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 // void clear(); // 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> 20 TEST_CONSTEXPR_CXX20 void 21 test(S s) 22 { 23 s.clear(); 24 assert(s.size() == 0); 25 } 26 27 TEST_CONSTEXPR_CXX20 bool test() { 28 { 29 typedef std::string S; 30 S s; 31 test(s); 32 33 s.assign(10, 'a'); 34 s.erase(5); 35 test(s); 36 37 s.assign(100, 'a'); 38 s.erase(50); 39 test(s); 40 } 41 #if TEST_STD_VER >= 11 42 { 43 typedef std::basic_string<char, std::char_traits<char>, min_allocator<char>> S; 44 S s; 45 test(s); 46 47 s.assign(10, 'a'); 48 s.erase(5); 49 test(s); 50 51 s.assign(100, 'a'); 52 s.erase(50); 53 test(s); 54 } 55 #endif 56 57 return true; 58 } 59 60 int main(int, char**) 61 { 62 test(); 63 #if TEST_STD_VER > 17 64 static_assert(test()); 65 #endif 66 67 return 0; 68 } 69