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