.com// Inherits from true_type if From is convertible to To, false_type otherwise. 8701e7fad6acf43df86b266928f602d9709af67baephilip.liard@gmail.com// 8801e7fad6acf43df86b266928f602d9709af67baephilip.liard@gmail.com// Note that if the type is convertible, this will be a true_type REGARDLESS 8901e7fad6acf43df86b266928f602d9709af67baephilip.liard@gmail.com// of whether or not the conversion would emit a warning. 9001e7fad6acf43df86b266928f602d9709af67baephilip.liard@gmail.comtemplate <typename From, typename To> 9101e7fad6acf43df86b266928f602d9709af67baephilip.liard@gmail.comstruct is_convertible 9201e7fad6acf43df86b266928f602d9709af67baephilip.liard@gmail.com : integral_constant<bool, 9301e7fad6acf43df86b266928f602d9709af67baephilip.liard@gmail.com sizeof(internal::ConvertHelper::Test<To>( 9401e7fad6acf43df86b266928f602d9709af67baephilip.liard@gmail.com internal::ConvertHelper::Create<From>())) == 9501e7fad6acf43df86b266928f602d9709af67baephilip.liard@gmail.com sizeof(internal::YesType)> { 9601e7fad6acf43df86b266928f602d9709af67baephilip.liard@gmail.com}; 9701e7fad6acf43df86b266928f602d9709af67baephilip.liard@gmail.com 9801e7fad6acf43df86b266928f602d9709af67baephilip.liard@gmail.comtemplate <typename T> 9901e7fad6acf43df86b266928f602d9709af67baephilip.liard@gmail.comstruct is_class 10001e7fad6acf43df86b266928f602d9709af67baephilip.liard@gmail.com : integral_constant<bool, 10101e7fad6acf43df86b266928f602d9709af67baephilip.liard@gmail.com sizeof(internal::IsClassHelper::Test<T>(0)) == 10201e7fad6acf43df86b266928f602d9709af67baephilip.liard@gmail.com sizeof(internal::YesType)> { 10301e7fad6acf43df86b266928f602d9709af67baephilip.liard@gmail.com}; 10401e7fad6acf43df86b266928f602d9709af67baephilip.liard@gmail.com 10594f3dc686d5f369ee596aa3e22344683f6773494philip.liard@gmail.com} // namespace phonenumbers 10694f3dc686d5f369ee596aa3e22344683f6773494philip.liard@gmail.com} // namespace i18n 10701e7fad6acf43df86b266928f602d9709af67baephilip.liard@gmail.com 10801e7fad6acf43df86b266928f602d9709af67baephilip.liard@gmail.com#endif // I18N_PHONENUMBERS_BASE_TEMPLATE_UTIL_H_ 109