[gcc(refs/vendors/ibm/heads/gcc-10-branch)] PR libstdc++/91807
Peter Bergner
bergner@gcc.gnu.org
Fri Jul 3 02:59:45 GMT 2020
https://gcc.gnu.org/g:9cba1b9a6333dcc6623865b7a0ed4d57cec4088e
commit 9cba1b9a6333dcc6623865b7a0ed4d57cec4088e
Author: Ville Voutilainen <ville.voutilainen@gmail.com>
Date: Thu Jul 2 22:16:39 2020 +0300
PR libstdc++/91807
PR libstdc++/91807
* include/std/variant
(_Copy_assign_base::operator=(const _Copy_assign_base&):
Do the move-assignment from a temporary so that the temporary
is constructed with an explicit index.
* testsuite/20_util/variant/91807.cc: New.
(cherry picked from commit dbca7a69f276e4829354f87f2747ebff36f6090e)
Diff:
---
libstdc++-v3/include/std/variant | 3 ++-
libstdc++-v3/testsuite/20_util/variant/91807.cc | 35 +++++++++++++++++++++++++
2 files changed, 37 insertions(+), 1 deletion(-)
diff --git a/libstdc++-v3/include/std/variant b/libstdc++-v3/include/std/variant
index 010138df9f2..0dc3841e777 100644
--- a/libstdc++-v3/include/std/variant
+++ b/libstdc++-v3/include/std/variant
@@ -611,7 +611,8 @@ namespace __variant
this->_M_destructive_copy(__rhs_index, __rhs_mem);
else
__variant_cast<_Types...>(*this)
- = variant<_Types...>(__rhs_mem);
+ = variant<_Types...>(std::in_place_index<__rhs_index>,
+ __rhs_mem);
}
}
else
diff --git a/libstdc++-v3/testsuite/20_util/variant/91807.cc b/libstdc++-v3/testsuite/20_util/variant/91807.cc
new file mode 100644
index 00000000000..04bb5d7c807
--- /dev/null
+++ b/libstdc++-v3/testsuite/20_util/variant/91807.cc
@@ -0,0 +1,35 @@
+// { dg-options "-std=gnu++17" }
+// { dg-do compile { target c++17 } }
+
+// Copyright (C) 2020 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library. This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3. If not see
+// <http://www.gnu.org/licenses/>.
+
+#include <variant>
+
+struct me_data {
+ me_data() = default;
+
+ me_data(const me_data &) {};
+ me_data(me_data &&) noexcept {};
+ me_data& operator=(const me_data &) = default;
+};
+
+int main() {
+ std::variant<me_data, me_data> v1, v2;
+
+ v2 = v1;
+}
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