// C++0x type_traits -*- C++ -*-
// Copyright (C) 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 include/type_traits
* This is a Standard C++ Library header.
*/
#ifndef _GLIBCXX_TYPE_TRAITS
#define _GLIBCXX_TYPE_TRAITS 1
#pragma GCC system_header
#ifndef __GXX_EXPERIMENTAL_CXX0X__
# include <bits/c++0x_warning.h>
#else
#include <bits/c++config.h>
namespace std _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION
/**
* @addtogroup metaprogramming
* @{
*/
struct __sfinae_types
{
typedef char __one;
typedef struct { char __arr[2]; } __two;
};
#define _DEFINE_SPEC_0_HELPER \
template<>
#define _DEFINE_SPEC_1_HELPER \
template<typename _Tp>
#define _DEFINE_SPEC_2_HELPER \
template<typename _Tp, typename _Cp>
#define _DEFINE_SPEC(_Order, _Trait, _Type, _Value) \
_DEFINE_SPEC_##_Order##_HELPER \
struct _Trait<_Type> \
: public integral_constant<bool, _Value> { };
// helper classes.
/// integral_constant
template<typename _Tp, _Tp __v>
struct integral_constant
{
static constexpr _Tp value = __v;
typedef _Tp value_type;
typedef integral_constant<_Tp, __v> type;
constexpr operator value_type() { return value; }
};
/// typedef for true_type
typedef integral_constant<bool, true> true_type;
/// typedef for false_type
typedef integral_constant<bool, false> false_type;
template<typename _Tp, _Tp __v>
constexpr _Tp integral_constant<_Tp, __v>::value;
/// remove_cv
template<typename>
struct remove_cv;
template<typename>
struct __is_void_helper
: public false_type { };
_DEFINE_SPEC(0, __is_void_helper, void, true)
// primary type categories.
/// is_void
template<typename _Tp>
struct is_void
: public integral_constant<bool, (__is_void_helper<typename
remove_cv<_Tp>::type>::value)>
{ };
template<typename>
struct __is_integral_helper
: public false_type { };
_DEFINE_SPEC(0, __is_integral_helper, bool, true)
_DEFINE_SPEC(0, __is_integral_helper, char, true)
_DEFINE_SPEC(0, __is_integral_helper, signed char, true)
_DEFINE_SPEC(0, __is_integral_helper, unsigned char, true)
#ifdef _GLIBCXX_USE_WCHAR_T
_DEFINE_SPEC(0, __is_integral_helper, wchar_t, true)
#endif
_DEFINE_SPEC(0, __is_integral_helper, char16_t, true)
_DEFINE_SPEC(0, __is_integral_helper, char32_t, true)
_DEFINE_SPEC(0, __is_integral_helper, short, true)
_DEFINE_SPEC(0, __is_integral_helper, unsigned short, true)
_DEFINE_SPEC(0, __is_integral_helper, int, true)
_DEFINE_SPEC(0, __is_integral_helper, unsigned int, true)
_DEFINE_SPEC(0, __is_integral_helper, long, true)
_DEFINE_SPEC(0, __is_integral_helper, unsigned long, true)
_DEFINE_SPEC(0, __is_integral_helper, long long, true)
_DEFINE_SPEC(0, __is_integral_helper, unsigned long long, true)
/// is_integral
template<typename _Tp>
struct is_integral
: public integral_constant<bool, (__is_integral_helper<typename
remove_cv<_Tp>::type>::value)>
{ };
template<typename>
struct __is_floating_point_helper
: public false_type { };
_DEFINE_SPEC(0, __is_floating_point_helper, float, true)
_DEFINE_SPEC(0, __is_floating_point_helper, double, true)
_DEFINE_SPEC(0, __is_floating_point_helper, long double, true)
/// is_floating_point
template<typename _Tp>
struct is_floating_point
: public integral_constant<bool, (__is_floating_point_helper<typename
remove_cv<_Tp>::type>::value)>
{ };
/// is_array
template<typename>
struct is_array
: public false_type { };
template<typename _Tp, std::size_t _Size>
struct is_array<_Tp[_Size]>
: public true_type { };
template<typename _Tp>
struct is_array<_Tp[]>
: public true_type { };
template<typename>
struct __is_pointer_helper
: public false_type { };
_DEFINE_SPEC(1, __is_pointer_helper, _Tp*, true)
/// is_pointer
template<typename _Tp>
struct is_pointer
: public integral_constant<bool, (__is_pointer_helper<typename
remove_cv<_Tp>::type>::value)>
{ };
/// is_reference
template<typename _Tp>
