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 // append(basic_string_view<charT,traits> sv); // constexpr since C++20
13
14 #include <string>
15 #include <string_view>
16 #include <cassert>
17
18 #include "test_macros.h"
19 #include "min_allocator.h"
20
21 template <class S, class SV>
test(S s,SV sv,S expected)22 TEST_CONSTEXPR_CXX20 void test(S s, SV sv, S expected) {
23 s.append(sv);
24 LIBCPP_ASSERT(s.__invariants());
25 assert(s == expected);
26 }
27
28 template <class S>
test_string()29 TEST_CONSTEXPR_CXX20 void test_string() {
30 typedef std::string_view SV;
31 test(S(), SV(), S());
32 test(S(), SV("12345"), S("12345"));
33 test(S(), SV("1234567890"), S("1234567890"));
34 test(S(), SV("12345678901234567890"), S("12345678901234567890"));
35
36 test(S("12345"), SV(), S("12345"));
37 test(S("12345"), SV("12345"), S("1234512345"));
38 test(S("12345"), SV("1234567890"), S("123451234567890"));
39 test(S("12345"), SV("12345678901234567890"), S("1234512345678901234567890"));
40
41 test(S("1234567890"), SV(), S("1234567890"));
42 test(S("1234567890"), SV("12345"), S("123456789012345"));
43 test(S("1234567890"), SV("1234567890"), S("12345678901234567890"));
44 test(S("1234567890"), SV("12345678901234567890"), S("123456789012345678901234567890"));
45
46 test(S("12345678901234567890"), SV(), S("12345678901234567890"));
47 test(S("12345678901234567890"), SV("12345"), S("1234567890123456789012345"));
48 test(S("12345678901234567890"), SV("1234567890"), S("123456789012345678901234567890"));
49 test(S("12345678901234567890"), SV("12345678901234567890"), S("1234567890123456789012345678901234567890"));
50
51 // Starting from long string (no SSO)
52 test(S("123456789012345678901234567890"), SV(), S("123456789012345678901234567890"));
53 test(S("123456789012345678901234567890"), SV("12345"), S("12345678901234567890123456789012345"));
54 test(S("123456789012345678901234567890"), SV("1234567890"), S("1234567890123456789012345678901234567890"));
55 test(S("123456789012345678901234567890"),
56 SV("12345678901234567890"),
57 S("12345678901234567890123456789012345678901234567890"));
58 }
59
test()60 TEST_CONSTEXPR_CXX20 bool test() {
61 test_string<std::string>();
62 #if TEST_STD_VER >= 11
63 test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char>>>();
64 #endif
65
66 return true;
67 }
68
main(int,char **)69 int main(int, char**) {
70 test();
71 #if TEST_STD_VER > 17
72 static_assert(test());
73 #endif
74
75 return 0;
76 }
77