Differential D47360 Diff 219818 test/std/utilities/utility/mem.res/mem.res.monotonic.buffer/mem.res.monotonic.buffer.ctor/with_default_resource.pass.cpp

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test/std/utilities/utility/mem.res/mem.res.monotonic.buffer/mem.res.monotonic.buffer.ctor/with_default_resource.pass.cpp

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				//===----------------------------------------------------------------------===//
				//
				// The LLVM Compiler Infrastructure
				//
				// This file is dual licensed under the MIT and the University of Illinois Open
				// Source Licenses. See LICENSE.TXT for details.
				//
				//===----------------------------------------------------------------------===//

				// UNSUPPORTED: c++98, c++03

				// <memory_resource>

				// class monotonic_buffer_resource

				#include <memory_resource>
				#include <cassert>

				int main()
				{
				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);
				}
				}