struct is_reference;
/// is_function
template<typename _Tp>
struct is_function;
template<typename>
struct __is_member_object_pointer_helper
: public false_type { };
_DEFINE_SPEC(2, __is_member_object_pointer_helper, _Tp _Cp::*,
!is_function<_Tp>::value)
/// is_member_object_pointer
template<typename _Tp>
struct is_member_object_pointer
: public integral_constant<bool, (__is_member_object_pointer_helper<
typename remove_cv<_Tp>::type>::value)>
{ };
template<typename>
struct __is_member_function_pointer_helper
: public false_type { };
_DEFINE_SPEC(2, __is_member_function_pointer_helper, _Tp _Cp::*,
is_function<_Tp>::value)
/// is_member_function_pointer
template<typename _Tp>
struct is_member_function_pointer
: public integral_constant<bool, (__is_member_function_pointer_helper<
typename remove_cv<_Tp>::type>::value)>
{ };
/// is_enum
template<typename _Tp>
struct is_enum
: public integral_constant<bool, __is_enum(_Tp)>
{ };
/// is_union
template<typename _Tp>
struct is_union
: public integral_constant<bool, __is_union(_Tp)>
{ };
/// is_class
template<typename _Tp>
struct is_class
: public integral_constant<bool, __is_class(_Tp)>
{ };
/// is_function
template<typename>
struct is_function
: public false_type { };
template<typename _Res, typename... _ArgTypes>
struct is_function<_Res(_ArgTypes...)>
: public true_type { };
template<typename _Res, typename... _ArgTypes>
struct is_function<_Res(_ArgTypes......)>
: public true_type { };
template<typename _Res, typename... _ArgTypes>
struct is_function<_Res(_ArgTypes...) const>
: public true_type { };
template<typename _Res, typename... _ArgTypes>
struct is_function<_Res(_ArgTypes......) const>
: public true_type { };
template<typename _Res, typename... _ArgTypes>
struct is_function<_Res(_ArgTypes...) volatile>
: public true_type { };
template<typename _Res, typename... _ArgTypes>
struct is_function<_Res(_ArgTypes......) volatile>
: public true_type { };
template<typename _Res, typename... _ArgTypes>
struct is_function<_Res(_ArgTypes...) const volatile>
: public true_type { };
template<typename _Res, typename... _ArgTypes>
struct is_function<_Res(_ArgTypes......) const volatile>
: public true_type { };
template<typename>
struct __is_nullptr_t_helper
: public false_type { };
_DEFINE_SPEC(0, __is_nullptr_t_helper, std::nullptr_t, true)
// __is_nullptr_t (extension).
template<typename _Tp>
struct __is_nullptr_t
: public integral_constant<bool, (__is_nullptr_t_helper<typename
remove_cv<_Tp>::type>::value)>
{ };
// composite type traits.
/// is_arithmetic
template<typename _Tp>
struct is_arithmetic
: public integral_constant<bool, (is_integral<_Tp>::value
|| is_floating_point<_Tp>::value)>
{ };
/// is_fundamental
template<typename _Tp>
struct is_fundamental
: public integral_constant<bool, (is_arithmetic<_Tp>::value
|| is_void<_Tp>::value)>
{ };
/// is_object
template<typename _Tp>
struct is_object
: public integral_constant<bool, !(is_function<_Tp>::value
|| is_reference<_Tp>::value
|| is_void<_Tp>::value)>
{ };
/// is_member_pointer
template<typename _Tp>
struct is_member_pointer;
/// is_scalar
template<typename _Tp>
struct is_scalar
: public integral_constant<bool, (is_arithmetic<_Tp>::value
|| is_enum<_Tp>::value
|| is_pointer<_Tp>::value
|| is_member_pointer<_Tp>::value
|| __is_nullptr_t<_Tp>::value)>
{ };
/// is_compound
template<typename _Tp>
struct is_compound
: public integral_constant<bool, !is_fundamental<_Tp>::value> { };
/// is_member_pointer
template<typename _Tp>
struct __is_member_pointer_helper
: public false_type { };
_DEFINE_SPEC(2, __is_member_pointer_helper, _Tp _Cp::*, true)
template<typename _Tp>
struct is_member_pointer
: public integral_constant<bool, (__is_member_pointer_helper<
typename remove_cv<_Tp>::type>::value)>
{ };
// type properties.
