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Fix PR31916 - std::visit rejects visitors accepting lvalue arguments

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A static assertion was misfiring since it checked
is_callable<Visitor, decltype(__variant_alt<T>.value)>. However
the decltype expression doesn't capture the value category as
required. This patch applies extra braces to decltype to fix
that.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@294612 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Eric Fiselier
2017-02-09 19:01:22 +00:00
parent 5a0c9c3d7a
commit d8b62dceb2
2 changed files with 12 additions and 1 deletions
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2
include/variant
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@@ -578,7 +578,7 @@ private:
constexpr decltype(auto) operator()(_Alts&&... __alts) const {
__std_visit_exhaustive_visitor_check<
_Visitor,
decltype(_VSTD::forward<_Alts>(__alts).__value)...>();
decltype((_VSTD::forward<_Alts>(__alts).__value))...>();
return __invoke_constexpr(_VSTD::forward<_Visitor>(__visitor),
_VSTD::forward<_Alts>(__alts).__value...);
}