0,0 → 1,2074 |
// C++11 <type_traits> -*- C++ -*- |
|
// Copyright (C) 2007-2013 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 |
|
#if __cplusplus < 201103L |
# include <bits/c++0x_warning.h> |
#else |
|
#include <bits/c++config.h> |
|
namespace std _GLIBCXX_VISIBILITY(default) |
{ |
_GLIBCXX_BEGIN_NAMESPACE_VERSION |
|
/** |
* @defgroup metaprogramming Metaprogramming |
* @ingroup utilities |
* |
* Template utilities for compile-time introspection and modification, |
* including type classification traits, type property inspection traits |
* and type transformation traits. |
* |
* @{ |
*/ |
|
/// 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; } |
}; |
|
template<typename _Tp, _Tp __v> |
constexpr _Tp integral_constant<_Tp, __v>::value; |
|
/// The type used as a compile-time boolean with true value. |
typedef integral_constant<bool, true> true_type; |
|
/// The type used as a compile-time boolean with false value. |
typedef integral_constant<bool, false> false_type; |
|
// Meta programming helper types. |
|
template<bool, typename, typename> |
struct conditional; |
|
template<typename...> |
struct __or_; |
|
template<> |
struct __or_<> |
: public false_type |
{ }; |
|
template<typename _B1> |
struct __or_<_B1> |
: public _B1 |
{ }; |
|
template<typename _B1, typename _B2> |
struct __or_<_B1, _B2> |
: public conditional<_B1::value, _B1, _B2>::type |
{ }; |
|
template<typename _B1, typename _B2, typename _B3, typename... _Bn> |
struct __or_<_B1, _B2, _B3, _Bn...> |
: public conditional<_B1::value, _B1, __or_<_B2, _B3, _Bn...>>::type |
{ }; |
|
template<typename...> |
struct __and_; |
|
template<> |
struct __and_<> |
: public true_type |
{ }; |
|
template<typename _B1> |
struct __and_<_B1> |
: public _B1 |
{ }; |
|
template<typename _B1, typename _B2> |
struct __and_<_B1, _B2> |
: public conditional<_B1::value, _B2, _B1>::type |
{ }; |
|
template<typename _B1, typename _B2, typename _B3, typename... _Bn> |
struct __and_<_B1, _B2, _B3, _Bn...> |
: public conditional<_B1::value, __and_<_B2, _B3, _Bn...>, _B1>::type |
{ }; |
|
template<typename _Pp> |
struct __not_ |
: public integral_constant<bool, !_Pp::value> |
{ }; |
|
struct __sfinae_types |
{ |
typedef char __one; |
typedef struct { char __arr[2]; } __two; |
}; |
|
// For several sfinae-friendly trait implementations we transport both the |
// result information (as the member type) and the failure information (no |
// member type). This is very similar to std::enable_if, but we cannot use |
// them, because we need to derive from them as an implementation detail. |
|
template<typename _Tp> |
struct __success_type |
{ typedef _Tp type; }; |
|
struct __failure_type |
{ }; |
|
// Primary type categories. |
|
template<typename> |
struct remove_cv; |
|
template<typename> |
struct __is_void_helper |
: public false_type { }; |
|
template<> |
struct __is_void_helper<void> |
: public true_type { }; |
|
/// 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 { }; |
|
template<> |
struct __is_integral_helper<bool> |
: public true_type { }; |
|
template<> |
struct __is_integral_helper<char> |
: public true_type { }; |
|
template<> |
struct __is_integral_helper<signed char> |
: public true_type { }; |
|
template<> |
struct __is_integral_helper<unsigned char> |
: public true_type { }; |
|
#ifdef _GLIBCXX_USE_WCHAR_T |
template<> |
struct __is_integral_helper<wchar_t> |
: public true_type { }; |
#endif |
|
template<> |
struct __is_integral_helper<char16_t> |
: public true_type { }; |
|
template<> |
struct __is_integral_helper<char32_t> |
: public true_type { }; |
|
template<> |
struct __is_integral_helper<short> |
: public true_type { }; |
|
template<> |
struct __is_integral_helper<unsigned short> |
: public true_type { }; |
|
template<> |
struct __is_integral_helper<int> |
: public true_type { }; |
|
template<> |
struct __is_integral_helper<unsigned int> |
: public true_type { }; |
|
template<> |
struct __is_integral_helper<long> |
: public true_type { }; |
|
template<> |
struct __is_integral_helper<unsigned long> |
: public true_type { }; |
|
template<> |
struct __is_integral_helper<long long> |
: public true_type { }; |
|
template<> |
struct __is_integral_helper<unsigned long long> |
: public true_type { }; |
|
#if !defined(__STRICT_ANSI__) && defined(_GLIBCXX_USE_INT128) |
template<> |
struct __is_integral_helper<__int128> |
: public true_type { }; |
|
template<> |
struct __is_integral_helper<unsigned __int128> |
: public true_type { }; |