/// is_const
template<typename>
struct is_const
: public false_type { };
template<typename _Tp>
struct is_const<_Tp const>
: public true_type { };
/// is_volatile
template<typename>
struct is_volatile
: public false_type { };
template<typename _Tp>
struct is_volatile<_Tp volatile>
: public true_type { };
/// is_empty
template<typename _Tp>
struct is_empty
: public integral_constant<bool, __is_empty(_Tp)>
{ };
/// is_polymorphic
template<typename _Tp>
struct is_polymorphic
: public integral_constant<bool, __is_polymorphic(_Tp)>
{ };
/// is_abstract
template<typename _Tp>
struct is_abstract
: public integral_constant<bool, __is_abstract(_Tp)>
{ };
/// has_virtual_destructor
template<typename _Tp>
struct has_virtual_destructor
: public integral_constant<bool, __has_virtual_destructor(_Tp)>
{ };
/// alignment_of
template<typename _Tp>
struct alignment_of
: public integral_constant<std::size_t, __alignof__(_Tp)> { };
/// rank
template<typename>
struct rank
: public integral_constant<std::size_t, 0> { };
template<typename _Tp, std::size_t _Size>
struct rank<_Tp[_Size]>
: public integral_constant<std::size_t, 1 + rank<_Tp>::value> { };
template<typename _Tp>
struct rank<_Tp[]>
: public integral_constant<std::size_t, 1 + rank<_Tp>::value> { };
/// extent
template<typename, unsigned _Uint = 0>
struct extent
: public integral_constant<std::size_t, 0> { };
template<typename _Tp, unsigned _Uint, std::size_t _Size>
struct extent<_Tp[_Size], _Uint>
: public integral_constant<std::size_t,
_Uint == 0 ? _Size : extent<_Tp,
_Uint - 1>::value>
{ };
template<typename _Tp, unsigned _Uint>
struct extent<_Tp[], _Uint>
: public integral_constant<std::size_t,
_Uint == 0 ? 0 : extent<_Tp,
_Uint - 1>::value>
{ };
// relationships between types [4.6].
/// is_same
template<typename, typename>
struct is_same
: public false_type { };
template<typename _Tp>
struct is_same<_Tp, _Tp>
: public true_type { };
// const-volatile modifications [4.7.1].
/// remove_const
template<typename _Tp>
struct remove_const
{ typedef _Tp type; };
template<typename _Tp>
struct remove_const<_Tp const>
{ typedef _Tp type; };
/// remove_volatile
template<typename _Tp>
struct remove_volatile
{ typedef _Tp type; };
template<typename _Tp>
struct remove_volatile<_Tp volatile>
{ typedef _Tp type; };
/// remove_cv
template<typename _Tp>
struct remove_cv
{
typedef typename
remove_const<typename remove_volatile<_Tp>::type>::type type;
};
/// add_const
template<typename _Tp>
struct add_const
{ typedef _Tp const type; };
/// add_volatile
template<typename _Tp>
struct add_volatile
{ typedef _Tp volatile type; };
/// add_cv
template<typename _Tp>
struct add_cv
{
typedef typename
add_const<typename add_volatile<_Tp>::type>::type type;
};
// array modifications.
/// remove_extent
template<typename _Tp>
struct remove_extent
{ typedef _Tp type; };
template<typename _Tp, std::size_t _Size>
struct remove_extent<_Tp[_Size]>
{ typedef _Tp type; };
template<typename _Tp>
struct remove_extent<_Tp[]>
{ typedef _Tp type; };
/// remove_all_extents
template<typename _Tp>
struct remove_all_extents
{ typedef _Tp type; };
template<typename _Tp, std::size_t _Size>
struct remove_all_extents<_Tp[_Size]>
{ typedef typename remove_all_extents<_Tp>::type type; };
template<typename _Tp>
struct remove_all_extents<_Tp[]>
{ typedef typename remove_all_extents<_Tp>::type type; };
// pointer modifications.
template<typename _Tp, typename>
struct __remove_pointer_helper
{ typedef _Tp type; };
template<typename _Tp, typename _Up>
struct __remove_pointer_helper<_Tp, _Up*>
{ typedef _Up type; };
/// remove_pointer
template<typename _Tp>
struct remove_pointer
: public __remove_pointer_helper<_Tp, typename remove_cv<_Tp>::type>
{ };
template<typename>
struct remove_reference;
/// add_pointer
template<typename _Tp>
struct add_pointer
{ typedef typename remove_reference<_Tp>::type* type; };
// Primary classification traits.
