third_party/llvm-project/libcxx/test/std/utilities/utility/mem.res/mem.res.monotonic.buffer/mem.res.monotonic.buffer.ctor/with_default_resource.pass.cpp

//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

// UNSUPPORTED: c++03, c++11, c++14
// XFAIL: availability-pmr-missing

// <memory_resource>

// class monotonic_buffer_resource

#include <memory_resource>
#include <cassert>

int main(int, char**) {
  std::pmr::memory_resource* expected = std::pmr::null_memory_resource();
  std::pmr::set_default_resource(expected);
  {
    char buffer[16];
    std::pmr::monotonic_buffer_resource r1;
    std::pmr::monotonic_buffer_resource r2(16);
    std::pmr::monotonic_buffer_resource r3(buffer, sizeof buffer);
    assert(r1.upstream_resource() == expected);
    assert(r2.upstream_resource() == expected);
    assert(r3.upstream_resource() == expected);
  }

  expected = std::pmr::new_delete_resource();
  std::pmr::set_default_resource(expected);
  {
    char buffer[16];
    std::pmr::monotonic_buffer_resource r1;
    std::pmr::monotonic_buffer_resource r2(16);
    std::pmr::monotonic_buffer_resource r3(buffer, sizeof buffer);
    assert(r1.upstream_resource() == expected);
    assert(r2.upstream_resource() == expected);
    assert(r3.upstream_resource() == expected);
  }

  return 0;
}