#endif |
|
/// 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 { }; |
|
template<> |
struct __is_floating_point_helper<float> |
: public true_type { }; |
|
template<> |
struct __is_floating_point_helper<double> |
: public true_type { }; |
|
template<> |
struct __is_floating_point_helper<long double> |
: public true_type { }; |
|
#if !defined(__STRICT_ANSI__) && defined(_GLIBCXX_USE_FLOAT128) |
template<> |
struct __is_floating_point_helper<__float128> |
: public true_type { }; |
#endif |
|
/// 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 { }; |
|
template<typename _Tp> |
struct __is_pointer_helper<_Tp*> |
: public true_type { }; |
|
/// is_pointer |
template<typename _Tp> |
struct is_pointer |
: public integral_constant<bool, (__is_pointer_helper<typename |
remove_cv<_Tp>::type>::value)> |
{ }; |
|
/// 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 { }; |
|
template<typename> |
struct is_function; |
|
template<typename> |
struct __is_member_object_pointer_helper |
: public false_type { }; |
|
template<typename _Tp, typename _Cp> |
struct __is_member_object_pointer_helper<_Tp _Cp::*> |
: public integral_constant<bool, !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 { }; |
|
template<typename _Tp, typename _Cp> |
struct __is_member_function_pointer_helper<_Tp _Cp::*> |
: public integral_constant<bool, 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 { }; |
|
template<> |
struct __is_nullptr_t_helper<std::nullptr_t> |
: public true_type { }; |
|
// __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 categories. |
|
/// is_reference |
template<typename _Tp> |
struct is_reference |
: public __or_<is_lvalue_reference<_Tp>, |
is_rvalue_reference<_Tp>>::type |
{ }; |
|
/// is_arithmetic |
template<typename _Tp> |
struct is_arithmetic |
: public __or_<is_integral<_Tp>, is_floating_point<_Tp>>::type |
{ }; |
|
/// is_fundamental |
template<typename _Tp> |
struct is_fundamental |
: public __or_<is_arithmetic<_Tp>, is_void<_Tp>, __is_nullptr_t<_Tp>>::type |
{ }; |
|
/// is_object |
template<typename _Tp> |
struct is_object |
: public __not_<__or_<is_function<_Tp>, is_reference<_Tp>, |
is_void<_Tp>>>::type |
{ }; |
|
template<typename> |
struct is_member_pointer; |
|
/// is_scalar |
template<typename _Tp> |
struct is_scalar |
: public __or_<is_arithmetic<_Tp>, is_enum<_Tp>, is_pointer<_Tp>, |
is_member_pointer<_Tp>, __is_nullptr_t<_Tp>>::type |
{ }; |
|
/// is_compound |
template<typename _Tp> |
struct is_compound |
: public integral_constant<bool, !is_fundamental<_Tp>::value> { }; |
|
template<typename _Tp> |
struct __is_member_pointer_helper |
: public false_type { }; |
|
template<typename _Tp, typename _Cp> |
struct __is_member_pointer_helper<_Tp _Cp::*> |
: public true_type { }; |
|
/// is_member_pointer |
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_trivial |
template<typename _Tp> |
struct is_trivial |
: public integral_constant<bool, __is_trivial(_Tp)> |
{ }; |
|
// is_trivially_copyable (still unimplemented) |
|
/// 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)> |
{ }; |
|
/// 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)> |
{ }; |
|
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 __and_<is_arithmetic<_Tp>, __not_<is_signed<_Tp>>>::type |
{ }; |
|
|
// Destructible and constructible type properties. |
|
template<typename> |
struct add_rvalue_reference; |
|
/** |
* @brief Utility to simplify expressions used in unevaluated operands |
* @ingroup utilities |
*/ |
template<typename _Tp> |
typename add_rvalue_reference<_Tp>::type declval() noexcept; |
|
template<typename, unsigned = 0> |
struct extent; |
|
template<typename> |
struct remove_all_extents; |
|
template<typename _Tp> |
struct __is_array_known_bounds |
: public integral_constant<bool, (extent<_Tp>::value > 0)> |
{ }; |
|
template<typename _Tp> |
struct __is_array_unknown_bounds |
: public __and_<is_array<_Tp>, __not_<extent<_Tp>>>::type |
{ }; |
|
// In N3290 is_destructible does not say anything about function |
// types and abstract types, see LWG 2049. This implementation |
// describes function types as non-destructible and all complete |
// object types as destructible, iff the explicit destructor |
// call expression is wellformed. |
struct __do_is_destructible_impl |
{ |
template<typename _Tp, typename = decltype(declval<_Tp&>().~_Tp())> |
static true_type __test(int); |
|
template<typename> |
static false_type __test(...); |
}; |
|
template<typename _Tp> |
