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);
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);
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>
27 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>
33 void test1(const typename S::value_type* lhs, S&& rhs, const S& x) {
34   assert(lhs + move(rhs) == x);
35 }
36 #endif
37 
38 int main() {
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