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 // const_iterator cbegin() const; 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 typename S::const_iterator cb = s.cbegin(); 24 if (!s.empty()) 25 { 26 assert(*cb == s[0]); 27 } 28 assert(cb == s.begin()); 29 } 30 31 bool test() { 32 { 33 typedef std::string S; 34 test(S()); 35 test(S("123")); 36 } 37 #if TEST_STD_VER >= 11 38 { 39 typedef std::basic_string<char, std::char_traits<char>, min_allocator<char>> S; 40 test(S()); 41 test(S("123")); 42 } 43 #endif 44 45 return true; 46 } 47 48 int main(int, char**) 49 { 50 test(); 51 #if TEST_STD_VER > 17 52 // static_assert(test()); 53 #endif 54 55 return 0; 56 } 57