struct __is_destructible_impl |
: public __do_is_destructible_impl |
{ |
typedef decltype(__test<_Tp>(0)) type; |
}; |
|
template<typename _Tp, |
bool = __or_<is_void<_Tp>, |
__is_array_unknown_bounds<_Tp>, |
is_function<_Tp>>::value, |
bool = __or_<is_reference<_Tp>, is_scalar<_Tp>>::value> |
struct __is_destructible_safe; |
|
template<typename _Tp> |
struct __is_destructible_safe<_Tp, false, false> |
: public __is_destructible_impl<typename |
remove_all_extents<_Tp>::type>::type |
{ }; |
|
template<typename _Tp> |
struct __is_destructible_safe<_Tp, true, false> |
: public false_type { }; |
|
template<typename _Tp> |
struct __is_destructible_safe<_Tp, false, true> |
: public true_type { }; |
|
/// is_destructible |
template<typename _Tp> |
struct is_destructible |
: public integral_constant<bool, (__is_destructible_safe<_Tp>::value)> |
{ }; |
|
// is_nothrow_destructible requires that is_destructible is |
// satisfied as well. We realize that by mimicing the |
// implementation of is_destructible but refer to noexcept(expr) |
// instead of decltype(expr). |
struct __do_is_nt_destructible_impl |
{ |
template<typename _Tp> |
static integral_constant<bool, noexcept(declval<_Tp&>().~_Tp())> |
__test(int); |
|
template<typename> |
static false_type __test(...); |
}; |
|
template<typename _Tp> |
struct __is_nt_destructible_impl |
: public __do_is_nt_destructible_impl |
{ |
typedef decltype(__test<_Tp>(0)) type; |
}; |
|
template<typename _Tp, |
bool = __or_<is_void<_Tp>, |
__is_array_unknown_bounds<_Tp>, |
is_function<_Tp>>::value, |
bool = __or_<is_reference<_Tp>, is_scalar<_Tp>>::value> |
struct __is_nt_destructible_safe; |
|
template<typename _Tp> |
struct __is_nt_destructible_safe<_Tp, false, false> |
: public __is_nt_destructible_impl<typename |
remove_all_extents<_Tp>::type>::type |
{ }; |
|
template<typename _Tp> |
struct __is_nt_destructible_safe<_Tp, true, false> |
: public false_type { }; |
|
template<typename _Tp> |
struct __is_nt_destructible_safe<_Tp, false, true> |
: public true_type { }; |
|
/// is_nothrow_destructible |
template<typename _Tp> |
struct is_nothrow_destructible |
: public integral_constant<bool, (__is_nt_destructible_safe<_Tp>::value)> |
{ }; |
|
struct __do_is_default_constructible_impl |
{ |
template<typename _Tp, typename = decltype(_Tp())> |
static true_type __test(int); |
|
template<typename> |
static false_type __test(...); |
}; |
|
template<typename _Tp> |
struct __is_default_constructible_impl |
: public __do_is_default_constructible_impl |
{ |
typedef decltype(__test<_Tp>(0)) type; |
}; |
|
template<typename _Tp> |
struct __is_default_constructible_atom |
: public __and_<__not_<is_void<_Tp>>, |
__is_default_constructible_impl<_Tp>>::type |
{ }; |
|
template<typename _Tp, bool = is_array<_Tp>::value> |
struct __is_default_constructible_safe; |
|
// The following technique is a workaround for a current core language |
// restriction, which does not allow for array types to occur in |
// functional casts of the form T(). Complete arrays can be default- |
// constructed, if the element type is default-constructible, but |
// arrays with unknown bounds are not. |
template<typename _Tp> |
struct __is_default_constructible_safe<_Tp, true> |
: public __and_<__is_array_known_bounds<_Tp>, |
__is_default_constructible_atom<typename |
remove_all_extents<_Tp>::type>>::type |
{ }; |
|
template<typename _Tp> |
struct __is_default_constructible_safe<_Tp, false> |
: public __is_default_constructible_atom<_Tp>::type |
{ }; |
|
/// is_default_constructible |
template<typename _Tp> |
struct is_default_constructible |
: public integral_constant<bool, (__is_default_constructible_safe< |
_Tp>::value)> |
{ }; |
|
|
// Implementation of is_constructible. |
|
// The hardest part of this trait is the binary direct-initialization |
// case, because we hit into a functional cast of the form T(arg). |
// This implementation uses different strategies depending on the |
// target type to reduce the test overhead as much as possible: |
// |
// a) For a reference target type, we use a static_cast expression |
// modulo its extra cases. |
// |
// b) For a non-reference target type we use a ::new expression. |
struct __do_is_static_castable_impl |
{ |
template<typename _From, typename _To, typename |
= decltype(static_cast<_To>(declval<_From>()))> |
static true_type __test(int); |
|
template<typename, typename> |
static false_type __test(...); |
}; |
|
template<typename _From, typename _To> |
