/* | |
* Copyright (C) 2006, 2007, 2008 Apple Inc. All rights reserved. | |
* Copyright (C) 2009, 2010 Google Inc. All rights reserved. | |
* | |
* This library is free software; you can redistribute it and/or | |
* modify it under the terms of the GNU Library General Public | |
* License as published by the Free Software Foundation; either | |
* version 2 of the License, or (at your option) any later version. | |
* | |
* This library is distributed in the hope that it will be useful, | |
* but WITHOUT ANY WARRANTY; without even the implied warranty of | |
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
* Library General Public License for more details. | |
* | |
* You should have received a copy of the GNU Library General Public License | |
* along with this library; see the file COPYING.LIB. If not, write to | |
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, | |
* Boston, MA 02110-1301, USA. | |
* | |
*/ | |
#ifndef TypeTraits_h | |
#define TypeTraits_h | |
#include "Platform.h" | |
#if (defined(__GLIBCXX__) && (__GLIBCXX__ >= 20070724) && defined(__GXX_EXPERIMENTAL_CXX0X__)) || (defined(_MSC_VER) && (_MSC_VER >= 1600)) | |
#include <type_traits> | |
#endif | |
namespace WTF { | |
// The following are provided in this file: | |
// | |
// IsInteger<T>::value | |
// IsPod<T>::value, see the definition for a note about its limitations | |
// IsConvertibleToInteger<T>::value | |
// | |
// IsSameType<T, U>::value | |
// | |
// RemovePointer<T>::Type | |
// RemoveConst<T>::Type | |
// RemoveVolatile<T>::Type | |
// RemoveConstVolatile<T>::Type | |
// | |
// COMPILE_ASSERT's in TypeTraits.cpp illustrate their usage and what they do. | |
template<typename T> struct IsInteger { static const bool value = false; }; | |
template<> struct IsInteger<bool> { static const bool value = true; }; | |
template<> struct IsInteger<char> { static const bool value = true; }; | |
template<> struct IsInteger<signed char> { static const bool value = true; }; | |
template<> struct IsInteger<unsigned char> { static const bool value = true; }; | |
template<> struct IsInteger<short> { static const bool value = true; }; | |
template<> struct IsInteger<unsigned short> { static const bool value = true; }; | |
template<> struct IsInteger<int> { static const bool value = true; }; | |
template<> struct IsInteger<unsigned int> { static const bool value = true; }; | |
template<> struct IsInteger<long> { static const bool value = true; }; | |
template<> struct IsInteger<unsigned long> { static const bool value = true; }; | |
template<> struct IsInteger<long long> { static const bool value = true; }; | |
template<> struct IsInteger<unsigned long long> { static const bool value = true; }; | |
#if !COMPILER(MSVC) || defined(_NATIVE_WCHAR_T_DEFINED) | |
template<> struct IsInteger<wchar_t> { static const bool value = true; }; | |
#endif | |
// IsPod is misnamed as it doesn't cover all plain old data (pod) types. | |
// Specifically, it doesn't allow for enums or for structs. | |
template <typename T> struct IsPod { static const bool value = IsInteger<T>::value; }; | |
template <> struct IsPod<float> { static const bool value = true; }; | |
template <> struct IsPod<double> { static const bool value = true; }; | |
template <> struct IsPod<long double> { static const bool value = true; }; | |
template <typename P> struct IsPod<P*> { static const bool value = true; }; | |
template<typename T> class IsConvertibleToInteger { | |
// Avoid "possible loss of data" warning when using Microsoft's C++ compiler | |
// by not converting int's to doubles. | |
template<bool performCheck, typename U> class IsConvertibleToDouble; | |
template<typename U> class IsConvertibleToDouble<false, U> { | |
public: | |
static const bool value = false; | |
}; | |
template<typename U> class IsConvertibleToDouble<true, U> { | |
typedef char YesType; | |
struct NoType { | |
