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 // size_type find(charT c, size_type pos = 0) const; // constexpr since C++20
12
13 #include <string>
14 #include <cassert>
15
16 #include "test_macros.h"
17 #include "min_allocator.h"
18
19 template <class S>
20 TEST_CONSTEXPR_CXX20 void
test(const S & s,typename S::value_type c,typename S::size_type pos,typename S::size_type x)21 test(const S& s, typename S::value_type c, typename S::size_type pos, typename S::size_type x) {
22 LIBCPP_ASSERT_NOEXCEPT(s.find(c, pos));
23 assert(s.find(c, pos) == x);
24 if (x != S::npos)
25 assert(pos <= x && x + 1 <= s.size());
26 }
27
28 template <class S>
test(const S & s,typename S::value_type c,typename S::size_type x)29 TEST_CONSTEXPR_CXX20 void test(const S& s, typename S::value_type c, typename S::size_type x) {
30 LIBCPP_ASSERT_NOEXCEPT(s.find(c));
31 assert(s.find(c) == x);
32 if (x != S::npos)
33 assert(0 <= x && x + 1 <= s.size());
34 }
35
36 template <class S>
test_string()37 TEST_CONSTEXPR_CXX20 void test_string() {
38 test(S(""), 'c', 0, S::npos);
39 test(S(""), 'c', 1, S::npos);
40 test(S("abcde"), 'c', 0, 2);
41 test(S("abcde"), 'c', 1, 2);
42 test(S("abcde"), 'c', 2, 2);
43 test(S("abcde"), 'c', 4, S::npos);
44 test(S("abcde"), 'c', 5, S::npos);
45 test(S("abcde"), 'c', 6, S::npos);
46 test(S("abcdeabcde"), 'c', 0, 2);
47 test(S("abcdeabcde"), 'c', 1, 2);
48 test(S("abcdeabcde"), 'c', 5, 7);
49 test(S("abcdeabcde"), 'c', 9, S::npos);
50 test(S("abcdeabcde"), 'c', 10, S::npos);
51 test(S("abcdeabcde"), 'c', 11, S::npos);
52 test(S("abcdeabcdeabcdeabcde"), 'c', 0, 2);
53 test(S("abcdeabcdeabcdeabcde"), 'c', 1, 2);
54 test(S("abcdeabcdeabcdeabcde"), 'c', 10, 12);
55 test(S("abcdeabcdeabcdeabcde"), 'c', 19, S::npos);
56 test(S("abcdeabcdeabcdeabcde"), 'c', 20, S::npos);
57 test(S("abcdeabcdeabcdeabcde"), 'c', 21, S::npos);
58
59 test(S(""), 'c', S::npos);
60 test(S("abcde"), 'c', 2);
61 test(S("abcdeabcde"), 'c', 2);
62 test(S("abcdeabcdeabcdeabcde"), 'c', 2);
63 }
64
test()65 TEST_CONSTEXPR_CXX20 bool test() {
66 test_string<std::string>();
67 #if TEST_STD_VER >= 11
68 test_string<std::basic_string<char, std::char_traits<char>, min_allocator<char> > >();
69 #endif
70
71 return true;
72 }
73
main(int,char **)74 int main(int, char**) {
75 test();
76 #if TEST_STD_VER > 17
77 static_assert(test());
78 #endif
79
80 return 0;
81 }
82