struct __is_static_castable_impl |
: public __do_is_static_castable_impl |
{ |
typedef decltype(__test<_From, _To>(0)) type; |
}; |
|
template<typename _From, typename _To> |
struct __is_static_castable_safe |
: public __is_static_castable_impl<_From, _To>::type |
{ }; |
|
// __is_static_castable |
template<typename _From, typename _To> |
struct __is_static_castable |
: public integral_constant<bool, (__is_static_castable_safe< |
_From, _To>::value)> |
{ }; |
|
// Implementation for non-reference types. To meet the proper |
// variable definition semantics, we also need to test for |
// is_destructible in this case. |
// This form should be simplified by a single expression: |
// ::delete ::new _Tp(declval<_Arg>()), see c++/51222. |
struct __do_is_direct_constructible_impl |
{ |
template<typename _Tp, typename _Arg, typename |
= decltype(::new _Tp(declval<_Arg>()))> |
static true_type __test(int); |
|
template<typename, typename> |
static false_type __test(...); |
}; |
|
template<typename _Tp, typename _Arg> |
struct __is_direct_constructible_impl |
: public __do_is_direct_constructible_impl |
{ |
typedef decltype(__test<_Tp, _Arg>(0)) type; |
}; |
|
template<typename _Tp, typename _Arg> |
struct __is_direct_constructible_new_safe |
: public __and_<is_destructible<_Tp>, |
__is_direct_constructible_impl<_Tp, _Arg>>::type |
{ }; |
|
template<typename, typename> |
struct is_same; |
|
template<typename, typename> |
struct is_base_of; |
|
template<typename> |
struct remove_reference; |
|
template<typename _From, typename _To, bool |
= __not_<__or_<is_void<_From>, |
is_function<_From>>>::value> |
struct __is_base_to_derived_ref; |
|
// Detect whether we have a downcast situation during |
// reference binding. |
template<typename _From, typename _To> |
struct __is_base_to_derived_ref<_From, _To, true> |
{ |
typedef typename remove_cv<typename remove_reference<_From |
>::type>::type __src_t; |
typedef typename remove_cv<typename remove_reference<_To |
>::type>::type __dst_t; |
typedef __and_<__not_<is_same<__src_t, __dst_t>>, |
is_base_of<__src_t, __dst_t>> type; |
static constexpr bool value = type::value; |
}; |
|
template<typename _From, typename _To> |
struct __is_base_to_derived_ref<_From, _To, false> |
: public false_type |
{ }; |
|
template<typename _From, typename _To, bool |
= __and_<is_lvalue_reference<_From>, |
is_rvalue_reference<_To>>::value> |
struct __is_lvalue_to_rvalue_ref; |
|
// Detect whether we have an lvalue of non-function type |
// bound to a reference-compatible rvalue-reference. |
template<typename _From, typename _To> |
struct __is_lvalue_to_rvalue_ref<_From, _To, true> |
{ |
typedef typename remove_cv<typename remove_reference< |
_From>::type>::type __src_t; |
typedef typename remove_cv<typename remove_reference< |
_To>::type>::type __dst_t; |
typedef __and_<__not_<is_function<__src_t>>, |
__or_<is_same<__src_t, __dst_t>, |
is_base_of<__dst_t, __src_t>>> type; |
static constexpr bool value = type::value; |
}; |
|
template<typename _From, typename _To> |
struct __is_lvalue_to_rvalue_ref<_From, _To, false> |
: public false_type |
{ }; |
|
// Here we handle direct-initialization to a reference type as |
// equivalent to a static_cast modulo overshooting conversions. |
// These are restricted to the following conversions: |
// a) A base class value to a derived class reference |
// b) An lvalue to an rvalue-reference of reference-compatible |
// types that are not functions |
template<typename _Tp, typename _Arg> |
struct __is_direct_constructible_ref_cast |
: public __and_<__is_static_castable<_Arg, _Tp>, |
__not_<__or_<__is_base_to_derived_ref<_Arg, _Tp>, |
__is_lvalue_to_rvalue_ref<_Arg, _Tp> |
>>>::type |
{ }; |
|
template<typename _Tp, typename _Arg> |
struct __is_direct_constructible_new |
: public conditional<is_reference<_Tp>::value, |
__is_direct_constructible_ref_cast<_Tp, _Arg>, |
__is_direct_constructible_new_safe<_Tp, _Arg> |
>::type |
{ }; |
|
template<typename _Tp, typename _Arg> |
struct __is_direct_constructible |
: public integral_constant<bool, (__is_direct_constructible_new< |
_Tp, _Arg>::value)> |
{ }; |
|
// Since default-construction and binary direct-initialization have |
// been handled separately, the implementation of the remaining |
// n-ary construction cases is rather straightforward. We can use |
// here a functional cast, because array types are excluded anyway |
// and this form is never interpreted as a C cast. |
struct __do_is_nary_constructible_impl |
