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 // iterator end(); // constexpr since C++20 12 // const_iterator end() const; // constexpr since C++20 13 14 #include <string> 15 #include <cassert> 16 #include <cstddef> 17 18 #include "test_macros.h" 19 #include "min_allocator.h" 20 21 template <class S> test(S s)22TEST_CONSTEXPR_CXX20 void test(S s) { 23 const S& cs = s; 24 typename S::iterator e = s.end(); 25 typename S::const_iterator ce = cs.end(); 26 if (s.empty()) { 27 assert(e == s.begin()); 28 assert(ce == cs.begin()); 29 } 30 assert(static_cast<std::size_t>(e - s.begin()) == s.size()); 31 assert(static_cast<std::size_t>(ce - cs.begin()) == cs.size()); 32 } 33 34 template <class S> test_string()35TEST_CONSTEXPR_CXX20 void test_string() { 36 test(S()); 37 test(S("123")); 38 } 39 test()40TEST_CONSTEXPR_CXX20 bool test() { 41 test_string<std::string>(); 42 #if TEST_STD_VER >= 11 43 test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char> > >(); 44 #endif 45 46 return true; 47 } 48 main(int,char **)49int main(int, char**) { 50 test(); 51 #if TEST_STD_VER > 17 52 static_assert(test()); 53 #endif 54 55 return 0; 56 } 57