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Edit File : type_traits.h \| Size : 5.78 KB
// -- C++ -- // Copyright (C) 2005-2018 Free Software Foundation, Inc. // // This file is part of the GNU ISO C++ Library. This library is free // software; you can redistribute it and/or modify it under the terms // of the GNU General Public License as published by the Free Software // Foundation; either version 3, 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 // General Public License for more details. // Under Section 7 of GPL version 3, you are granted additional // permissions described in the GCC Runtime Library Exception, version // 3.1, as published by the Free Software Foundation. // You should have received a copy of the GNU General Public License and // a copy of the GCC Runtime Library Exception along with this program; // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see // <http://www.gnu.org/licenses/>. /** @file ext/type_traits.h * This file is a GNU extension to the Standard C++ Library. / #ifndef _EXT_TYPE_TRAITS #define _EXT_TYPE_TRAITS 1 #pragma GCC system_header #include <bits/c++config.h> #include <bits/cpp_type_traits.h> extern "C++" { namespace __gnu_cxx _GLIBCXX_VISIBILITY(default) { _GLIBCXX_BEGIN_NAMESPACE_VERSION // Define a nested type if some predicate holds. template<bool, typename> struct __enable_if { }; template<typename _Tp> struct __enable_if<true, _Tp> { typedef _Tp __type; }; // Conditional expression for types. If true, first, if false, second. template<bool _Cond, typename _Iftrue, typename _Iffalse> struct __conditional_type { typedef _Iftrue __type; }; template<typename _Iftrue, typename _Iffalse> struct __conditional_type<false, _Iftrue, _Iffalse> { typedef _Iffalse __type; }; // Given an integral builtin type, return the corresponding unsigned type. template<typename _Tp> struct __add_unsigned { private: typedef __enable_if<std::__is_integer<_Tp>::__value, _Tp> __if_type; public: typedef typename __if_type::__type __type; }; template<> struct __add_unsigned<char> { typedef unsigned char __type; }; template<> struct __add_unsigned<signed char> { typedef unsigned char __type; }; template<> struct __add_unsigned<short> { typedef unsigned short __type; }; template<> struct __add_unsigned<int> { typedef unsigned int __type; }; template<> struct __add_unsigned<long> { typedef unsigned long __type; }; template<> struct __add_unsigned<long long> { typedef unsigned long long __type; }; // Declare but don't define. template<> struct __add_unsigned<bool>; template<> struct __add_unsigned<wchar_t>; // Given an integral builtin type, return the corresponding signed type. template<typename _Tp> struct __remove_unsigned { private: typedef __enable_if<std::__is_integer<_Tp>::__value, _Tp> __if_type; public: typedef typename __if_type::__type __type; }; template<> struct __remove_unsigned<char> { typedef signed char __type; }; template<> struct __remove_unsigned<unsigned char> { typedef signed char __type; }; template<> struct __remove_unsigned<unsigned short> { typedef short __type; }; template<> struct __remove_unsigned<unsigned int> { typedef int __type; }; template<> struct __remove_unsigned<unsigned long> { typedef long __type; }; template<> struct __remove_unsigned<unsigned long long> { typedef long long __type; }; // Declare but don't define. template<> struct __remove_unsigned<bool>; template<> struct __remove_unsigned<wchar_t>; // For use in string and vstring. template<typename _Type> inline bool __is_null_pointer(_Type __ptr) { return __ptr == 0; } template<typename _Type> inline bool __is_null_pointer(_Type) { return false; } #if __cplusplus >= 201103L inline bool __is_null_pointer(std::nullptr_t) { return true; } #endif // For complex and cmath template<typename _Tp, bool = std::__is_integer<_Tp>::__value> struct __promote { typedef double __type; }; // No nested __type member for non-integer non-floating point types, // allows this type to be used for SFINAE to constrain overloads in // <cmath> and <complex> to only the intended types. template<typename _Tp> struct __promote<_Tp, false> { }; template<> struct __promote<long double> { typedef long double __type; }; template<> struct __promote<double> { typedef double __type; }; template<> struct __promote<float> { typedef float __type; }; template<typename _Tp, typename _Up, typename _Tp2 = typename __promote<_Tp>::__type, typename _Up2 = typename __promote<_Up>::__type> struct __promote_2 { typedef __typeof__(_Tp2() + _Up2()) __type; }; template<typename _Tp, typename _Up, typename _Vp, typename _Tp2 = typename __promote<_Tp>::__type, typename _Up2 = typename __promote<_Up>::__type, typename _Vp2 = typename __promote<_Vp>::__type> struct __promote_3 { typedef __typeof__(_Tp2() + _Up2() + _Vp2()) __type; }; template<typename _Tp, typename _Up, typename _Vp, typename _Wp, typename _Tp2 = typename __promote<_Tp>::__type, typename _Up2 = typename __promote<_Up>::__type, typename _Vp2 = typename __promote<_Vp>::__type, typename _Wp2 = typename __promote<_Wp>::__type> struct __promote_4 { typedef __typeof__(_Tp2() + _Up2() + _Vp2() + _Wp2()) __type; }; _GLIBCXX_END_NAMESPACE_VERSION } // namespace } // extern "C++" #endif Back

Edit File : type_traits.h | Size : 5.78 KB

// -*- C++ -*-

// Copyright (C) 2005-2018 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library.  This library is free
// software; you can redistribute it and/or modify it under the terms
// of the GNU General Public License as published by the Free Software
// Foundation; either version 3, 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
// General Public License for more details.