{ |
template<typename _Tp, typename... _Args, typename |
= decltype(_Tp(declval<_Args>()...))> |
static true_type __test(int); |
|
template<typename, typename...> |
static false_type __test(...); |
}; |
|
template<typename _Tp, typename... _Args> |
struct __is_nary_constructible_impl |
: public __do_is_nary_constructible_impl |
{ |
typedef decltype(__test<_Tp, _Args...>(0)) type; |
}; |
|
template<typename _Tp, typename... _Args> |
struct __is_nary_constructible |
: public __is_nary_constructible_impl<_Tp, _Args...>::type |
{ |
static_assert(sizeof...(_Args) > 1, |
"Only useful for > 1 arguments"); |
}; |
|
template<typename _Tp, typename... _Args> |
struct __is_constructible_impl |
: public __is_nary_constructible<_Tp, _Args...> |
{ }; |
|
template<typename _Tp, typename _Arg> |
struct __is_constructible_impl<_Tp, _Arg> |
: public __is_direct_constructible<_Tp, _Arg> |
{ }; |
|
template<typename _Tp> |
struct __is_constructible_impl<_Tp> |
: public is_default_constructible<_Tp> |
{ }; |
|
/// is_constructible |
template<typename _Tp, typename... _Args> |
struct is_constructible |
: public integral_constant<bool, (__is_constructible_impl<_Tp, |
_Args...>::value)> |
{ }; |
|
template<typename _Tp, bool = is_void<_Tp>::value> |
struct __is_copy_constructible_impl; |
|
template<typename _Tp> |
struct __is_copy_constructible_impl<_Tp, true> |
: public false_type { }; |
|
template<typename _Tp> |
struct __is_copy_constructible_impl<_Tp, false> |
: public is_constructible<_Tp, const _Tp&> |
{ }; |
|
/// is_copy_constructible |
template<typename _Tp> |
struct is_copy_constructible |
: public __is_copy_constructible_impl<_Tp> |
{ }; |
|
template<typename _Tp, bool = is_void<_Tp>::value> |
struct __is_move_constructible_impl; |
|
template<typename _Tp> |
struct __is_move_constructible_impl<_Tp, true> |
: public false_type { }; |
|
template<typename _Tp> |
struct __is_move_constructible_impl<_Tp, false> |
: public is_constructible<_Tp, _Tp&&> |
{ }; |
|
/// is_move_constructible |
template<typename _Tp> |
struct is_move_constructible |
: public __is_move_constructible_impl<_Tp> |
{ }; |
|
template<typename _Tp> |
struct __is_nt_default_constructible_atom |
: public integral_constant<bool, noexcept(_Tp())> |
{ }; |
|
template<typename _Tp, bool = is_array<_Tp>::value> |
struct __is_nt_default_constructible_impl; |
|
template<typename _Tp> |
struct __is_nt_default_constructible_impl<_Tp, true> |
: public __and_<__is_array_known_bounds<_Tp>, |
__is_nt_default_constructible_atom<typename |
remove_all_extents<_Tp>::type>>::type |
{ }; |
|
template<typename _Tp> |
struct __is_nt_default_constructible_impl<_Tp, false> |
: public __is_nt_default_constructible_atom<_Tp> |
{ }; |
|
/// is_nothrow_default_constructible |
template<typename _Tp> |
struct is_nothrow_default_constructible |
: public __and_<is_default_constructible<_Tp>, |
__is_nt_default_constructible_impl<_Tp>>::type |
{ }; |
|
template<typename _Tp, typename... _Args> |
struct __is_nt_constructible_impl |
: public integral_constant<bool, noexcept(_Tp(declval<_Args>()...))> |
{ }; |
|
template<typename _Tp, typename _Arg> |
struct __is_nt_constructible_impl<_Tp, _Arg> |
: public integral_constant<bool, |
noexcept(static_cast<_Tp>(declval<_Arg>()))> |
{ }; |
|
template<typename _Tp> |
struct __is_nt_constructible_impl<_Tp> |
: public is_nothrow_default_constructible<_Tp> |
{ }; |
|
/// is_nothrow_constructible |
template<typename _Tp, typename... _Args> |
struct is_nothrow_constructible |
: public __and_<is_constructible<_Tp, _Args...>, |
__is_nt_constructible_impl<_Tp, _Args...>>::type |
{ }; |
|
template<typename _Tp, bool = is_void<_Tp>::value> |
struct __is_nothrow_copy_constructible_impl; |
|
template<typename _Tp> |
struct __is_nothrow_copy_constructible_impl<_Tp, true> |
: public false_type { }; |
|
template<typename _Tp> |
struct __is_nothrow_copy_constructible_impl<_Tp, false> |
: public is_nothrow_constructible<_Tp, const _Tp&> |
{ }; |
|
/// is_nothrow_copy_constructible |
template<typename _Tp> |
struct is_nothrow_copy_constructible |
: public __is_nothrow_copy_constructible_impl<_Tp> |
{ }; |
|
template<typename _Tp, bool = is_void<_Tp>::value> |
struct __is_nothrow_move_constructible_impl; |
|
template<typename _Tp> |
struct __is_nothrow_move_constructible_impl<_Tp, true> |
: public false_type { }; |
|
template<typename _Tp> |
struct __is_nothrow_move_constructible_impl<_Tp, false> |
: public is_nothrow_constructible<_Tp, _Tp&&> |
