libstdc++-v3/testsuite/23_containers/set/allocator/71964.cc

   1 // Copyright (C) 2016-2025 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 run { target c++11 } }
  19
  20 #include <set>
  21 #include <testsuite_hooks.h>
  22
  23 template<typename T>
  24   struct mv_allocator
  25   {
  26     using value_type = T;
  27     using size_type = unsigned;
  28
  29     mv_allocator()
  30     : moved_to(false), moved_from(false) { }
  31
  32     template<typename U>
  33       mv_allocator(const mv_allocator<U> & a)
  34       : moved_to(a.moved_to), moved_from(a.moved_from) { }
  35
  36     mv_allocator(const mv_allocator &) = default;
  37
  38     mv_allocator(mv_allocator && a) noexcept : moved_to(true)
  39     {
  40       a.moved_from = true;
  41     }
  42
  43     T* allocate(unsigned n) { return std::allocator<T>{}.allocate(n); }
  44     void deallocate(T* p, unsigned n) { std::allocator<T>{}.deallocate(p, n); }
  45
  46     bool moved_to;
  47     bool moved_from;
  48   };
  49
  50 template<typename T, typename U>
  51 bool
  52 operator==(const mv_allocator<T>&, const mv_allocator<U>&) { return true; }
  53
  54 template<typename T, typename U>
  55 bool
  56 operator!=(const mv_allocator<T>&, const mv_allocator<U>&) { return false; }
  57
  58 void
  59 test01()
  60 {
  61   std::set<int, std::less<int>, mv_allocator<int>> s;
  62   auto t = std::move(s);
  63   VERIFY( s.get_allocator().moved_from );
  64   VERIFY( t.get_allocator().moved_to );
  65 }
  66
  67 int
  68 main()
  69 {
  70   test01();
  71 }