/// is_lvalue_reference
template<typename>
struct is_lvalue_reference
: public false_type { };
template<typename _Tp>
struct is_lvalue_reference<_Tp&>
: public true_type { };
/// is_rvalue_reference
template<typename>
struct is_rvalue_reference
: public false_type { };
template<typename _Tp>
struct is_rvalue_reference<_Tp&&>
: public true_type { };
// Secondary classification traits.
/// is_reference
template<typename _Tp>
struct is_reference
: public integral_constant<bool, (is_lvalue_reference<_Tp>::value
|| is_rvalue_reference<_Tp>::value)>
{ };
// Reference transformations.
/// remove_reference
template<typename _Tp>
struct remove_reference
{ typedef _Tp type; };
template<typename _Tp>
struct remove_reference<_Tp&>
{ typedef _Tp type; };
template<typename _Tp>
struct remove_reference<_Tp&&>
{ typedef _Tp type; };
template<typename _Tp,
bool = !is_reference<_Tp>::value && !is_void<_Tp>::value,
bool = is_rvalue_reference<_Tp>::value>
struct __add_lvalue_reference_helper
{ typedef _Tp type; };
template<typename _Tp>
struct __add_lvalue_reference_helper<_Tp, true, false>
{ typedef _Tp& type; };
template<typename _Tp>
struct __add_lvalue_reference_helper<_Tp, false, true>
{ typedef typename remove_reference<_Tp>::type& type; };
/// add_lvalue_reference
template<typename _Tp>
struct add_lvalue_reference
: public __add_lvalue_reference_helper<_Tp>
{ };
template<typename _Tp,
bool = !is_reference<_Tp>::value && !is_void<_Tp>::value>
struct __add_rvalue_reference_helper
{ typedef _Tp type; };
template<typename _Tp>
struct __add_rvalue_reference_helper<_Tp, true>
{ typedef _Tp&& type; };
/// add_rvalue_reference
template<typename _Tp>
struct add_rvalue_reference
: public __add_rvalue_reference_helper<_Tp>
{ };
// Scalar properties and transformations.
template<typename _Tp,
bool = is_integral<_Tp>::value,
bool = is_floating_point<_Tp>::value>
struct __is_signed_helper
: public false_type { };
template<typename _Tp>
struct __is_signed_helper<_Tp, false, true>
: public true_type { };
template<typename _Tp>
struct __is_signed_helper<_Tp, true, false>
: public integral_constant<bool, static_cast<bool>(_Tp(-1) < _Tp(0))>
{ };
/// is_signed
template<typename _Tp>
struct is_signed
: public integral_constant<bool, __is_signed_helper<_Tp>::value>
{ };
/// is_unsigned
template<typename _Tp>
struct is_unsigned
: public integral_constant<bool, (is_arithmetic<_Tp>::value
&& !is_signed<_Tp>::value)>
{ };
// Member introspection.
/// is_trivial
template<typename _Tp>
struct is_trivial
: public integral_constant<bool, __is_trivial(_Tp)>
{ };
/// is_standard_layout
template<typename _Tp>
struct is_standard_layout
: public integral_constant<bool, __is_standard_layout(_Tp)>
{ };
/// is_pod
// Could use is_standard_layout && is_trivial instead of the builtin.
template<typename _Tp>
struct is_pod
: public integral_constant<bool, __is_pod(_Tp)>
{ };
/// is_literal_type
template<typename _Tp>
struct is_literal_type
: public integral_constant<bool, __is_literal_type(_Tp)>
{ };
template<typename _Tp>
typename add_rvalue_reference<_Tp>::type declval() noexcept;
template<typename _Tp, typename... _Args>
class __is_constructible_helper
: public __sfinae_types
{
template<typename _Tp1, typename... _Args1>
static decltype(_Tp1(declval<_Args1>()...), __one()) __test(int);
template<typename, typename...>
static __two __test(...);
public:
static const bool __value = sizeof(__test<_Tp, _Args...>(0)) == 1;
};
template<typename _Tp, typename _Arg>
class __is_constructible_helper<_Tp, _Arg>
: public __sfinae_types
{
template<typename _Tp1, typename _Arg1>
static decltype(static_cast<_Tp1>(declval<_Arg1>()), __one())
__test(int);
template<typename, typename>
static __two __test(...);
public:
static const bool __value = sizeof(__test<_Tp, _Arg>(0)) == 1;
};
/// is_constructible
// XXX FIXME
// The C++0x specifications require front-end support, see N2255.