{ }; |
|
/// is_nothrow_move_constructible |
template<typename _Tp> |
struct is_nothrow_move_constructible |
: public __is_nothrow_move_constructible_impl<_Tp> |
{ }; |
|
template<typename _Tp, typename _Up> |
class __is_assignable_helper |
: public __sfinae_types |
{ |
template<typename _Tp1, typename _Up1> |
static decltype(declval<_Tp1>() = declval<_Up1>(), __one()) |
__test(int); |
|
template<typename, typename> |
static __two __test(...); |
|
public: |
static constexpr bool value = sizeof(__test<_Tp, _Up>(0)) == 1; |
}; |
|
/// is_assignable |
template<typename _Tp, typename _Up> |
struct is_assignable |
: public integral_constant<bool, |
__is_assignable_helper<_Tp, _Up>::value> |
{ }; |
|
template<typename _Tp, bool = is_void<_Tp>::value> |
struct __is_copy_assignable_impl; |
|
template<typename _Tp> |
struct __is_copy_assignable_impl<_Tp, true> |
: public false_type { }; |
|
template<typename _Tp> |
struct __is_copy_assignable_impl<_Tp, false> |
: public is_assignable<_Tp&, const _Tp&> |
{ }; |
|
/// is_copy_assignable |
template<typename _Tp> |
struct is_copy_assignable |
: public __is_copy_assignable_impl<_Tp> |
{ }; |
|
template<typename _Tp, bool = is_void<_Tp>::value> |
struct __is_move_assignable_impl; |
|
template<typename _Tp> |
struct __is_move_assignable_impl<_Tp, true> |
: public false_type { }; |
|
template<typename _Tp> |
struct __is_move_assignable_impl<_Tp, false> |
: public is_assignable<_Tp&, _Tp&&> |
{ }; |
|
/// is_move_assignable |
template<typename _Tp> |
struct is_move_assignable |
: public __is_move_assignable_impl<_Tp> |
{ }; |
|
template<typename _Tp, typename _Up> |
struct __is_nt_assignable_impl |
: public integral_constant<bool, noexcept(declval<_Tp>() = declval<_Up>())> |
{ }; |
|
/// is_nothrow_assignable |
template<typename _Tp, typename _Up> |
struct is_nothrow_assignable |
: public __and_<is_assignable<_Tp, _Up>, |
__is_nt_assignable_impl<_Tp, _Up>>::type |
{ }; |
|
template<typename _Tp, bool = is_void<_Tp>::value> |
struct __is_nt_copy_assignable_impl; |
|
template<typename _Tp> |
struct __is_nt_copy_assignable_impl<_Tp, true> |
: public false_type { }; |
|
template<typename _Tp> |
struct __is_nt_copy_assignable_impl<_Tp, false> |
: public is_nothrow_assignable<_Tp&, const _Tp&> |
{ }; |
|
/// is_nothrow_copy_assignable |
template<typename _Tp> |
struct is_nothrow_copy_assignable |
: public __is_nt_copy_assignable_impl<_Tp> |
{ }; |
|
template<typename _Tp, bool = is_void<_Tp>::value> |
struct __is_nt_move_assignable_impl; |
|
template<typename _Tp> |
struct __is_nt_move_assignable_impl<_Tp, true> |
: public false_type { }; |
|
template<typename _Tp> |
struct __is_nt_move_assignable_impl<_Tp, false> |
: public is_nothrow_assignable<_Tp&, _Tp&&> |
{ }; |
|
/// is_nothrow_move_assignable |
template<typename _Tp> |
struct is_nothrow_move_assignable |
: public __is_nt_move_assignable_impl<_Tp> |
{ }; |
|
/// is_trivially_constructible (still unimplemented) |
|
/// is_trivially_default_constructible (still unimplemented) |
|
/// is_trivially_copy_constructible (still unimplemented) |
|
/// is_trivially_move_constructible (still unimplemented) |
|
/// is_trivially_assignable (still unimplemented) |
|
/// is_trivially_copy_assignable (still unimplemented) |
|
/// is_trivially_move_assignable (still unimplemented) |
|
/// is_trivially_destructible |
template<typename _Tp> |
struct is_trivially_destructible |
: public __and_<is_destructible<_Tp>, integral_constant<bool, |
__has_trivial_destructor(_Tp)>>::type |
{ }; |
|
/// has_trivial_default_constructor (temporary legacy) |
template<typename _Tp> |
struct has_trivial_default_constructor |
: public integral_constant<bool, __has_trivial_constructor(_Tp)> |
{ }; |
|
/// has_trivial_copy_constructor (temporary legacy) |
template<typename _Tp> |
struct has_trivial_copy_constructor |
: public integral_constant<bool, __has_trivial_copy(_Tp)> |
{ }; |
|
/// has_trivial_copy_assign (temporary legacy) |
template<typename _Tp> |
struct has_trivial_copy_assign |
: public integral_constant<bool, __has_trivial_assign(_Tp)> |
{ }; |
|
/// has_virtual_destructor |
template<typename _Tp> |
struct has_virtual_destructor |
: public integral_constant<bool, __has_virtual_destructor(_Tp)> |
{ }; |
|
|
// type property queries. |
|
/// 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> |
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> |
{ }; |
|
|
// Type relations. |
|
/// is_same |
template<typename, typename> |
