49 lines · cpp
1//===----------------------------------------------------------------------===//2//3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.4// See https://llvm.org/LICENSE.txt for license information.5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception6//7//===----------------------------------------------------------------------===//8 9// <string>10 11// bool empty() const noexcept; // constexpr since C++2012 13#include <string>14#include <cassert>15 16#include "test_macros.h"17#include "min_allocator.h"18 19template <class S>20TEST_CONSTEXPR_CXX20 void test(const S& s) {21 ASSERT_NOEXCEPT(s.empty());22 assert(s.empty() == (s.size() == 0));23}24 25template <class S>26TEST_CONSTEXPR_CXX20 void test_string() {27 test(S());28 test(S("123"));29 test(S("12345678901234567890123456789012345678901234567890"));30}31 32TEST_CONSTEXPR_CXX20 bool test() {33 test_string<std::string>();34#if TEST_STD_VER >= 1135 test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char>>>();36#endif37 38 return true;39}40 41int main(int, char**) {42 test();43#if TEST_STD_VER > 1744 static_assert(test());45#endif46 47 return 0;48}49