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>&
12 // assign(const charT* s, size_type n); // constexpr since C++20
13
14 #include <string>
15 #include <stdexcept>
16 #include <cassert>
17
18 #include "test_macros.h"
19 #include "min_allocator.h"
20
21 template <class S>
22 TEST_CONSTEXPR_CXX20 void
test(S s,const typename S::value_type * str,typename S::size_type n,S expected)23 test(S s, const typename S::value_type* str, typename S::size_type n, S expected)
24 {
25 s.assign(str, n);
26 LIBCPP_ASSERT(s.__invariants());
27 assert(s == expected);
28 }
29
test()30 TEST_CONSTEXPR_CXX20 bool test() {
31 {
32 typedef std::string S;
33 test(S(), "", 0, S());
34 test(S(), "12345", 3, S("123"));
35 test(S(), "12345", 4, S("1234"));
36 test(S(), "12345678901234567890", 0, S());
37 test(S(), "12345678901234567890", 1, S("1"));
38 test(S(), "12345678901234567890", 3, S("123"));
39 test(S(), "12345678901234567890", 20, S("12345678901234567890"));
40
41 test(S("12345"), "", 0, S());
42 test(S("12345"), "12345", 5, S("12345"));
43 test(S("12345"), "1234567890", 10, S("1234567890"));
44
45 test(S("12345678901234567890"), "", 0, S());
46 test(S("12345678901234567890"), "12345", 5, S("12345"));
47 test(S("12345678901234567890"), "12345678901234567890", 20,
48 S("12345678901234567890"));
49 }
50 #if TEST_STD_VER >= 11
51 {
52 typedef std::basic_string<char, std::char_traits<char>, min_allocator<char>> S;
53 test(S(), "", 0, S());
54 test(S(), "12345", 3, S("123"));
55 test(S(), "12345", 4, S("1234"));
56 test(S(), "12345678901234567890", 0, S());
57 test(S(), "12345678901234567890", 1, S("1"));
58 test(S(), "12345678901234567890", 3, S("123"));
59 test(S(), "12345678901234567890", 20, S("12345678901234567890"));
60
61 test(S("12345"), "", 0, S());
62 test(S("12345"), "12345", 5, S("12345"));
63 test(S("12345"), "1234567890", 10, S("1234567890"));
64
65 test(S("12345678901234567890"), "", 0, S());
66 test(S("12345678901234567890"), "12345", 5, S("12345"));
67 test(S("12345678901234567890"), "12345678901234567890", 20,
68 S("12345678901234567890"));
69 }
70 #endif
71 { // test assign to self
72 typedef std::string S;
73 S s_short = "123/";
74 S s_long = "Lorem ipsum dolor sit amet, consectetur/";
75
76 s_short.assign(s_short.data(), s_short.size());
77 assert(s_short == "123/");
78 s_short.assign(s_short.data() + 2, s_short.size() - 2);
79 assert(s_short == "3/");
80
81 s_long.assign(s_long.data(), s_long.size());
82 assert(s_long == "Lorem ipsum dolor sit amet, consectetur/");
83
84 s_long.assign(s_long.data() + 2, 8 );
85 assert(s_long == "rem ipsu");
86 }
87
88 return true;
89 }
90
main(int,char **)91 int main(int, char**)
92 {
93 test();
94 #if TEST_STD_VER > 17
95 static_assert(test());
96 #endif
97
98 return 0;
99 }
100