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Fix http://llvm.org/bugs/show_bug.cgi?id=11616

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git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@146881 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Howard Hinnant
2011-12-19 17:58:44 +00:00
parent 83b2c84a3c
commit 6cc99fa338
3 changed files with 139 additions and 61 deletions
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61
include/tuple
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@@ -116,8 +116,9 @@ template <class... Types>
#include <__config>
#include <__tuple>
#include <cstddef>
#include <memory>
#include <type_traits>
#include <__functional_base>
#include <utility>
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
#pragma GCC system_header
@@ -125,6 +126,64 @@ template <class... Types>
_LIBCPP_BEGIN_NAMESPACE_STD
// allocator_arg_t
struct _LIBCPP_VISIBLE allocator_arg_t { };
extern const allocator_arg_t allocator_arg;
// uses_allocator
template <class _Tp>
struct __has_allocator_type
{
private:
struct __two {char _; char __;};
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_VISIBLE 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