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 charT* c_str() const; // 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> test(const S & s)20TEST_CONSTEXPR_CXX20 void test(const S& s) { 21 typedef typename S::traits_type T; 22 const typename S::value_type* str = s.c_str(); 23 if (s.size() > 0) { 24 assert(T::compare(str, &s[0], s.size()) == 0); 25 assert(T::eq(str[s.size()], typename S::value_type())); 26 } else 27 assert(T::eq(str[0], typename S::value_type())); 28 } 29 30 template <class S> test_string()31TEST_CONSTEXPR_CXX20 void test_string() { 32 test(S("")); 33 test(S("abcde")); 34 test(S("abcdefghij")); 35 test(S("abcdefghijklmnopqrst")); 36 } 37 test()38TEST_CONSTEXPR_CXX20 bool test() { 39 test_string<std::string>(); 40 #if TEST_STD_VER >= 11 41 test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char> > >(); 42 #endif 43 44 return true; 45 } 46 main(int,char **)47int main(int, char**) { 48 test(); 49 #if TEST_STD_VER > 17 50 static_assert(test()); 51 #endif 52 53 return 0; 54 } 55