struct is_same |
: public false_type { }; |
|
template<typename _Tp> |
struct is_same<_Tp, _Tp> |
: public true_type { }; |
|
/// 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 = __or_<is_void<_From>, is_function<_To>, |
is_array<_To>>::value> |
struct __is_convertible_helper |
{ static constexpr 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 constexpr bool value = sizeof(__test<_From, _To>(0)) == 1; |
}; |
|
/// is_convertible |
template<typename _From, typename _To> |
struct is_convertible |
: public integral_constant<bool, |
__is_convertible_helper<_From, _To>::value> |
{ }; |
|
|
// Const-volatile modifications. |
|
/// 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; |
}; |
|
|
// 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 = __and_<__not_<is_reference<_Tp>>, |
__not_<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 = __and_<__not_<is_reference<_Tp>>, |
__not_<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> |
{ }; |
|
|
// Sign modifications. |
|
// 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; }; |
|
#if !defined(__STRICT_ANSI__) && defined(_GLIBCXX_USE_INT128) |
template<> |
struct __make_unsigned<__int128> |
{ typedef unsigned __int128 __type; }; |
#endif |
|
// 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; }; |
|
#if !defined(__STRICT_ANSI__) && defined(_GLIBCXX_USE_INT128) |
template<> |
struct __make_signed<unsigned __int128> |
{ typedef __int128 __type; }; |
#endif |
|
// 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>; |
|
|
// 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> |
{ }; |
|
/// add_pointer |
template<typename _Tp> |
struct add_pointer |
{ typedef typename remove_reference<_Tp>::type* type; }; |
|
|
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; |
}; |
}; |
|
|
// 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; |
}; |
|
|
// Primary template. |
/// Define a member typedef @c type only if a boolean constant is true. |
template<bool, typename _Tp = void> |
struct enable_if |
{ }; |
|
// Partial specialization for true. |
template<typename _Tp> |
struct enable_if<true, _Tp> |
{ typedef _Tp type; }; |
|
template<typename... _Cond> |
using _Require = typename enable_if<__and_<_Cond...>::value>::type; |
|
// Primary template. |
/// Define a member typedef @c type to one of two argument types. |
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; }; |
|
/// common_type |
template<typename... _Tp> |
struct common_type; |
|
// Sfinae-friendly common_type implementation: |
|
struct __do_common_type_impl |
{ |
template<typename _Tp, typename _Up> |
static __success_type<typename decay<decltype |
(true ? std::declval<_Tp>() |
: std::declval<_Up>())>::type> _S_test(int); |
|
template<typename, typename> |
static __failure_type _S_test(...); |
}; |
|
template<typename _Tp, typename _Up> |
struct __common_type_impl |
: private __do_common_type_impl |
{ |
typedef decltype(_S_test<_Tp, _Up>(0)) type; |
}; |
|
struct __do_member_type_wrapper |
{ |
template<typename _Tp> |
static __success_type<typename _Tp::type> _S_test(int); |
|
template<typename> |
static __failure_type _S_test(...); |
}; |
|
template<typename _Tp> |
struct __member_type_wrapper |
: private __do_member_type_wrapper |
{ |
typedef decltype(_S_test<_Tp>(0)) type; |
}; |
|
template<typename _CTp, typename... _Args> |
struct __expanded_common_type_wrapper |
{ |
typedef common_type<typename _CTp::type, _Args...> type; |
}; |
|
template<typename... _Args> |
struct __expanded_common_type_wrapper<__failure_type, _Args...> |
{ typedef __failure_type type; }; |
|
template<typename _Tp> |
struct common_type<_Tp> |
{ typedef typename decay<_Tp>::type type; }; |
|
template<typename _Tp, typename _Up> |
struct common_type<_Tp, _Up> |
: public __common_type_impl<_Tp, _Up>::type |
{ }; |
|
template<typename _Tp, typename _Up, typename... _Vp> |
struct common_type<_Tp, _Up, _Vp...> |
: public __expanded_common_type_wrapper<typename __member_type_wrapper< |
common_type<_Tp, _Up>>::type, _Vp...>::type |
{ }; |
|
/// The underlying type of an enum. |
template<typename _Tp> |
struct underlying_type |
{ |
typedef __underlying_type(_Tp) type; |
}; |
|
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; |
|
// Sfinae-friendly result_of implementation: |
|
// [func.require] paragraph 1 bullet 1: |
struct __result_of_memfun_ref_impl |
{ |
template<typename _Fp, typename _Tp1, typename... _Args> |
static __success_type<decltype( |
