Differential D47360 Diff 219818 test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/destroy.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

				// template <class U>
				// void polymorphic_allocator<T>::destroy(U * ptr);

				#include <memory_resource>
				#include <type_traits>
				#include <new>
				#include <cassert>
				#include <cstdlib>

				namespace ex = std::pmr;

				int count = 0;

				struct destroyable
				{
				destroyable() { ++count; }
				~destroyable() { --count; }
				};

				int main(int, char**)
				{
				typedef ex::polymorphic_allocator<double> A;
				{
				A a;
				static_assert(
				std::is_same<decltype(a.destroy((destroyable*)nullptr)), void>::value,
				"");
				}
				{
				destroyable * ptr = ::new (std::malloc(sizeof(destroyable))) destroyable();
				assert(count == 1);
				A{}.destroy(ptr);
				assert(count == 0);
				std::free(ptr);
				}

				return 0;
				}