Differential D47360 Diff 219818 test/std/utilities/utility/mem.res/mem.res.global/null_memory_resource.pass.cpp

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test/std/utilities/utility/mem.res/mem.res.global/null_memory_resource.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>

				// memory_resource * null_memory_resource()

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

				#include "test_macros.h"
				#include "count_new.h"

				namespace ex = std::pmr;

				struct assert_on_compare : public ex::memory_resource
				{
				protected:
				virtual void * do_allocate(size_t, size_t)
				{ assert(false); }

				virtual void do_deallocate(void *, size_t, size_t)
				{ assert(false); }

				virtual bool do_is_equal(ex::memory_resource const &) const noexcept
				{ assert(false); }
				};

				void test_return()
				{
				{
				static_assert(std::is_same<
				decltype(ex::null_memory_resource()), ex::memory_resource*
				>::value, "");
				}
				// Test that the returned value is not null
				{
				assert(ex::null_memory_resource());
				}
				// Test the same value is returned by repeated calls.
				{
				assert(ex::null_memory_resource() == ex::null_memory_resource());
				}
				}

				void test_equality()
				{
				// Same object
				{
				ex::memory_resource & r1 = *ex::null_memory_resource();
				ex::memory_resource & r2 = *ex::null_memory_resource();
				// check both calls returned the same object
				assert(&r1 == &r2);
				// check for proper equality semantics
				assert(r1 == r2);
				assert(r2 == r1);
				assert(!(r1 != r2));
				assert(!(r2 != r1));
				// check the is_equal method
				assert(r1.is_equal(r2));
				assert(r2.is_equal(r1));
				}
				// Different types
				{
				ex::memory_resource & r1 = *ex::null_memory_resource();
				assert_on_compare c;
				ex::memory_resource & r2 = c;
				assert(r1 != r2);
				assert(!(r1 == r2));
				assert(!r1.is_equal(r2));
				}
				}

				void test_allocate()
				{
				#ifndef TEST_HAS_NO_EXCEPTIONS
				DisableAllocationGuard g; // null_memory_resource shouldn't allocate.
				try {
				ex::null_memory_resource()->allocate(1);
				assert(false);
				} catch (std::bad_alloc const &) {
				// do nothing
				} catch (...) {
				assert(false);
				}
				#endif
				}

				void test_deallocate()
				{
				globalMemCounter.reset();

				int x = 42;
				ex::null_memory_resource()->deallocate(nullptr, 0);
				ex::null_memory_resource()->deallocate(&x, 0);

				assert(globalMemCounter.checkDeleteCalledEq(0));
				assert(globalMemCounter.checkDeleteArrayCalledEq(0));
				}

				int main()
				{
				test_return();
				test_equality();
				test_allocate();
				test_deallocate();
				}