char padding[8]; | |
}; | |
static YesType floatCheck(long double); | |
static NoType floatCheck(...); | |
static T& t; | |
public: | |
static const bool value = sizeof(floatCheck(t)) == sizeof(YesType); | |
}; | |
public: | |
static const bool value = IsInteger<T>::value || IsConvertibleToDouble<!IsInteger<T>::value, T>::value; | |
}; | |
template <typename T, typename U> struct IsSameType { | |
static const bool value = false; | |
}; | |
template <typename T> struct IsSameType<T, T> { | |
static const bool value = true; | |
}; | |
template <typename T, typename U> class IsSubclass { | |
typedef char YesType; | |
struct NoType { | |
char padding[8]; | |
}; | |
static YesType subclassCheck(U*); | |
static NoType subclassCheck(...); | |
static T* t; | |
public: | |
static const bool value = sizeof(subclassCheck(t)) == sizeof(YesType); | |
}; | |
template <typename T, template<class V> class U> class IsSubclassOfTemplate { | |
typedef char YesType; | |
struct NoType { | |
char padding[8]; | |
}; | |
template<typename W> static YesType subclassCheck(U<W>*); | |
static NoType subclassCheck(...); | |
static T* t; | |
public: | |
static const bool value = sizeof(subclassCheck(t)) == sizeof(YesType); | |
}; | |
template <typename T, template <class V> class OuterTemplate> struct RemoveTemplate { | |
typedef T Type; | |
}; | |
template <typename T, template <class V> class OuterTemplate> struct RemoveTemplate<OuterTemplate<T>, OuterTemplate> { | |
typedef T Type; | |
}; | |
template <typename T> struct RemoveConst { | |
typedef T Type; | |
}; | |
template <typename T> struct RemoveConst<const T> { | |
typedef T Type; | |
}; | |
template <typename T> struct RemoveVolatile { | |
typedef T Type; | |
}; | |
template <typename T> struct RemoveVolatile<volatile T> { | |
typedef T Type; | |
}; | |
template <typename T> struct RemoveConstVolatile { | |
typedef typename RemoveVolatile<typename RemoveConst<T>::Type>::Type Type; | |
}; | |
template <typename T> struct RemovePointer { | |
typedef T Type; | |
}; | |
template <typename T> struct RemovePointer<T*> { | |
typedef T Type; | |
}; | |
#if (defined(__GLIBCXX__) && (__GLIBCXX__ >= 20070724) && defined(__GXX_EXPERIMENTAL_CXX0X__)) || (defined(_MSC_VER) && (_MSC_VER >= 1600)) | |
// GCC's libstdc++ 20070724 and later supports C++ TR1 type_traits in the std namespace. | |
// VC10 (VS2010) and later support C++ TR1 type_traits in the std::tr1 namespace. | |
template<typename T> struct HasTrivialConstructor : public std::tr1::has_trivial_constructor<T> { }; | |
template<typename T> struct HasTrivialDestructor : public std::tr1::has_trivial_destructor<T> { }; | |
#else | |
// This compiler doesn't provide type traits, so we provide basic HasTrivialConstructor | |
// and HasTrivialDestructor definitions. The definitions here include most built-in | |
// scalar types but do not include POD structs and classes. For the intended purposes of | |
// type_traits this results correct but potentially less efficient code. | |
template <typename T, T v> | |
struct IntegralConstant { | |
static const T value = v; | |
typedef T value_type; | |
typedef IntegralConstant<T, v> type; | |
}; | |
typedef IntegralConstant<bool, true> true_type; | |
typedef IntegralConstant<bool, false> false_type; | |
#if defined(_MSC_VER) && (_MSC_VER >= 1400) && !defined(__INTEL_COMPILER) | |
// VC8 (VS2005) and later have built-in compiler support for HasTrivialConstructor / HasTrivialDestructor, | |
// but for some unexplained reason it doesn't work on built-in types. | |
template <typename T> struct HasTrivialConstructor : public IntegralConstant<bool, __has_trivial_constructor(T)>{ }; | |
template <typename T> struct HasTrivialDestructor : public IntegralConstant<bool, __has_trivial_destructor(T)>{ }; | |
#else | |
template <typename T> struct HasTrivialConstructor : public false_type{ }; | |
