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#include "asan_testing.h"
20
21template <class S>
22TEST_CONSTEXPR_CXX20 void test(S s, const typename S::value_type* str, S expected) {
23 s.assign(str);
24 LIBCPP_ASSERT(s.__invariants());
25 assert(s == expected);
26 LIBCPP_ASSERT(is_string_asan_correct(s));
27}
28
29template <class S>
30TEST_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", S("12345678901234567890"));
42
43 // Starting from long string (no SSO)
44 test(S("1234512345678901234567890"), "", S());
45 test(S("1234512345678901234567890"), "12345", S("12345"));
46 test(S("1234512345678901234567890"), "12345678901234567890", S("12345678901234567890"));
47}
48
49TEST_CONSTEXPR_CXX20 bool test() {
50 test_string<std::string>();
51#if TEST_STD_VER >= 11
52 test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char>>>();
53 test_string<std::basic_string<char, std::char_traits<char>, safe_allocator<char>>>();
54#endif
55
56 { // test assignment to self
57 typedef std::string S;
58 S s_short = "123/";
59 S s_long = "Lorem ipsum dolor sit amet, consectetur/";
60
61 s_short.assign(s: s_short.c_str());
62 assert(s_short == "123/");
63 s_short.assign(s: s_short.c_str() + 2);
64 assert(s_short == "3/");
65
66 s_long.assign(s: s_long.c_str() + 30);
67 assert(s_long == "nsectetur/");
68 }
69
70 return true;
71}
72
73int main(int, char**) {
74 test();
75#if TEST_STD_VER > 17
76 static_assert(test());
77#endif
78
79 return 0;
80}
81

source code of libcxx/test/std/strings/basic.string/string.modifiers/string_assign/pointer.pass.cpp