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* [gcc(refs/users/wschmidt/heads/sibfix)] libstdc++: Use correct argument type for __use_alloc [PR 96803]
@ 2020-08-28 13:41 William Schmidt
0 siblings, 0 replies; only message in thread
From: William Schmidt @ 2020-08-28 13:41 UTC (permalink / raw)
To: gcc-cvs, libstdc++-cvs
https://gcc.gnu.org/g:5494edae83ad33c769bd1ebc98f0c492453a6417
commit 5494edae83ad33c769bd1ebc98f0c492453a6417
Author: Jonathan Wakely <jwakely@redhat.com>
Date: Wed Aug 26 19:32:30 2020 +0100
libstdc++: Use correct argument type for __use_alloc [PR 96803]
The _Tuple_impl constructor for allocator-extended construction from a
different tuple type uses the _Tuple_impl's own _Head type in the
__use_alloc test. That is incorrect, because the argument tuple could
have a different type. Using the wrong type might select the
leading-allocator convention when it should use the trailing-allocator
convention, or vice versa.
libstdc++-v3/ChangeLog:
PR libstdc++/96803
* include/std/tuple
(_Tuple_impl(allocator_arg_t, Alloc, const _Tuple_impl<U...>&)):
Replace parameter pack with a type parameter and a pack and pass
the first type to __use_alloc.
* testsuite/20_util/tuple/cons/96803.cc: New test.
Diff:
---
libstdc++-v3/include/std/tuple | 10 +++---
libstdc++-v3/testsuite/20_util/tuple/cons/96803.cc | 41 ++++++++++++++++++++++
2 files changed, 46 insertions(+), 5 deletions(-)
diff --git a/libstdc++-v3/include/std/tuple b/libstdc++-v3/include/std/tuple
index d4a35f0fe7f..7be9943e34a 100644
--- a/libstdc++-v3/include/std/tuple
+++ b/libstdc++-v3/include/std/tuple
@@ -338,14 +338,14 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
_Base(__use_alloc<_Head, _Alloc, _Head>(__a),
std::forward<_Head>(_M_head(__in))) { }
- template<typename _Alloc, typename... _UElements>
+ template<typename _Alloc, typename _UHead, typename... _UTails>
_GLIBCXX20_CONSTEXPR
_Tuple_impl(allocator_arg_t __tag, const _Alloc& __a,
- const _Tuple_impl<_Idx, _UElements...>& __in)
+ const _Tuple_impl<_Idx, _UHead, _UTails...>& __in)
: _Inherited(__tag, __a,
- _Tuple_impl<_Idx, _UElements...>::_M_tail(__in)),
- _Base(__use_alloc<_Head, _Alloc, _Head>(__a),
- _Tuple_impl<_Idx, _UElements...>::_M_head(__in)) { }
+ _Tuple_impl<_Idx, _UHead, _UTails...>::_M_tail(__in)),
+ _Base(__use_alloc<_Head, _Alloc, _UHead>(__a),
+ _Tuple_impl<_Idx, _UHead, _UTails...>::_M_head(__in)) { }
template<typename _Alloc, typename _UHead, typename... _UTails>
_GLIBCXX20_CONSTEXPR
diff --git a/libstdc++-v3/testsuite/20_util/tuple/cons/96803.cc b/libstdc++-v3/testsuite/20_util/tuple/cons/96803.cc
new file mode 100644
index 00000000000..9d3c07d55b2
--- /dev/null
+++ b/libstdc++-v3/testsuite/20_util/tuple/cons/96803.cc
@@ -0,0 +1,41 @@
+// 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/>.
+
+// { dg-do compile { target c++11 } }
+
+#include <tuple>
+#include <memory>
+
+struct X
+{
+ using allocator_type = std::allocator<int>;
+
+ X(X&&) { }
+ X(std::allocator_arg_t, const allocator_type&, X&&) { }
+
+ explicit X(int) { }
+ explicit X(int, allocator_type) { }
+};
+
+void
+test01()
+{
+ // PR libstdc++/96803
+ // std::tuple chooses wrong constructor for uses-allocator construction
+ std::tuple<int> o;
+ std::tuple<X> nok(std::allocator_arg, std::allocator<int>(), o);
+}
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