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cef_template_util.h
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// 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_