Differential D47360 Diff 219818 test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/construct_pair.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 U1, class U2>
				// void polymorphic_allocator<T>::construct(pair<U1, U2>*)

				#include <memory_resource>
				#include <type_traits>
				#include <utility>
				#include <tuple>
				#include <cassert>
				#include <cstdlib>
				#include "uses_alloc_types.h"

				namespace ex = std::pmr;

				int constructed = 0;

				struct default_constructible
				{
				default_constructible() : x(42) { ++constructed; }
				int x{0};
				};

				int main(int, char**)
				{
				// pair<default_constructible, default_constructible> as T()
				{
				typedef default_constructible T;
				typedef std::pair<T, T> P;
				typedef ex::polymorphic_allocator<void> A;
				P * ptr = (P*)std::malloc(sizeof(P));
				A a;
				a.construct(ptr);
				assert(constructed == 2);
				assert(ptr->first.x == 42);
				assert(ptr->second.x == 42);
				std::free(ptr);
				}

				return 0;
				}