Differential D47360 Diff 219818 test/std/utilities/utility/mem.res/mem.res/mem.res.public/dtor.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>

				//------------------------------------------------------------------------------
				// TESTING virtual ~memory_resource()
				//
				// Concerns:
				// A) 'memory_resource' is destructible.
				// B) The destructor is implicitly marked noexcept.
				// C) The destructor is marked virtual.

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

				#include "test_std_memory_resource.h"

				using std::pmr::memory_resource;

				int main()
				{
				static_assert(
				std::has_virtual_destructor<memory_resource>::value
				, "Must have virtual destructor"
				);
				static_assert(
				std::is_nothrow_destructible<memory_resource>::value,
				"Must be nothrow destructible"
				);
				static_assert(
				std::is_abstract<memory_resource>::value
				, "Must be abstract"
				);
				// Check that the destructor of `TestResource` is called when
				// it is deleted as a pointer to `memory_resource`
				{
				using TR = TestResource;
				memory_resource* M = new TR(42);
				assert(TR::resource_alive == 1);
				assert(TR::resource_constructed == 1);
				assert(TR::resource_destructed == 0);

				delete M;

				assert(TR::resource_alive == 0);
				assert(TR::resource_constructed == 1);
				assert(TR::resource_destructed == 1);
				}
				}