template <typename T> struct HasTrivialDestructor : public false_type{ }; | |
#endif | |
template <typename T> struct HasTrivialConstructor<T*> : public true_type{ }; | |
template <typename T> struct HasTrivialDestructor<T*> : public true_type{ }; | |
template <> struct HasTrivialConstructor<float> : public true_type{ }; | |
template <> struct HasTrivialConstructor<const float> : public true_type{ }; | |
template <> struct HasTrivialConstructor<volatile float> : public true_type{ }; | |
template <> struct HasTrivialConstructor<const volatile float> : public true_type{ }; | |
template <> struct HasTrivialConstructor<double> : public true_type{ }; | |
template <> struct HasTrivialConstructor<const double> : public true_type{ }; | |
template <> struct HasTrivialConstructor<volatile double> : public true_type{ }; | |
template <> struct HasTrivialConstructor<const volatile double> : public true_type{ }; | |
template <> struct HasTrivialConstructor<long double> : public true_type{ }; | |
template <> struct HasTrivialConstructor<const long double> : public true_type{ }; | |
template <> struct HasTrivialConstructor<volatile long double> : public true_type{ }; | |
template <> struct HasTrivialConstructor<const volatile long double> : public true_type{ }; | |
template <> struct HasTrivialConstructor<unsigned char> : public true_type{ }; | |
template <> struct HasTrivialConstructor<const unsigned char> : public true_type{ }; | |
template <> struct HasTrivialConstructor<volatile unsigned char> : public true_type{ }; | |
template <> struct HasTrivialConstructor<const volatile unsigned char> : public true_type{ }; | |
template <> struct HasTrivialConstructor<unsigned short> : public true_type{ }; | |
template <> struct HasTrivialConstructor<const unsigned short> : public true_type{ }; | |
template <> struct HasTrivialConstructor<volatile unsigned short> : public true_type{ }; | |
template <> struct HasTrivialConstructor<const volatile unsigned short> : public true_type{ }; | |
template <> struct HasTrivialConstructor<unsigned int> : public true_type{ }; | |
template <> struct HasTrivialConstructor<const unsigned int> : public true_type{ }; | |
template <> struct HasTrivialConstructor<volatile unsigned int> : public true_type{ }; | |
template <> struct HasTrivialConstructor<const volatile unsigned int> : public true_type{ }; | |
template <> struct HasTrivialConstructor<unsigned long> : public true_type{ }; | |
template <> struct HasTrivialConstructor<const unsigned long> : public true_type{ }; | |
template <> struct HasTrivialConstructor<volatile unsigned long> : public true_type{ }; | |
template <> struct HasTrivialConstructor<const volatile unsigned long> : public true_type{ }; | |
template <> struct HasTrivialConstructor<unsigned long long> : public true_type{ }; | |
template <> struct HasTrivialConstructor<const unsigned long long> : public true_type{ }; | |
template <> struct HasTrivialConstructor<volatile unsigned long long> : public true_type{ }; | |
template <> struct HasTrivialConstructor<const volatile unsigned long long> : public true_type{ }; | |
template <> struct HasTrivialConstructor<signed char> : public true_type{ }; | |
template <> struct HasTrivialConstructor<const signed char> : public true_type{ }; | |
template <> struct HasTrivialConstructor<volatile signed char> : public true_type{ }; | |
template <> struct HasTrivialConstructor<const volatile signed char> : public true_type{ }; | |
template <> struct HasTrivialConstructor<signed short> : public true_type{ }; | |
template <> struct HasTrivialConstructor<const signed short> : public true_type{ }; | |
template <> struct HasTrivialConstructor<volatile signed short> : public true_type{ }; | |
template <> struct HasTrivialConstructor<const volatile signed short> : public true_type{ }; | |
template <> struct HasTrivialConstructor<signed int> : public true_type{ }; | |
