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