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From: William Schmidt <wschmidt@gcc.gnu.org> To: gcc-cvs@gcc.gnu.org, libstdc++-cvs@gcc.gnu.org Subject: [gcc(refs/users/wschmidt/heads/builtins3)] libstdc++: Use correct argument type for __use_alloc [PR 96803] Date: Fri, 28 Aug 2020 20:02:53 +0000 (GMT) [thread overview] Message-ID: <20200828200253.AC5C03850432@sourceware.org> (raw) 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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