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re PR libstdc++/79513 (std::visit doesn't handle references) 

PR libstdc++/79513
	* include/std/variant (visit()): Forward variant types to the return
	type detection code.
	* testsuite/20_util/variant/compile.cc: Add test cases.

From-SVN: r245474
This commit is contained in:
Tim Shen 2017-02-15 07:38:20 +00:00 committed by Tim Shen
parent fdbb46228f
commit 7d5abe42c2
3 changed files with 15 additions and 1 deletions
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7
libstdc++-v3/ChangeLog
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@ -1,3 +1,10 @@
2017-02-15 Tim Shen <timshen@google.com>
PR libstdc++/79513
* include/std/variant (visit()): Forward variant types to the return
type detection code.
* testsuite/20_util/variant/compile.cc: Add test cases.
2017-02-13 H.J. Lu <hongjiu.lu@intel.com> 2017-02-13 H.J. Lu <hongjiu.lu@intel.com>
PR libstdc++/79348 PR libstdc++/79348

3
libstdc++-v3/include/std/variant
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@ -1263,7 +1263,8 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
__throw_bad_variant_access("Unexpected index"); __throw_bad_variant_access("Unexpected index");
using _Result_type = using _Result_type =
decltype(std::forward<_Visitor>(__visitor)(get<0>(__variants)...)); decltype(std::forward<_Visitor>(__visitor)(
get<0>(std::forward<_Variants>(__variants))...));
constexpr auto& __vtable = __detail::__variant::__gen_vtable< constexpr auto& __vtable = __detail::__variant::__gen_vtable<
_Result_type, _Visitor&&, _Variants&&...>::_S_vtable; _Result_type, _Visitor&&, _Variants&&...>::_S_vtable;

6
libstdc++-v3/testsuite/20_util/variant/compile.cc
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@ -291,6 +291,12 @@ void test_visit()
}; };
static_assert(visit(Visitor(), variant<int, nonliteral>(0)), ""); static_assert(visit(Visitor(), variant<int, nonliteral>(0)), "");
} }
// PR libstdc++/79513
{
std::variant<int> v [[gnu::unused]] (5);
std::visit([](int&){}, v);
std::visit([](int&&){}, std::move(v));
}
} }
void test_constexpr() void test_constexpr()