// Under Section 7 of GPL version 3, you are granted additional
// permissions described in the GCC Runtime Library Exception, version
// 3.1, as published by the Free Software Foundation.

// You should have received a copy of the GNU General Public License and
// a copy of the GCC Runtime Library Exception along with this program;
// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
// <http://www.gnu.org/licenses/>.

/** @file ext/type_traits.h
 *  This file is a GNU extension to the Standard C++ Library.
 */

#ifndef _EXT_TYPE_TRAITS
#define _EXT_TYPE_TRAITS 1

#pragma GCC system_header

#include <bits/c++config.h>
#include <bits/cpp_type_traits.h>

extern "C++" {

namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION

// Define a nested type if some predicate holds.
  template<bool, typename>
    struct __enable_if 
    { };

template<typename _Tp>
    struct __enable_if<true, _Tp>
    { typedef _Tp __type; };

// Conditional expression for types. If true, first, if false, second.
  template<bool _Cond, typename _Iftrue, typename _Iffalse>
    struct __conditional_type
    { typedef _Iftrue __type; };

template<typename _Iftrue, typename _Iffalse>
    struct __conditional_type<false, _Iftrue, _Iffalse>
    { typedef _Iffalse __type; };

// Given an integral builtin type, return the corresponding unsigned type.
  template<typename _Tp>
    struct __add_unsigned
    { 
    private:
      typedef __enable_if<std::__is_integer<_Tp>::__value, _Tp> __if_type;
      
    public:
      typedef typename __if_type::__type __type; 
    };

template<>
    struct __add_unsigned<char>
    { typedef unsigned char __type; };

template<>
    struct __add_unsigned<signed char>
    { typedef unsigned char __type; };

template<>
    struct __add_unsigned<short>
    { typedef unsigned short __type; };

template<>
    struct __add_unsigned<int>
    { typedef unsigned int __type; };

template<>
    struct __add_unsigned<long>
    { typedef unsigned long __type; };

template<>
    struct __add_unsigned<long long>
    { typedef unsigned long long __type; };

// Declare but don't define.
  template<>
    struct __add_unsigned<bool>;

template<>
    struct __add_unsigned<wchar_t>;

// Given an integral builtin type, return the corresponding signed type.
  template<typename _Tp>
    struct __remove_unsigned
    { 
    private:
      typedef __enable_if<std::__is_integer<_Tp>::__value, _Tp> __if_type;
      
    public:
      typedef typename __if_type::__type __type; 
    };

template<>
    struct __remove_unsigned<char>
    { typedef signed char __type; };

template<>
    struct __remove_unsigned<unsigned char>
    { typedef signed char __type; };

template<>
    struct __remove_unsigned<unsigned short>
    { typedef short __type; };

template<>
    struct __remove_unsigned<unsigned int>
    { typedef int __type; };

template<>
    struct __remove_unsigned<unsigned long>
    { typedef long __type; };

template<>
    struct __remove_unsigned<unsigned long long>
    { typedef long long __type; };

// Declare but don't define.
  template<>
    struct __remove_unsigned<bool>;

template<>
    struct __remove_unsigned<wchar_t>;

// For use in string and vstring.
  template<typename _Type>
    inline bool
    __is_null_pointer(_Type* __ptr)
    { return __ptr == 0; }

template<typename _Type>
    inline bool
    __is_null_pointer(_Type)
    { return false; }

#if __cplusplus >= 201103L
  inline bool
  __is_null_pointer(std::nullptr_t)
  { return true; }
#endif

// For complex and cmath
  template<typename _Tp, bool = std::__is_integer<_Tp>::__value>
    struct __promote
    { typedef double __type; };

// No nested __type member for non-integer non-floating point types,
  // allows this type to be used for SFINAE to constrain overloads in
  // <cmath> and <complex> to only the intended types.
  template<typename _Tp>
    struct __promote<_Tp, false>
    { };

template<>
    struct __promote<long double>
    { typedef long double __type; };

template<>
    struct __promote<double>
    { typedef double __type; };

template<>
    struct __promote<float>
    { typedef float __type; };

template<typename _Tp, typename _Up,
           typename _Tp2 = typename __promote<_Tp>::__type,
           typename _Up2 = typename __promote<_Up>::__type>
    struct __promote_2
    {
      typedef __typeof__(_Tp2() + _Up2()) __type;
    };

template<typename _Tp, typename _Up, typename _Vp,
           typename _Tp2 = typename __promote<_Tp>::__type,
           typename _Up2 = typename __promote<_Up>::__type,
           typename _Vp2 = typename __promote<_Vp>::__type>
    struct __promote_3
    {
      typedef __typeof__(_Tp2() + _Up2() + _Vp2()) __type;
    };

template<typename _Tp, typename _Up, typename _Vp, typename _Wp,
           typename _Tp2 = typename __promote<_Tp>::__type,
           typename _Up2 = typename __promote<_Up>::__type,
           typename _Vp2 = typename __promote<_Vp>::__type,
           typename _Wp2 = typename __promote<_Wp>::__type>
    struct __promote_4
    {
      typedef __typeof__(_Tp2() + _Up2() + _Vp2() + _Wp2()) __type;
    };

_GLIBCXX_END_NAMESPACE_VERSION
} // namespace
} // extern "C++"

#endif

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