template <> struct HasTrivialConstructor<const signed int> : public true_type{ }; | |
template <> struct HasTrivialConstructor<volatile signed int> : public true_type{ }; | |
template <> struct HasTrivialConstructor<const volatile signed int> : public true_type{ }; | |
template <> struct HasTrivialConstructor<signed long> : public true_type{ }; | |
template <> struct HasTrivialConstructor<const signed long> : public true_type{ }; | |
template <> struct HasTrivialConstructor<volatile signed long> : public true_type{ }; | |
template <> struct HasTrivialConstructor<const volatile signed long> : public true_type{ }; | |
template <> struct HasTrivialConstructor<signed long long> : public true_type{ }; | |
template <> struct HasTrivialConstructor<const signed long long> : public true_type{ }; | |
template <> struct HasTrivialConstructor<volatile signed long long> : public true_type{ }; | |
template <> struct HasTrivialConstructor<const volatile signed long long> : public true_type{ }; | |
template <> struct HasTrivialConstructor<bool> : public true_type{ }; | |
template <> struct HasTrivialConstructor<const bool> : public true_type{ }; | |
template <> struct HasTrivialConstructor<volatile bool> : public true_type{ }; | |
template <> struct HasTrivialConstructor<const volatile bool> : public true_type{ }; | |
template <> struct HasTrivialConstructor<char> : public true_type{ }; | |
template <> struct HasTrivialConstructor<const char> : public true_type{ }; | |
template <> struct HasTrivialConstructor<volatile char> : public true_type{ }; | |
template <> struct HasTrivialConstructor<const volatile char> : public true_type{ }; | |
#if !defined(_MSC_VER) || defined(_NATIVE_WCHAR_T_DEFINED) | |
template <> struct HasTrivialConstructor<wchar_t> : public true_type{ }; | |
template <> struct HasTrivialConstructor<const wchar_t> : public true_type{ }; | |
template <> struct HasTrivialConstructor<volatile wchar_t> : public true_type{ }; | |
template <> struct HasTrivialConstructor<const volatile wchar_t> : public true_type{ }; | |
#endif | |
template <> struct HasTrivialDestructor<float> : public true_type{ }; | |
template <> struct HasTrivialDestructor<const float> : public true_type{ }; | |
template <> struct HasTrivialDestructor<volatile float> : public true_type{ }; | |
template <> struct HasTrivialDestructor<const volatile float> : public true_type{ }; | |
template <> struct HasTrivialDestructor<double> : public true_type{ }; | |
template <> struct HasTrivialDestructor<const double> : public true_type{ }; | |
template <> struct HasTrivialDestructor<volatile double> : public true_type{ }; | |
template <> struct HasTrivialDestructor<const volatile double> : public true_type{ }; | |
template <> struct HasTrivialDestructor<long double> : public true_type{ }; | |
template <> struct HasTrivialDestructor<const long double> : public true_type{ }; | |
template <> struct HasTrivialDestructor<volatile long double> : public true_type{ }; | |
template <> struct HasTrivialDestructor<const volatile long double> : public true_type{ }; | |
template <> struct HasTrivialDestructor<unsigned char> : public true_type{ }; | |
template <> struct HasTrivialDestructor<const unsigned char> : public true_type{ }; | |
template <> struct HasTrivialDestructor<volatile unsigned char> : public true_type{ }; | |
template <> struct HasTrivialDestructor<const volatile unsigned char> : public true_type{ }; | |
template <> struct HasTrivialDestructor<unsigned short> : public true_type{ }; | |
template <> struct HasTrivialDestructor<const unsigned short> : public true_type{ }; | |
template <> struct HasTrivialDestructor<volatile unsigned short> : public true_type{ }; | |
template <> struct HasTrivialDestructor<const volatile unsigned short> : public true_type{ }; | |
template <> struct HasTrivialDestructor<unsigned int> : public true_type{ }; | |
