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Implement uses-allocator construction

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git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@190571 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Marshall Clow
2013-09-12 02:11:16 +00:00
parent f9d2680e19
commit 599e60d2f7
2 changed files with 92 additions and 62 deletions
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62
include/tuple
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@@ -133,68 +133,6 @@ template <class... Types>
_LIBCPP_BEGIN_NAMESPACE_STD
// allocator_arg_t
struct _LIBCPP_TYPE_VIS_ONLY allocator_arg_t { };
#if defined(_LIBCPP_HAS_NO_CONSTEXPR) || defined(_LIBCPP_BUILDING_MEMORY)
extern const allocator_arg_t allocator_arg;
#else
constexpr allocator_arg_t allocator_arg = allocator_arg_t();
#endif
// uses_allocator
template <class _Tp>
struct __has_allocator_type
{
private:
struct __two {char __lx; char __lxx;};
template <class _Up> static __two __test(...);
template <class _Up> static char __test(typename _Up::allocator_type* = 0);
public:
static const bool value = sizeof(__test<_Tp>(0)) == 1;
};
template <class _Tp, class _Alloc, bool = __has_allocator_type<_Tp>::value>
struct __uses_allocator
: public integral_constant<bool,
is_convertible<_Alloc, typename _Tp::allocator_type>::value>
{
};
template <class _Tp, class _Alloc>
struct __uses_allocator<_Tp, _Alloc, false>
: public false_type
{
};
template <class _Tp, class _Alloc>
struct _LIBCPP_TYPE_VIS_ONLY uses_allocator
: public __uses_allocator<_Tp, _Alloc>
{
};
#ifndef _LIBCPP_HAS_NO_VARIADICS
// uses-allocator construction
template <class _Tp, class _Alloc, class ..._Args>
struct __uses_alloc_ctor_imp
{
static const bool __ua = uses_allocator<_Tp, _Alloc>::value;
static const bool __ic =
is_constructible<_Tp, allocator_arg_t, _Alloc, _Args...>::value;
static const int value = __ua ? 2 - __ic : 0;
};
template <class _Tp, class _Alloc, class ..._Args>
struct __uses_alloc_ctor
: integral_constant<int, __uses_alloc_ctor_imp<_Tp, _Alloc, _Args...>::value>
{};
#endif // _LIBCPP_HAS_NO_VARIADICS
#ifndef _LIBCPP_HAS_NO_VARIADICS
// tuple_size