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// 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(BUILDING_CEF_SHARED)

// When building CEF include the Chromium header directly.

#include "base/template_util.h"

#else // !BUILDING_CEF_SHARED

// 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 // !BUILDING_CEF_SHARED

#endif // CEF_INCLUDE_BASE_CEF_TEMPLATE_UTIL_H_

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