Differential D47360 Diff 219818 test/std/utilities/utility/mem.res/mem.res.pool/mem.res.pool.ctor/ctor_does_not_allocate.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 synchronized_pool_resource
				// class unsynchronized_pool_resource

				#include <memory_resource>
				#include <cassert>

				#include "count_new.h"

				template<class PoolResource>
				void test()
				{
				// Constructing a pool resource should not cause allocations
				// by itself; the resource should wait to allocate until an
				// allocation is requested.

				globalMemCounter.reset();
				std::pmr::set_default_resource(std::pmr::new_delete_resource());

				PoolResource r1;
				assert(globalMemCounter.checkNewCalledEq(0));

				PoolResource r2(std::pmr::pool_options{ 1024, 2048 });
				assert(globalMemCounter.checkNewCalledEq(0));

				PoolResource r3(std::pmr::pool_options{ 1024, 2048 }, std::pmr::new_delete_resource());
				assert(globalMemCounter.checkNewCalledEq(0));
				}

				int main()
				{
				test<std::pmr::unsynchronized_pool_resource>();
				test<std::pmr::synchronized_pool_resource>();
				}