template<typename _Tp, typename... _Args>
struct is_constructible
: public integral_constant<bool,
__is_constructible_helper<_Tp,
_Args...>::__value>
{ };
template<bool, typename _Tp, typename... _Args>
struct __is_nt_constructible_helper
{ static const bool __value = false; };
template<typename _Tp, typename... _Args>
struct __is_nt_constructible_helper<true, _Tp, _Args...>
{ static const bool __value = noexcept(_Tp(declval<_Args>()...)); };
template<typename _Tp, typename _Arg>
struct __is_nt_constructible_helper<true, _Tp, _Arg>
{
static const bool __value = noexcept(static_cast<_Tp>(declval<_Arg>()));
};
/// is_nothrow_constructible
template<typename _Tp, typename... _Args>
struct is_nothrow_constructible
: public integral_constant<bool,
__is_nt_constructible_helper<is_constructible<_Tp, _Args...>::value,
_Tp, _Args...>::__value>
{ };
/// has_trivial_default_constructor
template<typename _Tp>
struct has_trivial_default_constructor
: public integral_constant<bool, __has_trivial_constructor(_Tp)>
{ };
/// has_trivial_copy_constructor
template<typename _Tp>
struct has_trivial_copy_constructor
: public integral_constant<bool, __has_trivial_copy(_Tp)>
{ };
/// has_trivial_copy_assign
template<typename _Tp>
struct has_trivial_copy_assign
: public integral_constant<bool, __has_trivial_assign(_Tp)>
{ };
/// has_trivial_destructor
template<typename _Tp>
struct has_trivial_destructor
: public integral_constant<bool, __has_trivial_destructor(_Tp)>
{ };
/// has_nothrow_default_constructor
template<typename _Tp>
struct has_nothrow_default_constructor
: public integral_constant<bool, __has_nothrow_constructor(_Tp)>
{ };
/// has_nothrow_copy_constructor
template<typename _Tp>
struct has_nothrow_copy_constructor
: public integral_constant<bool, __has_nothrow_copy(_Tp)>
{ };
/// has_nothrow_copy_assign
template<typename _Tp>
struct has_nothrow_copy_assign
: public integral_constant<bool, __has_nothrow_assign(_Tp)>
{ };
// Relationships between types.
/// is_base_of
template<typename _Base, typename _Derived>
struct is_base_of
: public integral_constant<bool, __is_base_of(_Base, _Derived)>
{ };
template<typename _From, typename _To,
bool = (is_void<_From>::value || is_function<_To>::value
|| is_array<_To>::value)>
struct __is_convertible_helper
{ static const bool __value = is_void<_To>::value; };
template<typename _From, typename _To>
class __is_convertible_helper<_From, _To, false>
: public __sfinae_types
{
template<typename _To1>
static void __test_aux(_To1);
template<typename _From1, typename _To1>
static decltype(__test_aux<_To1>(std::declval<_From1>()), __one())
__test(int);
template<typename, typename>
static __two __test(...);
public:
static const bool __value = sizeof(__test<_From, _To>(0)) == 1;
};
/// is_convertible
// XXX FIXME
// The C++0x specifications require front-end support, see N2255.
template<typename _From, typename _To>
struct is_convertible
: public integral_constant<bool,
__is_convertible_helper<_From, _To>::__value>
{ };
/// is_explicitly_convertible
template<typename _From, typename _To>
struct is_explicitly_convertible
: public is_constructible<_To, _From>
{ };
template<std::size_t _Len>
struct __aligned_storage_msa
{
union __type
{
unsigned char __data[_Len];
struct __attribute__((__aligned__)) { } __align;
};
};
/**
* @brief Alignment type.
*
* The value of _Align is a default-alignment which shall be the
* most stringent alignment requirement for any C++ object type
* whose size is no greater than _Len (3.9). The member typedef
* type shall be a POD type suitable for use as uninitialized
* storage for any object whose size is at most _Len and whose
* alignment is a divisor of _Align.
