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
38 template <class S>
test_string()39 TEST_CONSTEXPR_CXX20 void test_string() {
40 test0("", S(""), S(""));
41 test0("", S("12345"), S("12345"));
42 test0("", S("1234567890"), S("1234567890"));
43 test0("", S("12345678901234567890"), S("12345678901234567890"));
44 test0("abcde", S(""), S("abcde"));
45 test0("abcde", S("12345"), S("abcde12345"));
46 test0("abcde", S("1234567890"), S("abcde1234567890"));
47 test0("abcde", S("12345678901234567890"), S("abcde12345678901234567890"));
48 test0("abcdefghij", S(""), S("abcdefghij"));
49 test0("abcdefghij", S("12345"), S("abcdefghij12345"));
50 test0("abcdefghij", S("1234567890"), S("abcdefghij1234567890"));
51 test0("abcdefghij", S("12345678901234567890"), S("abcdefghij12345678901234567890"));
52 test0("abcdefghijklmnopqrst", S(""), S("abcdefghijklmnopqrst"));
53 test0("abcdefghijklmnopqrst", S("12345"), S("abcdefghijklmnopqrst12345"));
54 test0("abcdefghijklmnopqrst", S("1234567890"), S("abcdefghijklmnopqrst1234567890"));
55 test0("abcdefghijklmnopqrst", S("12345678901234567890"), S("abcdefghijklmnopqrst12345678901234567890"));
56
57 #if TEST_STD_VER >= 11
58 test1("", S(""), S(""));
59 test1("", S("12345"), S("12345"));
60 test1("", S("1234567890"), S("1234567890"));
61 test1("", S("12345678901234567890"), S("12345678901234567890"));
62 test1("abcde", S(""), S("abcde"));
63 test1("abcde", S("12345"), S("abcde12345"));
64 test1("abcde", S("1234567890"), S("abcde1234567890"));
65 test1("abcde", S("12345678901234567890"), S("abcde12345678901234567890"));
66 test1("abcdefghij", S(""), S("abcdefghij"));
67 test1("abcdefghij", S("12345"), S("abcdefghij12345"));
68 test1("abcdefghij", S("1234567890"), S("abcdefghij1234567890"));
69 test1("abcdefghij", S("12345678901234567890"), S("abcdefghij12345678901234567890"));
70 test1("abcdefghijklmnopqrst", S(""), S("abcdefghijklmnopqrst"));
71 test1("abcdefghijklmnopqrst", S("12345"), S("abcdefghijklmnopqrst12345"));
72 test1("abcdefghijklmnopqrst", S("1234567890"), S("abcdefghijklmnopqrst1234567890"));
73 test1("abcdefghijklmnopqrst", S("12345678901234567890"), S("abcdefghijklmnopqrst12345678901234567890"));
74 #endif
75 }
76
test()77 TEST_CONSTEXPR_CXX20 bool test() {
78 test_string<std::string>();
79 #if TEST_STD_VER >= 11
80 test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char> > >();
81 #endif
82
83 return true;
84 }
85
main(int,char **)86 int main(int, char**) {
87 test();
88 #if TEST_STD_VER > 17
89 static_assert(test());
90 #endif
91
92 return 0;
93 }
94