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 // template<class charT, class traits, class Allocator>
12 // basic_string<charT,traits,Allocator>
13 // operator+(const charT* lhs, const basic_string<charT,traits,Allocator>& rhs); // constexpr since C++20
14
15 // template<class charT, class traits, class Allocator>
16 // basic_string<charT,traits,Allocator>&&
17 // operator+(const charT* lhs, basic_string<charT,traits,Allocator>&& rhs); // constexpr since C++20
18
19 #include <string>
20 #include <utility>
21 #include <cassert>
22
23 #include "test_macros.h"
24 #include "min_allocator.h"
25
26 template <class S>
test0(const typename S::value_type * lhs,const S & rhs,const S & x)27 TEST_CONSTEXPR_CXX20 void test0(const typename S::value_type* lhs, const S& rhs, const S& x) {
28 assert(lhs + rhs == x);
29 }
30
31 #if TEST_STD_VER >= 11
32 template <class S>
test1(const typename S::value_type * lhs,S && rhs,const S & x)33 TEST_CONSTEXPR_CXX20 void test1(const typename S::value_type* lhs, S&& rhs, const S& x) {
34 assert(lhs + std::move(rhs) == x);
35 }
36 #endif
37
test()38 TEST_CONSTEXPR_CXX20 bool test() {
39 {
40 typedef std::string S;
41 test0("", S(""), S(""));
42 test0("", S("12345"), S("12345"));
43 test0("", S("1234567890"), S("1234567890"));
44 test0("", S("12345678901234567890"), S("12345678901234567890"));
45 test0("abcde", S(""), S("abcde"));
46 test0("abcde", S("12345"), S("abcde12345"));
47 test0("abcde", S("1234567890"), S("abcde1234567890"));
48 test0("abcde", S("12345678901234567890"), S("abcde12345678901234567890"));
49 test0("abcdefghij", S(""), S("abcdefghij"));
50 test0("abcdefghij", S("12345"), S("abcdefghij12345"));
51 test0("abcdefghij", S("1234567890"), S("abcdefghij1234567890"));
52 test0("abcdefghij", S("12345678901234567890"),
53 S("abcdefghij12345678901234567890"));
54 test0("abcdefghijklmnopqrst", S(""), S("abcdefghijklmnopqrst"));
55 test0("abcdefghijklmnopqrst", S("12345"), S("abcdefghijklmnopqrst12345"));
56 test0("abcdefghijklmnopqrst", S("1234567890"),
57 S("abcdefghijklmnopqrst1234567890"));
58 test0("abcdefghijklmnopqrst", S("12345678901234567890"),
59 S("abcdefghijklmnopqrst12345678901234567890"));
60 }
61
62 #if TEST_STD_VER >= 11
63 {
64 typedef std::string S;
65 test1("", S(""), S(""));
66 test1("", S("12345"), S("12345"));
67 test1("", S("1234567890"), S("1234567890"));
68 test1("", S("12345678901234567890"), S("12345678901234567890"));
69 test1("abcde", S(""), S("abcde"));
70 test1("abcde", S("12345"), S("abcde12345"));
71 test1("abcde", S("1234567890"), S("abcde1234567890"));
72 test1("abcde", S("12345678901234567890"), S("abcde12345678901234567890"));
73 test1("abcdefghij", S(""), S("abcdefghij"));
74 test1("abcdefghij", S("12345"), S("abcdefghij12345"));
75 test1("abcdefghij", S("1234567890"), S("abcdefghij1234567890"));
76 test1("abcdefghij", S("12345678901234567890"),
77 S("abcdefghij12345678901234567890"));
78 test1("abcdefghijklmnopqrst", S(""), S("abcdefghijklmnopqrst"));
79 test1("abcdefghijklmnopqrst", S("12345"), S("abcdefghijklmnopqrst12345"));
80 test1("abcdefghijklmnopqrst", S("1234567890"),
81 S("abcdefghijklmnopqrst1234567890"));
82 test1("abcdefghijklmnopqrst", S("12345678901234567890"),
83 S("abcdefghijklmnopqrst12345678901234567890"));
84 }
85 {
86 typedef std::basic_string<char, std::char_traits<char>,
87 min_allocator<char> >
88 S;
89 test0("", S(""), S(""));
90 test0("", S("12345"), S("12345"));
91 test0("", S("1234567890"), S("1234567890"));
92 test0("", S("12345678901234567890"), S("12345678901234567890"));
93 test0("abcde", S(""), S("abcde"));
94 test0("abcde", S("12345"), S("abcde12345"));
95 test0("abcde", S("1234567890"), S("abcde1234567890"));
96 test0("abcde", S("12345678901234567890"), S("abcde12345678901234567890"));
97 test0("abcdefghij", S(""), S("abcdefghij"));
98 test0("abcdefghij", S("12345"), S("abcdefghij12345"));
99 test0("abcdefghij", S("1234567890"), S("abcdefghij1234567890"));
100 test0("abcdefghij", S("12345678901234567890"),
101 S("abcdefghij12345678901234567890"));
102 test0("abcdefghijklmnopqrst", S(""), S("abcdefghijklmnopqrst"));
103 test0("abcdefghijklmnopqrst", S("12345"), S("abcdefghijklmnopqrst12345"));
104 test0("abcdefghijklmnopqrst", S("1234567890"),
105 S("abcdefghijklmnopqrst1234567890"));
106 test0("abcdefghijklmnopqrst", S("12345678901234567890"),
107 S("abcdefghijklmnopqrst12345678901234567890"));
108
109 test1("", S(""), S(""));
110 test1("", S("12345"), S("12345"));
111 test1("", S("1234567890"), S("1234567890"));
112 test1("", S("12345678901234567890"), S("12345678901234567890"));
113 test1("abcde", S(""), S("abcde"));
114 test1("abcde", S("12345"), S("abcde12345"));
115 test1("abcde", S("1234567890"), S("abcde1234567890"));
116 test1("abcde", S("12345678901234567890"), S("abcde12345678901234567890"));
117 test1("abcdefghij", S(""), S("abcdefghij"));
118 test1("abcdefghij", S("12345"), S("abcdefghij12345"));
119 test1("abcdefghij", S("1234567890"), S("abcdefghij1234567890"));
120 test1("abcdefghij", S("12345678901234567890"),
121 S("abcdefghij12345678901234567890"));
122 test1("abcdefghijklmnopqrst", S(""), S("abcdefghijklmnopqrst"));
123 test1("abcdefghijklmnopqrst", S("12345"), S("abcdefghijklmnopqrst12345"));
124 test1("abcdefghijklmnopqrst", S("1234567890"),
125 S("abcdefghijklmnopqrst1234567890"));
126 test1("abcdefghijklmnopqrst", S("12345678901234567890"),
127 S("abcdefghijklmnopqrst12345678901234567890"));
128 }
129 #endif
130
131 return true;
132 }
133
main(int,char **)134 int main(int, char**) {
135 test();
136 #if TEST_STD_VER > 17
137 static_assert(test());
138 #endif
139
140 return 0;
141 }
142