*/
template<std::size_t _Len, std::size_t _Align =
__alignof__(typename __aligned_storage_msa<_Len>::__type)>
struct aligned_storage
{
union type
{
unsigned char __data[_Len];
struct __attribute__((__aligned__((_Align)))) { } __align;
};
};
// Define a nested type if some predicate holds.
// Primary template.
/// enable_if
template<bool, typename _Tp = void>
struct enable_if
{ };
// Partial specialization for true.
template<typename _Tp>
struct enable_if<true, _Tp>
{ typedef _Tp type; };
// A conditional expression, but for types. If true, first, if false, second.
// Primary template.
/// conditional
template<bool _Cond, typename _Iftrue, typename _Iffalse>
struct conditional
{ typedef _Iftrue type; };
// Partial specialization for false.
template<typename _Iftrue, typename _Iffalse>
struct conditional<false, _Iftrue, _Iffalse>
{ typedef _Iffalse type; };
// Decay trait for arrays and functions, used for perfect forwarding
// in make_pair, make_tuple, etc.
template<typename _Up,
bool _IsArray = is_array<_Up>::value,
bool _IsFunction = is_function<_Up>::value>
struct __decay_selector;
// NB: DR 705.
template<typename _Up>
struct __decay_selector<_Up, false, false>
{ typedef typename remove_cv<_Up>::type __type; };
template<typename _Up>
struct __decay_selector<_Up, true, false>
{ typedef typename remove_extent<_Up>::type* __type; };
template<typename _Up>
struct __decay_selector<_Up, false, true>
{ typedef typename add_pointer<_Up>::type __type; };
/// decay
template<typename _Tp>
class decay
{
typedef typename remove_reference<_Tp>::type __remove_type;
public:
typedef typename __decay_selector<__remove_type>::__type type;
};
template<typename _Tp>
class reference_wrapper;
// Helper which adds a reference to a type when given a reference_wrapper
template<typename _Tp>
struct __strip_reference_wrapper
{
typedef _Tp __type;
};
template<typename _Tp>
struct __strip_reference_wrapper<reference_wrapper<_Tp> >
{
typedef _Tp& __type;
};
template<typename _Tp>
struct __strip_reference_wrapper<const reference_wrapper<_Tp> >
{
typedef _Tp& __type;
};
template<typename _Tp>
struct __decay_and_strip
{
typedef typename __strip_reference_wrapper<
typename decay<_Tp>::type>::__type __type;
};
// Utility for constructing identically cv-qualified types.
template<typename _Unqualified, bool _IsConst, bool _IsVol>
struct __cv_selector;
template<typename _Unqualified>
struct __cv_selector<_Unqualified, false, false>
{ typedef _Unqualified __type; };
template<typename _Unqualified>
struct __cv_selector<_Unqualified, false, true>
{ typedef volatile _Unqualified __type; };
template<typename _Unqualified>
struct __cv_selector<_Unqualified, true, false>
{ typedef const _Unqualified __type; };
template<typename _Unqualified>
struct __cv_selector<_Unqualified, true, true>
{ typedef const volatile _Unqualified __type; };
template<typename _Qualified, typename _Unqualified,
bool _IsConst = is_const<_Qualified>::value,
bool _IsVol = is_volatile<_Qualified>::value>
class __match_cv_qualifiers
{
typedef __cv_selector<_Unqualified, _IsConst, _IsVol> __match;
public:
typedef typename __match::__type __type;
};
// Utility for finding the unsigned versions of signed integral types.
template<typename _Tp>
struct __make_unsigned
{ typedef _Tp __type; };
template<>
struct __make_unsigned<char>
{ typedef unsigned char __type; };
template<>
struct __make_unsigned<signed char>
{ typedef unsigned char __type; };
template<>
struct __make_unsigned<short>
{ typedef unsigned short __type; };
template<>
struct __make_unsigned<int>
{ typedef unsigned int __type; };
template<>
struct __make_unsigned<long>
{ typedef unsigned long __type; };
template<>
struct __make_unsigned<long long>
{ typedef unsigned long long __type; };
// Select between integral and enum: not possible to be both.
