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 // basic_string<charT,traits,Allocator>& assign(const charT* s); // constexpr since C++20 12 13 #include <string> 14 #include <stdexcept> 15 #include <cassert> 16 17 #include "test_macros.h" 18 #include "min_allocator.h" 19 20 template <class S> 21 TEST_CONSTEXPR_CXX20 void 22 test(S s, const typename S::value_type* str, S expected) 23 { 24 s.assign(str); 25 LIBCPP_ASSERT(s.__invariants()); 26 assert(s == expected); 27 } 28 29 template <class S> 30 TEST_CONSTEXPR_CXX20 void test_string() { 31 test(S(), "", S()); 32 test(S(), "12345", S("12345")); 33 test(S(), "12345678901234567890", S("12345678901234567890")); 34 35 test(S("12345"), "", S()); 36 test(S("12345"), "12345", S("12345")); 37 test(S("12345"), "1234567890", S("1234567890")); 38 39 test(S("12345678901234567890"), "", S()); 40 test(S("12345678901234567890"), "12345", S("12345")); 41 test(S("12345678901234567890"), "12345678901234567890", 42 S("12345678901234567890")); 43 } 44 45 TEST_CONSTEXPR_CXX20 bool test() { 46 test_string<std::string>(); 47 #if TEST_STD_VER >= 11 48 test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char>>>(); 49 #endif 50 51 { // test assignment to self 52 typedef std::string S; 53 S s_short = "123/"; 54 S s_long = "Lorem ipsum dolor sit amet, consectetur/"; 55 56 s_short.assign(s_short.c_str()); 57 assert(s_short == "123/"); 58 s_short.assign(s_short.c_str() + 2); 59 assert(s_short == "3/"); 60 61 s_long.assign(s_long.c_str() + 30); 62 assert(s_long == "nsectetur/"); 63 } 64 65 return true; 66 } 67 68 int main(int, char**) 69 { 70 test(); 71 #if TEST_STD_VER > 17 72 static_assert(test()); 73 #endif 74 75 return 0; 76 } 77