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libstdc++: Remove non-void static assertions in variant's std::get [PR111172] 

A void template argument would cause a substitution failure when trying
to form a reference for the return type, so the function body would
never be instantiated.

libstdc++-v3/ChangeLog:

	PR libstdc++/111172
	* include/std/variant (get<T>): Remove !is_void static
	assertions.

(cherry picked from commit d19bdf8874)
This commit is contained in:
Jonathan Wakely 2023-09-12 21:28:38 +01:00
parent 0fc5cc6e5a
commit 9847a4e9f0
1 changed files with 0 additions and 4 deletions
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4
libstdc++-v3/include/std/variant
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@ -1151,7 +1151,6 @@ namespace __variant
{ {
static_assert(__detail::__variant::__exactly_once<_Tp, _Types...>, static_assert(__detail::__variant::__exactly_once<_Tp, _Types...>,
"T must occur exactly once in alternatives"); "T must occur exactly once in alternatives");
static_assert(!is_void_v<_Tp>, "_Tp must not be void");
constexpr size_t __n = std::__find_uniq_type_in_pack<_Tp, _Types...>(); constexpr size_t __n = std::__find_uniq_type_in_pack<_Tp, _Types...>();
return std::get<__n>(__v); return std::get<__n>(__v);
} }
@ -1162,7 +1161,6 @@ namespace __variant
{ {
static_assert(__detail::__variant::__exactly_once<_Tp, _Types...>, static_assert(__detail::__variant::__exactly_once<_Tp, _Types...>,
"T must occur exactly once in alternatives"); "T must occur exactly once in alternatives");
static_assert(!is_void_v<_Tp>, "_Tp must not be void");
constexpr size_t __n = std::__find_uniq_type_in_pack<_Tp, _Types...>(); constexpr size_t __n = std::__find_uniq_type_in_pack<_Tp, _Types...>();
return std::get<__n>(std::move(__v)); return std::get<__n>(std::move(__v));
} }
@ -1173,7 +1171,6 @@ namespace __variant
{ {
static_assert(__detail::__variant::__exactly_once<_Tp, _Types...>, static_assert(__detail::__variant::__exactly_once<_Tp, _Types...>,
"T must occur exactly once in alternatives"); "T must occur exactly once in alternatives");
static_assert(!is_void_v<_Tp>, "_Tp must not be void");
constexpr size_t __n = std::__find_uniq_type_in_pack<_Tp, _Types...>(); constexpr size_t __n = std::__find_uniq_type_in_pack<_Tp, _Types...>();
return std::get<__n>(__v); return std::get<__n>(__v);
} }
@ -1184,7 +1181,6 @@ namespace __variant
{ {
static_assert(__detail::__variant::__exactly_once<_Tp, _Types...>, static_assert(__detail::__variant::__exactly_once<_Tp, _Types...>,
"T must occur exactly once in alternatives"); "T must occur exactly once in alternatives");
static_assert(!is_void_v<_Tp>, "_Tp must not be void");
constexpr size_t __n = std::__find_uniq_type_in_pack<_Tp, _Types...>(); constexpr size_t __n = std::__find_uniq_type_in_pack<_Tp, _Types...>();
return std::get<__n>(std::move(__v)); return std::get<__n>(std::move(__v));
} }