template<typename _Tp,
bool _IsInt = is_integral<_Tp>::value,
bool _IsEnum = is_enum<_Tp>::value>
class __make_unsigned_selector;
template<typename _Tp>
class __make_unsigned_selector<_Tp, true, false>
{
typedef __make_unsigned<typename remove_cv<_Tp>::type> __unsignedt;
typedef typename __unsignedt::__type __unsigned_type;
typedef __match_cv_qualifiers<_Tp, __unsigned_type> __cv_unsigned;
public:
typedef typename __cv_unsigned::__type __type;
};
template<typename _Tp>
class __make_unsigned_selector<_Tp, false, true>
{
// With -fshort-enums, an enum may be as small as a char.
typedef unsigned char __smallest;
static const bool __b0 = sizeof(_Tp) <= sizeof(__smallest);
static const bool __b1 = sizeof(_Tp) <= sizeof(unsigned short);
static const bool __b2 = sizeof(_Tp) <= sizeof(unsigned int);
typedef conditional<__b2, unsigned int, unsigned long> __cond2;
typedef typename __cond2::type __cond2_type;
typedef conditional<__b1, unsigned short, __cond2_type> __cond1;
typedef typename __cond1::type __cond1_type;
public:
typedef typename conditional<__b0, __smallest, __cond1_type>::type __type;
};
// Given an integral/enum type, return the corresponding unsigned
// integer type.
// Primary template.
/// make_unsigned
template<typename _Tp>
struct make_unsigned
{ typedef typename __make_unsigned_selector<_Tp>::__type type; };
// Integral, but don't define.
template<>
struct make_unsigned<bool>;
// Utility for finding the signed versions of unsigned integral types.
template<typename _Tp>
struct __make_signed
{ typedef _Tp __type; };
template<>
struct __make_signed<char>
{ typedef signed char __type; };
template<>
struct __make_signed<unsigned char>
{ typedef signed char __type; };
template<>
struct __make_signed<unsigned short>
{ typedef signed short __type; };
template<>
struct __make_signed<unsigned int>
{ typedef signed int __type; };
template<>
struct __make_signed<unsigned long>
{ typedef signed long __type; };
template<>
struct __make_signed<unsigned long long>
{ typedef signed long long __type; };
// Select between integral and enum: not possible to be both.
template<typename _Tp,
bool _IsInt = is_integral<_Tp>::value,
bool _IsEnum = is_enum<_Tp>::value>
class __make_signed_selector;
template<typename _Tp>
class __make_signed_selector<_Tp, true, false>
{
typedef __make_signed<typename remove_cv<_Tp>::type> __signedt;
typedef typename __signedt::__type __signed_type;
typedef __match_cv_qualifiers<_Tp, __signed_type> __cv_signed;
public:
typedef typename __cv_signed::__type __type;
};
template<typename _Tp>
class __make_signed_selector<_Tp, false, true>
{
// With -fshort-enums, an enum may be as small as a char.
typedef signed char __smallest;
static const bool __b0 = sizeof(_Tp) <= sizeof(__smallest);
static const bool __b1 = sizeof(_Tp) <= sizeof(signed short);
static const bool __b2 = sizeof(_Tp) <= sizeof(signed int);
typedef conditional<__b2, signed int, signed long> __cond2;
typedef typename __cond2::type __cond2_type;
typedef conditional<__b1, signed short, __cond2_type> __cond1;
typedef typename __cond1::type __cond1_type;
public:
typedef typename conditional<__b0, __smallest, __cond1_type>::type __type;
};
// Given an integral/enum type, return the corresponding signed
// integer type.
// Primary template.
/// make_signed
template<typename _Tp>
struct make_signed
{ typedef typename __make_signed_selector<_Tp>::__type type; };
// Integral, but don't define.