(std::declval<_Tp1>().*std::declval<_Fp>())(std::declval<_Args>()...) |
)> _S_test(int); |
|
template<typename...> |
static __failure_type _S_test(...); |
}; |
|
template<typename _MemPtr, typename _Arg, typename... _Args> |
struct __result_of_memfun_ref |
: private __result_of_memfun_ref_impl |
{ |
typedef decltype(_S_test<_MemPtr, _Arg, _Args...>(0)) type; |
}; |
|
// [func.require] paragraph 1 bullet 2: |
struct __result_of_memfun_deref_impl |
{ |
template<typename _Fp, typename _Tp1, typename... _Args> |
static __success_type<decltype( |
((*std::declval<_Tp1>()).*std::declval<_Fp>())(std::declval<_Args>()...) |
)> _S_test(int); |
|
template<typename...> |
static __failure_type _S_test(...); |
}; |
|
template<typename _MemPtr, typename _Arg, typename... _Args> |
struct __result_of_memfun_deref |
: private __result_of_memfun_deref_impl |
{ |
typedef decltype(_S_test<_MemPtr, _Arg, _Args...>(0)) type; |
}; |
|
// [func.require] paragraph 1 bullet 3: |
struct __result_of_memobj_ref_impl |
{ |
template<typename _Fp, typename _Tp1> |
static __success_type<decltype( |
std::declval<_Tp1>().*std::declval<_Fp>() |
)> _S_test(int); |
|
template<typename, typename> |
static __failure_type _S_test(...); |
}; |
|
template<typename _MemPtr, typename _Arg> |
struct __result_of_memobj_ref |
: private __result_of_memobj_ref_impl |
{ |
typedef decltype(_S_test<_MemPtr, _Arg>(0)) type; |
}; |
|
// [func.require] paragraph 1 bullet 4: |
struct __result_of_memobj_deref_impl |
{ |
template<typename _Fp, typename _Tp1> |
static __success_type<decltype( |
(*std::declval<_Tp1>()).*std::declval<_Fp>() |
)> _S_test(int); |
|
template<typename, typename> |
static __failure_type _S_test(...); |
}; |
|
template<typename _MemPtr, typename _Arg> |
struct __result_of_memobj_deref |
: private __result_of_memobj_deref_impl |
{ |
typedef decltype(_S_test<_MemPtr, _Arg>(0)) type; |
}; |
|
template<typename _MemPtr, typename _Arg> |
struct __result_of_memobj; |
|
template<typename _Res, typename _Class, typename _Arg> |
struct __result_of_memobj<_Res _Class::*, _Arg> |
{ |
typedef typename remove_cv<typename remove_reference< |
_Arg>::type>::type _Argval; |
typedef _Res _Class::* _MemPtr; |
typedef typename conditional<__or_<is_same<_Argval, _Class>, |
is_base_of<_Class, _Argval>>::value, |
__result_of_memobj_ref<_MemPtr, _Arg>, |
__result_of_memobj_deref<_MemPtr, _Arg> |
>::type::type type; |
}; |
|
template<typename _MemPtr, typename _Arg, typename... _Args> |
struct __result_of_memfun; |
|
template<typename _Res, typename _Class, typename _Arg, typename... _Args> |
struct __result_of_memfun<_Res _Class::*, _Arg, _Args...> |
{ |
typedef typename remove_cv<typename remove_reference< |
_Arg>::type>::type _Argval; |
typedef _Res _Class::* _MemPtr; |
typedef typename conditional<__or_<is_same<_Argval, _Class>, |
is_base_of<_Class, _Argval>>::value, |
__result_of_memfun_ref<_MemPtr, _Arg, _Args...>, |
__result_of_memfun_deref<_MemPtr, _Arg, _Args...> |
>::type::type type; |
}; |
|
template<bool, bool, typename _Functor, typename... _ArgTypes> |
struct __result_of_impl |
{ |
typedef __failure_type type; |
}; |
|
template<typename _MemPtr, typename _Arg> |
struct __result_of_impl<true, false, _MemPtr, _Arg> |
: public __result_of_memobj<typename decay<_MemPtr>::type, _Arg> |
{ }; |
|
template<typename _MemPtr, typename _Arg, typename... _Args> |
struct __result_of_impl<false, true, _MemPtr, _Arg, _Args...> |
: public __result_of_memfun<typename decay<_MemPtr>::type, _Arg, _Args...> |
{ }; |
|
// [func.require] paragraph 1 bullet 5: |
struct __result_of_other_impl |
{ |
template<typename _Fn, typename... _Args> |
static __success_type<decltype( |
std::declval<_Fn>()(std::declval<_Args>()...) |
)> _S_test(int); |
|
template<typename...> |
static __failure_type _S_test(...); |
}; |
|
template<typename _Functor, typename... _ArgTypes> |
struct __result_of_impl<false, false, _Functor, _ArgTypes...> |
: private __result_of_other_impl |
{ |
typedef decltype(_S_test<_Functor, _ArgTypes...>(0)) type; |
}; |
|
template<typename _Functor, typename... _ArgTypes> |
struct result_of<_Functor(_ArgTypes...)> |
: public __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 |
{ }; |
|
/// @} group metaprogramming |
|
/** |
* 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 constexpr 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> \ |
{ }; |
|
_GLIBCXX_END_NAMESPACE_VERSION |
} // namespace std |
|
#endif // C++11 |
|
#endif // _GLIBCXX_TYPE_TRAITS |