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LWG Issue 2247: Implement type trait 'is_null_pointer'

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git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@192049 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Marshall Clow
2013-10-05 21:21:17 +00:00
parent 320c80fecf
commit 79d8c99a62
15 changed files with 98 additions and 1 deletions
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8
include/type_traits
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@@ -28,6 +28,7 @@ namespace std
// Primary classification traits:
template <class T> struct is_void;
template <class T> struct is_null_pointer; // C++14
template <class T> struct is_integral;
template <class T> struct is_floating_point;
template <class T> struct is_array;
@@ -298,6 +299,11 @@ template <> struct ____is_nullptr_t<nullptr_t> : public true_type {};
template <class _Tp> struct _LIBCPP_TYPE_VIS_ONLY __is_nullptr_t
: public ____is_nullptr_t<typename remove_cv<_Tp>::type> {};
#if _LIBCPP_STD_VER > 11
template <class _Tp> struct _LIBCPP_TYPE_VIS_ONLY is_null_pointer
: public ____is_nullptr_t<typename remove_cv<_Tp>::type> {};
#endif
// is_integral
template <class _Tp> struct __is_integral : public false_type {};
@@ -422,7 +428,7 @@ template <class _Tp, bool = is_class<_Tp>::value ||
is_union<_Tp>::value ||
is_void<_Tp>::value ||
is_reference<_Tp>::value ||
is_same<_Tp, nullptr_t>::value >
__is_nullptr_t<_Tp>::value >
struct __is_function
: public integral_constant<bool, sizeof(__is_function_imp::__test<_Tp>(__is_function_imp::__source<_Tp>())) == 1>
{};