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Implement the std::pair parts of "Improving pair and tuple". Completes N4387.

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git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@276605 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Eric Fiselier
2016-07-25 04:32:07 +00:00
parent 4be71c6619
commit e1445fd8ed
14 changed files with 1016 additions and 181 deletions
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54
include/tuple
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@@ -150,27 +150,6 @@ _LIBCPP_BEGIN_NAMESPACE_STD
#ifndef _LIBCPP_HAS_NO_VARIADICS
// tuple_size
template <class ..._Tp>
class _LIBCPP_TYPE_VIS_ONLY tuple_size<tuple<_Tp...> >
: public integral_constant<size_t, sizeof...(_Tp)>
{
};
// tuple_element
template <size_t _Ip, class ..._Tp>
class _LIBCPP_TYPE_VIS_ONLY tuple_element<_Ip, tuple<_Tp...> >
{
public:
typedef typename tuple_element<_Ip, __tuple_types<_Tp...> >::type type;
};
#if _LIBCPP_STD_VER > 11
template <size_t _Ip, class ..._Tp>
using tuple_element_t = typename tuple_element <_Ip, _Tp...>::type;
#endif
// __tuple_leaf
@@ -489,27 +468,7 @@ struct __tuple_impl<__tuple_indices<_Indx...>, _Tp...>
}
};
template <bool _IsTuple, class _SizeTrait, size_t _Expected>
struct __tuple_like_with_size_imp : false_type {};
template <class _SizeTrait, size_t _Expected>
struct __tuple_like_with_size_imp<true, _SizeTrait, _Expected>
: integral_constant<bool, _SizeTrait::value == _Expected> {};
template <class _Tuple, size_t _ExpectedSize,
class _RawTuple = typename __uncvref<_Tuple>::type>
using __tuple_like_with_size = __tuple_like_with_size_imp<
__tuple_like<_RawTuple>::value,
tuple_size<_RawTuple>, _ExpectedSize
>;
struct _LIBCPP_TYPE_VIS __check_tuple_constructor_fail {
template <class ...>
static constexpr bool __enable_explicit() { return false; }
template <class ...>
static constexpr bool __enable_implicit() { return false; }
};
template <class ..._Tp>
class _LIBCPP_TYPE_VIS_ONLY tuple
@@ -531,6 +490,11 @@ class _LIBCPP_TYPE_VIS_ONLY tuple
template <class _Dummy>
struct _CheckArgsConstructor<true, _Dummy>
{
template <class ..._Args>
static constexpr bool __enable_default() {
return __all<is_default_constructible<_Args>::value...>::value;
}
template <class ..._Args>
static constexpr bool __enable_explicit() {
return
@@ -641,7 +605,7 @@ class _LIBCPP_TYPE_VIS_ONLY tuple
public:
template <bool _Dummy = true, class = typename enable_if<
__all<__dependent_type<is_default_constructible<_Tp>, _Dummy>::value...>::value
_CheckArgsConstructor<_Dummy>::template __enable_default<_Tp...>()
>::type>
_LIBCPP_INLINE_VISIBILITY
_LIBCPP_CONSTEXPR tuple()
@@ -1362,6 +1326,9 @@ template <class ..._Tp, class _Alloc>
struct _LIBCPP_TYPE_VIS_ONLY uses_allocator<tuple<_Tp...>, _Alloc>
: true_type {};
#endif // _LIBCPP_HAS_NO_VARIADICS
#ifndef _LIBCPP_CXX03_LANG
template <class _T1, class _T2>
template <class... _Args1, class... _Args2, size_t ..._I1, size_t ..._I2>
inline _LIBCPP_INLINE_VISIBILITY
@@ -1372,8 +1339,7 @@ pair<_T1, _T2>::pair(piecewise_construct_t,
second(_VSTD::forward<_Args2>(_VSTD::get<_I2>(__second_args))...)
{
}
#endif // _LIBCPP_HAS_NO_VARIADICS
#endif // _LIBCPP_CXX03_LANG
#if _LIBCPP_STD_VER > 14
template <class _Tp>