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 test(S s, const typename S::value_type* str, S expected) { 22 s.assign(str); 23 LIBCPP_ASSERT(s.__invariants()); 24 assert(s == expected); 25 } 26 27 template <class S> 28 TEST_CONSTEXPR_CXX20 void test_string() { 29 test(S(), "", S()); 30 test(S(), "12345", S("12345")); 31 test(S(), "12345678901234567890", S("12345678901234567890")); 32 33 test(S("12345"), "", S()); 34 test(S("12345"), "12345", S("12345")); 35 test(S("12345"), "1234567890", S("1234567890")); 36 37 test(S("12345678901234567890"), "", S()); 38 test(S("12345678901234567890"), "12345", S("12345")); 39 test(S("12345678901234567890"), "12345678901234567890", S("12345678901234567890")); 40 41 // Starting from long string (no SSO) 42 test(S("1234512345678901234567890"), "", S()); 43 test(S("1234512345678901234567890"), "12345", S("12345")); 44 test(S("1234512345678901234567890"), "12345678901234567890", S("12345678901234567890")); 45 } 46 47 TEST_CONSTEXPR_CXX20 bool test() { 48 test_string<std::string>(); 49 #if TEST_STD_VER >= 11 50 test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char>>>(); 51 #endif 52 53 { // test assignment to self 54 typedef std::string S; 55 S s_short = "123/"; 56 S s_long = "Lorem ipsum dolor sit amet, consectetur/"; 57 58 s_short.assign(s_short.c_str()); 59 assert(s_short == "123/"); 60 s_short.assign(s_short.c_str() + 2); 61 assert(s_short == "3/"); 62 63 s_long.assign(s_long.c_str() + 30); 64 assert(s_long == "nsectetur/"); 65 } 66 67 return true; 68 } 69 70 int main(int, char**) { 71 test(); 72 #if TEST_STD_VER > 17 73 static_assert(test()); 74 #endif 75 76 return 0; 77 } 78