Differential D47360 Diff 219818 test/std/utilities/utility/mem.res/mem.res.aliases/header_string_synop.pass.cpp

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test/std/utilities/utility/mem.res/mem.res.aliases/header_string_synop.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

				// <string>

				// namespace std::pmr {
				// template <class Char, class Traits = ...>
				// using basic_string =
				// ::std::basic_string<Char, Traits, polymorphic_allocator<Char>>
				//
				// typedef ... string
				// typedef ... u16string
				// typedef ... u32string
				// typedef ... wstring
				//
				// } // namespace std::pmr

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

				#include "constexpr_char_traits.h"

				namespace pmr = std::pmr;

				template <class Char, class PmrTypedef>
				void test_string_typedef() {
				using StdStr = std::basic_string<Char, std::char_traits<Char>,
				std::pmr::polymorphic_allocator<Char>>;
				using PmrStr = std::pmr::basic_string<Char>;
				static_assert(std::is_same<StdStr, PmrStr>::value, "");
				static_assert(std::is_same<PmrStr, PmrTypedef>::value, "");
				}

				template <class Char, class Traits>
				void test_basic_string_alias() {
				using StdStr = std::basic_string<Char, Traits,
				std::pmr::polymorphic_allocator<Char>>;
				using PmrStr = std::pmr::basic_string<Char, Traits>;
				static_assert(std::is_same<StdStr, PmrStr>::value, "");
				}

				int main(int, char**)
				{
				{
				test_string_typedef<char, std::pmr::string>();
				test_string_typedef<wchar_t, std::pmr::wstring>();
				test_string_typedef<char16_t, std::pmr::u16string>();
				test_string_typedef<char32_t, std::pmr::u32string>();
				}
				{
				test_basic_string_alias<char, constexpr_char_traits<char>>();
				test_basic_string_alias<wchar_t, constexpr_char_traits<wchar_t>>();
				test_basic_string_alias<char16_t, constexpr_char_traits<char16_t>>();
				test_basic_string_alias<char32_t, constexpr_char_traits<char32_t>>();
				}
				{
				// Check that std::basic_string has been included and is complete.
				std::pmr::string s;
				assert(s.get_allocator().resource() == std::pmr::get_default_resource());
				}

				return 0;
				}