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Diffstat (limited to 'Source/JavaScriptCore/wtf/TypeTraits.h')
| -rw-r--r-- | Source/JavaScriptCore/wtf/TypeTraits.h | 386 |
1 files changed, 386 insertions, 0 deletions
diff --git a/Source/JavaScriptCore/wtf/TypeTraits.h b/Source/JavaScriptCore/wtf/TypeTraits.h new file mode 100644 index 0000000..44103cd --- /dev/null +++ b/Source/JavaScriptCore/wtf/TypeTraits.h @@ -0,0 +1,386 @@ + /* + * 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 + // RemoveReference<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 + + template<typename T> struct IsFloatingPoint { static const bool value = false; }; + template<> struct IsFloatingPoint<float> { static const bool value = true; }; + template<> struct IsFloatingPoint<double> { static const bool value = true; }; + template<> struct IsFloatingPoint<long double> { static const bool value = true; }; + + template<typename T> struct IsArithmetic { static const bool value = IsInteger<T>::value || IsFloatingPoint<T>::value; }; + + // 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 = IsArithmetic<T>::value; }; + 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; + }; + + template <typename T> struct RemoveReference { + typedef T Type; + }; + + template <typename T> struct RemoveReference<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 |