// Copyright (c) 2014 Marshall A. Greenblatt. Portions copyright (c) 2011 // Google Inc. All rights reserved. // // Redistribution and use in source and binary forms, with or without // modification, are permitted provided that the following conditions are // met: // // * Redistributions of source code must retain the above copyright // notice, this list of conditions and the following disclaimer. // * Redistributions in binary form must reproduce the above // copyright notice, this list of conditions and the following disclaimer // in the documentation and/or other materials provided with the // distribution. // * Neither the name of Google Inc. nor the name Chromium Embedded // Framework nor the names of its contributors may be used to endorse // or promote products derived from this software without specific prior // written permission. // // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. #ifndef CEF_INCLUDE_BASE_CEF_TEMPLATE_UTIL_H_ #define CEF_INCLUDE_BASE_CEF_TEMPLATE_UTIL_H_ #pragma once #if defined(BASE_TEMPLATE_UTIL_H_) // Do nothing if the Chromium header has already been included. // This can happen in cases where Chromium code is used directly by the // client application. When using Chromium code directly always include // the Chromium header first to avoid type conflicts. #elif defined(USING_CHROMIUM_INCLUDES) // When building CEF include the Chromium header directly. #include "base/template_util.h" #else // !USING_CHROMIUM_INCLUDES // The following is substantially similar to the Chromium implementation. // If the Chromium implementation diverges the below implementation should be // updated to match. #include <cstddef> // For size_t. #include "include/base/cef_build.h" namespace base { // template definitions from tr1 template <class T, T v> struct integral_constant { static const T value = v; typedef T value_type; typedef integral_constant<T, v> type; }; template <class T, T v> const T integral_constant<T, v>::value; typedef integral_constant<bool, true> true_type; typedef integral_constant<bool, false> false_type; template <class T> struct is_pointer : false_type {}; template <class T> struct is_pointer<T*> : true_type {}; // Member function pointer detection up to four params. Add more as needed // below. This is built-in to C++ 11, and we can remove this when we switch. template <typename T> struct is_member_function_pointer : false_type {}; template <typename R, typename Z> struct is_member_function_pointer<R (Z::*)()> : true_type {}; template <typename R, typename Z> struct is_member_function_pointer<R (Z::*)() const> : true_type {}; template <typename R, typename Z, typename A> struct is_member_function_pointer<R (Z::*)(A)> : true_type {}; template <typename R, typename Z, typename A> struct is_member_function_pointer<R (Z::*)(A) const> : true_type {}; template <typename R, typename Z, typename A, typename B> struct is_member_function_pointer<R (Z::*)(A, B)> : true_type {}; template <typename R, typename Z, typename A, typename B> struct is_member_function_pointer<R (Z::*)(A, B) const> : true_type {}; template <typename R, typename Z, typename A, typename B, typename C> struct is_member_function_pointer<R (Z::*)(A, B, C)> : true_type {}; template <typename R, typename Z, typename A, typename B, typename C> struct is_member_function_pointer<R (Z::*)(A, B, C) const> : true_type {}; template <typename R, typename Z, typename A, typename B, typename C, typename D> struct is_member_function_pointer<R (Z::*)(A, B, C, D)> : true_type {}; template <typename R, typename Z, typename A, typename B, typename C, typename D> struct is_member_function_pointer<R (Z::*)(A, B, C, D) const> : true_type {}; template <class T, class U> struct is_same : public false_type {}; template <class T> struct is_same<T, T> : true_type {}; template <class> struct is_array : public false_type {}; template <class T, size_t n> struct is_array<T[n]> : public true_type {}; template <class T> struct is_array<T[]> : public true_type {}; template <class T> struct is_non_const_reference : false_type {}; template <class T> struct is_non_const_reference<T&> : true_type {}; template <class T> struct is_non_const_reference<const T&> : false_type {}; template <class T> struct is_const : false_type {}; template <class T> struct is_const<const T> : true_type {}; template <class T> struct is_void : false_type {}; template <> struct is_void<void> : true_type {}; namespace cef_internal { // Types YesType and NoType are guaranteed such that sizeof(YesType) < // sizeof(NoType). typedef char YesType; struct NoType { YesType dummy[2]; }; // This class is an implementation detail for is_convertible, and you // don't need to know how it works to use is_convertible. For those // who care: we declare two different functions, one whose argument is // of type To and one with a variadic argument list. We give them // return types of different size, so we can use sizeof to trick the // compiler into telling us which function it would have chosen if we // had called it with an argument of type From. See Alexandrescu's // _Modern C++ Design_ for more details on this sort of trick. struct ConvertHelper { template <typename To> static YesType Test(To); template <typename To> static NoType Test(...); template <typename From> static From& Create(); }; // Used to determine if a type is a struct/union/class. Inspired by Boost's // is_class type_trait implementation. struct IsClassHelper { template <typename C> static YesType Test(void (C::*)(void)); template <typename C> static NoType Test(...); }; } // namespace cef_internal // Inherits from true_type if From is convertible to To, false_type otherwise. // // Note that if the type is convertible, this will be a true_type REGARDLESS // of whether or not the conversion would emit a warning. template <typename From, typename To> struct is_convertible : integral_constant<bool, sizeof(cef_internal::ConvertHelper::Test<To>( cef_internal::ConvertHelper::Create<From>())) == sizeof(cef_internal::YesType)> {}; template <typename T> struct is_class : integral_constant<bool, sizeof(cef_internal::IsClassHelper::Test<T>(0)) == sizeof(cef_internal::YesType)> {}; template <bool B, class T = void> struct enable_if {}; template <class T> struct enable_if<true, T> { typedef T type; }; } // namespace base #endif // !USING_CHROMIUM_INCLUDES #endif // CEF_INCLUDE_BASE_CEF_TEMPLATE_UTIL_H_