Differential D47360 Diff 219818 test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.ctor/default.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>

				// template <class T> class polymorphic_allocator

				// polymorphic_allocator<T>::polymorphic_allocator() noexcept

				#include <memory_resource>
				#include <type_traits>
				#include <cassert>

				#include "test_std_memory_resource.h"

				namespace ex = std::pmr;

				int main(int, char**)
				{
				{
				static_assert(
				std::is_nothrow_default_constructible<ex::polymorphic_allocator<void>>::value
				, "Must me nothrow default constructible"
				);
				}
				{
				// test that the allocator gets its resource from get_default_resource
				TestResource R1(42);
				ex::set_default_resource(&R1);

				typedef ex::polymorphic_allocator<void> A;
				A const a;
				assert(a.resource() == &R1);

				ex::set_default_resource(nullptr);
				A const a2;
				assert(a.resource() == &R1);
				assert(a2.resource() == ex::new_delete_resource());
				}

				return 0;
				}