template<>
struct make_signed<bool>;
/// common_type
template<typename... _Tp>
struct common_type;
template<typename _Tp>
struct common_type<_Tp>
{ typedef _Tp type; };
template<typename _Tp, typename _Up>
struct common_type<_Tp, _Up>
{ typedef decltype(true ? declval<_Tp>() : declval<_Up>()) type; };
template<typename _Tp, typename _Up, typename... _Vp>
struct common_type<_Tp, _Up, _Vp...>
{
typedef typename
common_type<typename common_type<_Tp, _Up>::type, _Vp...>::type type;
};
/// declval
template<typename _Tp>
struct __declval_protector
{
static const bool __stop = false;
static typename add_rvalue_reference<_Tp>::type __delegate();
};
template<typename _Tp>
inline typename add_rvalue_reference<_Tp>::type
declval() noexcept
{
static_assert(__declval_protector<_Tp>::__stop,
"declval() must not be used!");
return __declval_protector<_Tp>::__delegate();
}
/// result_of
template<typename _Signature>
class result_of;
template<typename _MemPtr, typename _Arg>
struct _Result_of_memobj;
template<typename _Res, typename _Class, typename _Arg>
struct _Result_of_memobj<_Res _Class::*, _Arg>
{
private:
typedef _Res _Class::* _Func;
template<typename _Tp>
static _Tp _S_get(const _Class&);
template<typename _Tp>
static decltype(*std::declval<_Tp>()) _S_get(...);
public:
typedef
decltype(_S_get<_Arg>(std::declval<_Arg>()).*std::declval<_Func>())
__type;
};
template<typename _MemPtr, typename _Arg, typename... _ArgTypes>
struct _Result_of_memfun;
template<typename _Res, typename _Class, typename _Arg, typename... _Args>
struct _Result_of_memfun<_Res _Class::*, _Arg, _Args...>
{
private:
typedef _Res _Class::* _Func;
template<typename _Tp>
static _Tp _S_get(const _Class&);
template<typename _Tp>
static decltype(*std::declval<_Tp>()) _S_get(...);
public:
typedef
decltype((_S_get<_Arg>(std::declval<_Arg>()).*std::declval<_Func>())
(std::declval<_Args>()...) )
__type;
};
template<bool, bool, typename _Functor, typename... _ArgTypes>
struct _Result_of_impl;
template<typename _Functor, typename... _ArgTypes>
struct _Result_of_impl<false, false, _Functor, _ArgTypes...>
{
typedef
decltype( std::declval<_Functor>()(std::declval<_ArgTypes>()...) )
__type;
};
template<typename _MemPtr, typename _Arg>
struct _Result_of_impl<true, false, _MemPtr, _Arg>
: _Result_of_memobj<typename remove_reference<_MemPtr>::type, _Arg>
{
typedef typename _Result_of_memobj<
typename remove_reference<_MemPtr>::type, _Arg>::__type
__type;
};
template<typename _MemPtr, typename _Arg, typename... _ArgTypes>
struct _Result_of_impl<false, true, _MemPtr, _Arg, _ArgTypes...>
: _Result_of_memfun<typename remove_reference<_MemPtr>::type, _Arg,
_ArgTypes...>
{
typedef typename _Result_of_memfun<
typename remove_reference<_MemPtr>::type, _Arg, _ArgTypes...>::__type
__type;
};
template<typename _Functor, typename... _ArgTypes>
struct result_of<_Functor(_ArgTypes...)>
: _Result_of_impl<is_member_object_pointer<
typename remove_reference<_Functor>::type >::value,
is_member_function_pointer<
typename remove_reference<_Functor>::type >::value,
_Functor, _ArgTypes...>
{
typedef typename _Result_of_impl<
is_member_object_pointer<
typename remove_reference<_Functor>::type >::value,
is_member_function_pointer<
typename remove_reference<_Functor>::type >::value,
_Functor, _ArgTypes...>::__type
type;
};
/**
* Use SFINAE to determine if the type _Tp has a publicly-accessible
* member type _NTYPE.
*/
#define _GLIBCXX_HAS_NESTED_TYPE(_NTYPE) \
template<typename _Tp> \
class __has_##_NTYPE##_helper \
: __sfinae_types \
{ \
template<typename _Up> \
struct _Wrap_type \
{ }; \
\
template<typename _Up> \
static __one __test(_Wrap_type<typename _Up::_NTYPE>*); \
\
template<typename _Up> \
static __two __test(...); \
\
public: \
static const bool value = sizeof(__test<_Tp>(0)) == 1; \
}; \
\
template<typename _Tp> \
struct __has_##_NTYPE \
: integral_constant<bool, __has_##_NTYPE##_helper \
<typename remove_cv<_Tp>::type>::value> \
{ };
#undef _DEFINE_SPEC_0_HELPER
#undef _DEFINE_SPEC_1_HELPER
#undef _DEFINE_SPEC_2_HELPER
#undef _DEFINE_SPEC
// @} group metaprogramming
_GLIBCXX_END_NAMESPACE_VERSION
} // namespace
#endif // __GXX_EXPERIMENTAL_CXX0X__
#endif // _GLIBCXX_TYPE_TRAITS