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Implement LWG 2960: nonesuch is insufficiently useless

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git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@359526 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Marshall Clow
2019-04-30 00:54:38 +00:00
parent c5b17c65dc
commit cac04cde5e
4 changed files with 67 additions and 6 deletions
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10
include/experimental/type_traits
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@@ -72,6 +72,7 @@ inline namespace fundamentals_v1 {
#if _LIBCPP_STD_VER > 11
#include <initializer_list>
#include <type_traits>
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
@@ -104,11 +105,10 @@ using raw_invocation_type_t = typename raw_invocation_type<_Tp>::type;
// 3.3.4, Detection idiom
template <class...> using void_t = void;
struct nonesuch {
nonesuch() = delete;
~nonesuch() = delete;
nonesuch (nonesuch const&) = delete;
void operator=(nonesuch const&) = delete;
struct nonesuch : private _VSTD::__nat { // make nonesuch "not an aggregate"
~nonesuch() = delete;
nonesuch (nonesuch const&) = delete;
void operator=(nonesuch const&) = delete;
};
template <class _Default, class _AlwaysVoid, template <class...> class _Op, class... _Args>