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; 12 13 #include <string> 14 #include <cassert> 15 16 #include "test_macros.h" 17 #include "min_allocator.h" 18 19 template <class S> 20 TEST_CONSTEXPR_CXX20 void 21 test(const S& s) 22 { 23 ASSERT_NOEXCEPT(s.empty()); 24 assert(s.empty() == (s.size() == 0)); 25 } 26 27 bool test() { 28 { 29 typedef std::string S; 30 test(S()); 31 test(S("123")); 32 test(S("12345678901234567890123456789012345678901234567890")); 33 } 34 #if TEST_STD_VER >= 11 35 { 36 typedef std::basic_string<char, std::char_traits<char>, min_allocator<char>> S; 37 test(S()); 38 test(S("123")); 39 test(S("12345678901234567890123456789012345678901234567890")); 40 } 41 #endif 42 43 return true; 44 } 45 46 int main(int, char**) 47 { 48 test(); 49 #if TEST_STD_VER > 17 50 // static_assert(test()); 51 #endif 52 53 return 0; 54 } 55