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

// Copyright (C) 2015-2021 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library.  This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 3, or (at your option)
// any later version.

// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License along
// with this library; see the file COPYING3.  If not see
// <http://www.gnu.org/licenses/>.

// { dg-do run { target c++11 } }
// COW strings don't support C++11 allocator propagation:
// { dg-require-effective-target cxx11-abi }

#include <string>
#include <testsuite_hooks.h>
#include <testsuite_allocator.h>

using C = char;
const C c = 'a';
using traits = std::char_traits<C>;

using __gnu_test::propagating_allocator;

// It is undefined behaviour to swap() containers wth unequal allocators
// if the allocator doesn't propagate, so ensure the allocators compare
// equal, while still being able to test propagation via get_personality().
bool
operator==(const propagating_allocator<C, false>&,
           const propagating_allocator<C, false>&)
{
  return true;
}

bool
operator!=(const propagating_allocator<C, false>&,
           const propagating_allocator<C, false>&)
{
  return false;
}

void test01()
{
  typedef propagating_allocator<C, false> alloc_type;
  typedef std::basic_string<C, traits, alloc_type> test_type;
  test_type v1(alloc_type(1));
  v1.push_back(C());
  test_type v2(alloc_type(2));
  v2.push_back(C());
  std::swap(v1, v2);
  VERIFY(1 == v1.get_allocator().get_personality());
  VERIFY(2 == v2.get_allocator().get_personality());
  // swap back so assertions in uneq_allocator::deallocate don't fail
  std::swap(v1, v2);
}

void test02()
{
  typedef propagating_allocator<C, true> alloc_type;
  typedef std::basic_string<C, traits, alloc_type> test_type;
  test_type v1(alloc_type(1));
  v1.push_back(C());
  test_type v2(alloc_type(2));
  v2.push_back(C());
  std::swap(v1, v2);
  VERIFY(2 == v1.get_allocator().get_personality());
  VERIFY(1 == v2.get_allocator().get_personality());
}

int main()
{
  test01();
  test02();
  return 0;
}