This fixes a regression on all active branches. Tested aarch64-linux.
-- >8 -- I caused a regression with commit r10-908 by adding a constraint to the non-explicit allocator-extended default constructor, but seemingly forgot to add an explicit overload with the corresponding constraint. libstdc++-v3/ChangeLog: PR libstdc++/114147 * include/std/tuple (tuple::tuple(allocator_arg_t, const Alloc&)): Add missing overload of allocator-extended default constructor. (tuple<T1,T2>::tuple(allocator_arg_t, const Alloc&)): Likewise. * testsuite/20_util/tuple/cons/114147.cc: New test. --- libstdc++-v3/include/std/tuple | 14 ++++++++++++++ .../testsuite/20_util/tuple/cons/114147.cc | 15 +++++++++++++++ 2 files changed, 29 insertions(+) create mode 100644 libstdc++-v3/testsuite/20_util/tuple/cons/114147.cc diff --git a/libstdc++-v3/include/std/tuple b/libstdc++-v3/include/std/tuple index 9c89c13ab84..3065058e184 100644 --- a/libstdc++-v3/include/std/tuple +++ b/libstdc++-v3/include/std/tuple @@ -1550,6 +1550,13 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION tuple(allocator_arg_t __tag, const _Alloc& __a) : _Inherited(__tag, __a) { } + template<typename _Alloc, + _ExplicitDefaultCtor<is_object<_Alloc>::value> = false> + _GLIBCXX20_CONSTEXPR + explicit + tuple(allocator_arg_t __tag, const _Alloc& __a) + : _Inherited(__tag, __a) { } + template<typename _Alloc, bool _NotEmpty = (sizeof...(_Elements) >= 1), _ImplicitCtor<_NotEmpty, const _Elements&...> = true> _GLIBCXX20_CONSTEXPR @@ -2198,6 +2205,13 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION tuple(allocator_arg_t __tag, const _Alloc& __a) : _Inherited(__tag, __a) { } + template<typename _Alloc, + _ExplicitDefaultCtor<is_object<_Alloc>::value, _T1, _T2> = false> + _GLIBCXX20_CONSTEXPR + explicit + tuple(allocator_arg_t __tag, const _Alloc& __a) + : _Inherited(__tag, __a) { } + template<typename _Alloc, bool _Dummy = true, _ImplicitCtor<_Dummy, const _T1&, const _T2&> = true> _GLIBCXX20_CONSTEXPR diff --git a/libstdc++-v3/testsuite/20_util/tuple/cons/114147.cc b/libstdc++-v3/testsuite/20_util/tuple/cons/114147.cc new file mode 100644 index 00000000000..916e7204964 --- /dev/null +++ b/libstdc++-v3/testsuite/20_util/tuple/cons/114147.cc @@ -0,0 +1,15 @@ +// { dg-do compile { target c++11 } } + +// PR libstdc++/114147 +// tuple allocator-extended ctor requires non-explicit default ctor + +#include <tuple> +#include <memory> + +struct X { explicit X(); }; + +std::allocator<int> a; +std::tuple<X> t0(std::allocator_arg, a); +std::tuple<int, X> t1(std::allocator_arg, a); +std::tuple<X, int> t2(std::allocator_arg, a); +std::tuple<int, X, int> t3(std::allocator_arg, a); -- 2.43.2