libstdc++-v3/testsuite/21_strings/basic_string/allocator/71964.cc

   1 // Copyright (C) 2016-2018 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 // COW strings don't support C++11 allocators:
  20 // { dg-require-effective-target cxx11-abi }
  21
  22 #include <string>
  23 #include <testsuite_hooks.h>
  24
  25 template<typename T>
  26   struct mv_allocator
  27   {
  28     using value_type = T;
  29     using size_type = unsigned;
  30
  31     mv_allocator()
  32     : moved_to(false), moved_from(false) { }
  33
  34     template<typename U>
  35       mv_allocator(const mv_allocator<U> & a)
  36       : moved_to(a.moved_to), moved_from(a.moved_from) { }
  37
  38     mv_allocator(const mv_allocator &) = default;
  39
  40     mv_allocator(mv_allocator && a) noexcept : moved_to(true)
  41     {
  42       a.moved_from = true;
  43     }
  44
  45     T* allocate(unsigned n) { return std::allocator<T>{}.allcoate(n); }
  46     void deallocate(T* p, unsigned n) { std::allocator<T>{}.deallocate(p, n); }
  47
  48     bool moved_to;
  49     bool moved_from;
  50   };
  51
  52 template<typename T, typename U>
  53 bool
  54 operator==(const mv_allocator<T>&, const mv_allocator<U>&) { return true; }
  55
  56 template<typename T, typename U>
  57 bool
  58 operator!=(const mv_allocator<T>&, const mv_allocator<U>&) { return false; }
  59
  60 void
  61 test01()
  62 {
  63   std::basic_string<char, std::char_traits<char>, mv_allocator<char>> s;
  64   auto t = std::move(s);
  65   VERIFY( s.get_allocator().moved_from );
  66   VERIFY( t.get_allocator().moved_to );
  67 }
  68
  69 int
  70 main()
  71 {
  72   test01();
  73 }