Differential D47360 Diff 219818 test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/select_on_container_copy_construction.pass.cpp

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test/std/utilities/utility/mem.res/mem.poly.allocator.class/mem.poly.allocator.mem/select_on_container_copy_construction.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
				// polymorphic_allocator<T>::select_on_container_copy_construction() const

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

				namespace ex = std::pmr;

				int main(int, char**)
				{
				typedef ex::polymorphic_allocator<void> A;
				{
				A const a;
				static_assert(
				std::is_same<decltype(a.select_on_container_copy_construction()), A>::value,
				"");
				}
				{
				ex::memory_resource * mptr = (ex::memory_resource*)42;
				A const a(mptr);
				assert(a.resource() == mptr);
				A const other = a.select_on_container_copy_construction();
				assert(other.resource() == ex::get_default_resource());
				assert(a.resource() == mptr);
				}
				{
				ex::memory_resource * mptr = (ex::memory_resource*)42;
				ex::set_default_resource(mptr);
				A const a(nullptr);
				assert(a.resource() == nullptr);
				A const other = a.select_on_container_copy_construction();
				assert(other.resource() == ex::get_default_resource());
				assert(other.resource() == mptr);
				assert(a.resource() == nullptr);
				}

				return 0;
				}