libstdc++-v3/testsuite/23_containers/map/cons/noexcept_default_construct.cc

   1 // Copyright (C) 2016-2024 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 <map>
  21
  22 using mtype1 = std::map<int, int>;
  23 static_assert(std::is_nothrow_default_constructible<mtype1>::value, "Error");
  24
  25 struct cmp
  26 {
  27   cmp() { }
  28   bool operator()(int, int) const;
  29 };
  30
  31 using mtype2 = std::map<int, int, cmp>;
  32 static_assert( !std::is_nothrow_default_constructible<mtype2>::value, "Error");
  33
  34 template<typename _Tp>
  35   struct not_noexcept_cons_alloc : std::allocator<_Tp>
  36   {
  37     not_noexcept_cons_alloc() /* noexcept */
  38     { }
  39
  40     template<typename _Tp1>
  41       struct rebind
  42       { typedef not_noexcept_cons_alloc<_Tp1> other; };
  43   };
  44
  45 using mtype3 = std::map<int, int, std::less<int>,
  46                         not_noexcept_cons_alloc<std::pair<const int, int>>>;
  47
  48 static_assert(!std::is_nothrow_default_constructible<mtype3>::value, "Error");