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