template <> struct HasTrivialDestructor<const unsigned int> : public true_type{ }; | |
template <> struct HasTrivialDestructor<volatile unsigned int> : public true_type{ }; | |
template <> struct HasTrivialDestructor<const volatile unsigned int> : public true_type{ }; | |
template <> struct HasTrivialDestructor<unsigned long> : public true_type{ }; | |
template <> struct HasTrivialDestructor<const unsigned long> : public true_type{ }; | |
template <> struct HasTrivialDestructor<volatile unsigned long> : public true_type{ }; | |
template <> struct HasTrivialDestructor<const volatile unsigned long> : public true_type{ }; | |
template <> struct HasTrivialDestructor<unsigned long long> : public true_type{ }; | |
template <> struct HasTrivialDestructor<const unsigned long long> : public true_type{ }; | |
template <> struct HasTrivialDestructor<volatile unsigned long long> : public true_type{ }; | |
template <> struct HasTrivialDestructor<const volatile unsigned long long> : public true_type{ }; | |
template <> struct HasTrivialDestructor<signed char> : public true_type{ }; | |
template <> struct HasTrivialDestructor<const signed char> : public true_type{ }; | |
template <> struct HasTrivialDestructor<volatile signed char> : public true_type{ }; | |
template <> struct HasTrivialDestructor<const volatile signed char> : public true_type{ }; | |
template <> struct HasTrivialDestructor<signed short> : public true_type{ }; | |
template <> struct HasTrivialDestructor<const signed short> : public true_type{ }; | |
template <> struct HasTrivialDestructor<volatile signed short> : public true_type{ }; | |
template <> struct HasTrivialDestructor<const volatile signed short> : public true_type{ }; | |
template <> struct HasTrivialDestructor<signed int> : public true_type{ }; | |
template <> struct HasTrivialDestructor<const signed int> : public true_type{ }; | |
template <> struct HasTrivialDestructor<volatile signed int> : public true_type{ }; | |
template <> struct HasTrivialDestructor<const volatile signed int> : public true_type{ }; | |
template <> struct HasTrivialDestructor<signed long> : public true_type{ }; | |
template <> struct HasTrivialDestructor<const signed long> : public true_type{ }; | |
template <> struct HasTrivialDestructor<volatile signed long> : public true_type{ }; | |
template <> struct HasTrivialDestructor<const volatile signed long> : public true_type{ }; | |
template <> struct HasTrivialDestructor<signed long long> : public true_type{ }; | |
template <> struct HasTrivialDestructor<const signed long long> : public true_type{ }; | |
template <> struct HasTrivialDestructor<volatile signed long long> : public true_type{ }; | |
template <> struct HasTrivialDestructor<const volatile signed long long> : public true_type{ }; | |
template <> struct HasTrivialDestructor<bool> : public true_type{ }; | |
template <> struct HasTrivialDestructor<const bool> : public true_type{ }; | |
template <> struct HasTrivialDestructor<volatile bool> : public true_type{ }; | |
template <> struct HasTrivialDestructor<const volatile bool> : public true_type{ }; | |
template <> struct HasTrivialDestructor<char> : public true_type{ }; | |
template <> struct HasTrivialDestructor<const char> : public true_type{ }; | |
template <> struct HasTrivialDestructor<volatile char> : public true_type{ }; | |
template <> struct HasTrivialDestructor<const volatile char> : public true_type{ }; | |
#if !defined(_MSC_VER) || defined(_NATIVE_WCHAR_T_DEFINED) | |
template <> struct HasTrivialDestructor<wchar_t> : public true_type{ }; | |
template <> struct HasTrivialDestructor<const wchar_t> : public true_type{ }; | |
template <> struct HasTrivialDestructor<volatile wchar_t> : public true_type{ }; | |
template <> struct HasTrivialDestructor<const volatile wchar_t> : public true_type{ }; | |
#endif | |
#endif // __GLIBCXX__, etc. | |
} // namespace WTF | |
#endif // TypeTraits_h |