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-exception 6 // 7 //===----------------------------------------------------------------------===// 8 9 // <string> 10 11 // bool empty() const noexcept; // constexpr since C++20 12 13 #include <string> 14 #include <cassert> 15 16 #include "test_macros.h" 17 #include "min_allocator.h" 18 19 template <class S> test(const S & s)20TEST_CONSTEXPR_CXX20 void test(const S& s) { 21 ASSERT_NOEXCEPT(s.empty()); 22 assert(s.empty() == (s.size() == 0)); 23 } 24 25 template <class S> test_string()26TEST_CONSTEXPR_CXX20 void test_string() { 27 test(S()); 28 test(S("123")); 29 test(S("12345678901234567890123456789012345678901234567890")); 30 } 31 test()32TEST_CONSTEXPR_CXX20 bool test() { 33 test_string<std::string>(); 34 #if TEST_STD_VER >= 11 35 test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char>>>(); 36 #endif 37 38 return true; 39 } 40 main(int,char **)41int main(int, char**) { 42 test(); 43 #if TEST_STD_VER > 17 44 static_assert(test()); 45 #endif 46 47 return 0; 48 } 49