libstdc++-v3/testsuite/23_containers/unordered_map/debug/90102.cc

   1 // Copyright (C) 2020-2025 Free Software Foundation, Inc.
   2 //
   3 // This file is part of the GNU ISO C++ Library.  This library is free
   4 // software; you can redistribute it and/or modify it under the
   5 // terms of the GNU General Public License as published by the
   6 // Free Software Foundation; either version 3, or (at your option)
   7 // any later version.
   8
   9 // This library is distributed in the hope that it will be useful,
  10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 // GNU General Public License for more details.
  13
  14 // You should have received a copy of the GNU General Public License along
  15 // with this library; see the file COPYING3.  If not see
  16 // <http://www.gnu.org/licenses/>.
  17
  18 // { dg-do compile { target c++11 } }
  19
  20 #include <debug/unordered_map>
  21
  22 // PR libstdc++/90102
  23
  24 struct AnyCont
  25 {
  26   template<class Cont, class Check = decltype(std::declval<Cont>().clear())>
  27   operator Cont () const;
  28 } a;
  29
  30 // This should use copy constructor, not be ambiguous
  31 __gnu_debug::unordered_map<int, int> c(a);
  32
  33 // Ensure construction from base container still works
  34 __gnu_debug::unordered_map<int, int> d(static_cast<std::unordered_map<int, int>>(a));