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riscv-gcc-1
Commit 4d023b5b by Jonathan Wakely Committed by Jonathan Wakely
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* include/std/variant (__accepted_index): Use void_t. 

From-SVN: r262471
parent f9ccb8c0
Showing with 7 additions and 3 deletions
libstdc++-v3/ChangeLog
2018-07-06 Jonathan Wakely <jwakely@redhat.com>
* include/std/variant (__accepted_index): Use void_t.
2018-07-05 Jonathan Wakely <jwakely@redhat.com>
PR libstdc++/85831
......
libstdc++-v3/include/std/variant
......@@ -710,7 +710,8 @@ namespace __variant
};
// Helper for variant(_Tp&&) and variant::operator=(_Tp&&).
// __accepted_index maps the arbitrary _Tp to an alternative type in _Variant.
// __accepted_index maps an arbitrary _Tp to an alternative type in _Variant
// (or to variant_npos).
template<typename _Tp, typename _Variant, typename = void>
struct __accepted_index
{ static constexpr size_t value = variant_npos; };
......@@ -718,8 +719,7 @@ namespace __variant
template<typename _Tp, typename... _Types>
struct __accepted_index<
_Tp, variant<_Types...>,
decltype(__overload_set<_Types...>::_S_fun(std::declval<_Tp>()),
std::declval<void>())>
void_t<decltype(__overload_set<_Types...>::_S_fun(std::declval<_Tp>()))>>
{
static constexpr size_t value = sizeof...(_Types) - 1
- decltype(__overload_set<_Types...>::
......
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