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

   1 // Copyright (C) 2020-2023 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 <unordered_set>
  21
  22 using type1 = std::unordered_set<int>;
  23
  24 static_assert(std::is_nothrow_default_constructible<type1>::value,
  25               "noexcept default constructible");
  26
  27 struct not_noexcept_dflt_cons_hash
  28 {
  29   not_noexcept_dflt_cons_hash() /* noexcept */;
  30
  31   std::size_t
  32   operator()(int) const noexcept;
  33 };
  34
  35 using type2 = std::unordered_set<int, not_noexcept_dflt_cons_hash>;
  36
  37 static_assert( !std::is_nothrow_default_constructible<type2>::value,
  38                "not noexcept default constructible");
  39
  40 struct not_noexcept_dflt_cons_equal_to
  41 {
  42   not_noexcept_dflt_cons_equal_to() /* noexcept */;
  43
  44   bool
  45   operator()(int, int) const noexcept;
  46 };
  47
  48 using type3 = std::unordered_set<int, std::hash<int>,
  49                                   not_noexcept_dflt_cons_equal_to>;
  50
  51 static_assert( !std::is_nothrow_default_constructible<type3>::value,
  52                "not noexcept default constructible");
  53
  54 template<typename _Tp>
  55   struct not_noexcept_dflt_cons_alloc : std::allocator<_Tp>
  56   {
  57     not_noexcept_dflt_cons_alloc() /* noexcept */;
  58
  59     template<typename _Tp1>
  60       struct rebind
  61       { typedef not_noexcept_dflt_cons_alloc<_Tp1> other; };
  62   };
  63
  64 using type4 = std::unordered_set<int, std::hash<int>, std::equal_to<int>,
  65                                  not_noexcept_dflt_cons_alloc<int>>;
  66
  67 static_assert(!std::is_nothrow_default_constructible<type4>::value,
  68               "not noexcept default constructible");