c++config (std::size_t, [...]): Provide typedefs.

[thirdparty/gcc.git] / libstdc++-v3 / include / tr1 / type_traits

// TR1 type_traits -*- C++ -*-

// Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010
// 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 tr1/type_traits
 *  This is a TR1 C++ Library header. 
 */

#ifndef _GLIBCXX_TR1_TYPE_TRAITS
#define _GLIBCXX_TR1_TYPE_TRAITS 1

#pragma GCC system_header

#if defined(_GLIBCXX_INCLUDE_AS_CXX0X)
#  error TR1 header cannot be included from C++0x header
#endif

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

#if defined(_GLIBCXX_INCLUDE_AS_TR1)
#  include <tr1_impl/type_traits>
#else
#  define _GLIBCXX_INCLUDE_AS_TR1
#  define _GLIBCXX_BEGIN_NAMESPACE_TR1 namespace tr1 {
#  define _GLIBCXX_END_NAMESPACE_TR1 }
#  define _GLIBCXX_TR1 tr1::
#  include <tr1_impl/type_traits>
#  undef _GLIBCXX_TR1
#  undef _GLIBCXX_END_NAMESPACE_TR1
#  undef _GLIBCXX_BEGIN_NAMESPACE_TR1
#  undef _GLIBCXX_INCLUDE_AS_TR1
#endif

namespace std
{
namespace tr1
{
#define _DEFINE_SPEC(_Trait, _Type)    \
  template<>                           \
    struct _Trait<_Type>	       \
    : public true_type { };

  template<typename>
    struct is_reference
    : public false_type { };

  template<typename _Tp>
    struct is_reference<_Tp&>
    : public true_type { };

  template<typename _Tp>
    struct is_pod
    : public integral_constant<bool, __is_pod(_Tp) || is_void<_Tp>::value>
    { };

  template<typename _Tp>
    struct has_trivial_constructor
    : public integral_constant<bool, is_pod<_Tp>::value>
    { };

  template<typename _Tp>
    struct has_trivial_copy
    : public integral_constant<bool, is_pod<_Tp>::value>
    { };

  template<typename _Tp>
    struct has_trivial_assign
    : public integral_constant<bool, is_pod<_Tp>::value>
    { };

  template<typename _Tp>
    struct has_trivial_destructor
    : public integral_constant<bool, is_pod<_Tp>::value>
    { };

  template<typename _Tp>
    struct has_nothrow_constructor
    : public integral_constant<bool, is_pod<_Tp>::value>
    { };

  template<typename _Tp>
    struct has_nothrow_copy
    : public integral_constant<bool, is_pod<_Tp>::value>
    { };

  template<typename _Tp>
    struct has_nothrow_assign
    : public integral_constant<bool, is_pod<_Tp>::value>
    { };

  template<typename>
    struct __is_signed_helper
    : public false_type { };
  _DEFINE_SPEC(__is_signed_helper, signed char)
  _DEFINE_SPEC(__is_signed_helper, short)
  _DEFINE_SPEC(__is_signed_helper, int)
  _DEFINE_SPEC(__is_signed_helper, long)
  _DEFINE_SPEC(__is_signed_helper, long long)

  template<typename _Tp>
    struct is_signed
    : public integral_constant<bool, (__is_signed_helper<typename
				      remove_cv<_Tp>::type>::value)>
    { };

  template<typename>
    struct __is_unsigned_helper
    : public false_type { };
  _DEFINE_SPEC(__is_unsigned_helper, unsigned char)
  _DEFINE_SPEC(__is_unsigned_helper, unsigned short)
  _DEFINE_SPEC(__is_unsigned_helper, unsigned int)
  _DEFINE_SPEC(__is_unsigned_helper, unsigned long)
  _DEFINE_SPEC(__is_unsigned_helper, unsigned long long)

  template<typename _Tp>
    struct is_unsigned
    : public integral_constant<bool, (__is_unsigned_helper<typename
				      remove_cv<_Tp>::type>::value)>
    { };

  template<typename _Base, typename _Derived>
    struct __is_base_of_helper
    {
      typedef typename remove_cv<_Base>::type    _NoCv_Base;
      typedef typename remove_cv<_Derived>::type _NoCv_Derived;
      static const bool __value = (is_same<_Base, _Derived>::value
				   || (__is_base_of(_Base, _Derived)
				       && !is_same<_NoCv_Base,
				                   _NoCv_Derived>::value));
    };
 
  template<typename _Base, typename _Derived>
    struct is_base_of
    : public integral_constant<bool,
			       __is_base_of_helper<_Base, _Derived>::__value>
    { };

  template<typename _From, typename _To>
    struct __is_convertible_simple
    : public __sfinae_types
    {
    private:
      static __one __test(_To);
      static __two __test(...);
      static _From __makeFrom();
    
    public:
      static const bool __value = sizeof(__test(__makeFrom())) == 1;
    };

  template<typename _Tp>
    struct add_reference;

  template<typename _Tp>
    struct __is_int_or_cref
    {
      typedef typename remove_reference<_Tp>::type __rr_Tp;
      static const bool __value = (is_integral<_Tp>::value
				   || (is_integral<__rr_Tp>::value
				       && is_const<__rr_Tp>::value
				       && !is_volatile<__rr_Tp>::value));
    };

  template<typename _From, typename _To,
	   bool = (is_void<_From>::value || is_void<_To>::value
		   || is_function<_To>::value || is_array<_To>::value
		   // This special case is here only to avoid warnings.	
		   || (is_floating_point<typename
		       remove_reference<_From>::type>::value
		       && __is_int_or_cref<_To>::__value))>
    struct __is_convertible_helper
    {
      // "An imaginary lvalue of type From...".
      static const bool __value = (__is_convertible_simple<typename
				   add_reference<_From>::type, _To>::__value);
    };

  template<typename _From, typename _To>
    struct __is_convertible_helper<_From, _To, true>
    { static const bool __value = (is_void<_To>::value
				   || (__is_int_or_cref<_To>::__value
				       && !is_void<_From>::value)); };

  template<typename _From, typename _To>
    struct is_convertible
    : public integral_constant<bool,
			       __is_convertible_helper<_From, _To>::__value>
    { };

  // reference modifications [4.7.2].
  template<typename _Tp>
    struct remove_reference
    { typedef _Tp     type; };

  template<typename _Tp>
    struct remove_reference<_Tp&>
    { typedef _Tp     type; };

  // NB: Careful with reference to void.
  template<typename _Tp, bool = (is_void<_Tp>::value
				 || is_reference<_Tp>::value)>
    struct __add_reference_helper
    { typedef _Tp&    type; };

  template<typename _Tp>
    struct __add_reference_helper<_Tp, true>
    { typedef _Tp     type; };

  template<typename _Tp>
    struct add_reference
    : public __add_reference_helper<_Tp>
    { };

  // other transformations [4.8].
  template<std::size_t _Len, std::size_t _Align>
    struct aligned_storage
    { 
      union type
      {
	unsigned char __data[_Len];
	struct __attribute__((__aligned__((_Align)))) { } __align; 
      };
    };

#undef _DEFINE_SPEC
}
}

#endif // _GLIBCXX_TR1_TYPE_TRAITS