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 // UNSUPPORTED: !stdlib=libc++ && (c++03 || c++11 || c++14)
10
11 // <string_view>
12 // constexpr size_type rfind(charT c, size_type pos = npos) const;
13
14 #include <string_view>
15 #include <cassert>
16
17 #include "test_macros.h"
18 #include "constexpr_char_traits.h"
19
20 template <class S>
test(const S & s,typename S::value_type c,typename S::size_type pos,typename S::size_type x)21 void test(const S& s, typename S::value_type c, typename S::size_type pos, typename S::size_type x) {
22 LIBCPP_ASSERT_NOEXCEPT(s.rfind(c, pos));
23 assert(s.rfind(c, pos) == x);
24 if (x != S::npos)
25 assert(x <= pos && 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 void test(const S& s, typename S::value_type c, typename S::size_type x) {
30 LIBCPP_ASSERT_NOEXCEPT(s.rfind(c));
31 assert(s.rfind(c) == x);
32 if (x != S::npos)
33 assert(x + 1 <= s.size());
34 }
35
main(int,char **)36 int main(int, char**) {
37 {
38 typedef std::string_view S;
39 test(S(""), 'b', 0, S::npos);
40 test(S(""), 'b', 1, S::npos);
41 test(S("abcde"), 'b', 0, S::npos);
42 test(S("abcde"), 'b', 1, 1);
43 test(S("abcde"), 'b', 2, 1);
44 test(S("abcde"), 'b', 4, 1);
45 test(S("abcde"), 'b', 5, 1);
46 test(S("abcde"), 'b', 6, 1);
47 test(S("abcdeabcde"), 'b', 0, S::npos);
48 test(S("abcdeabcde"), 'b', 1, 1);
49 test(S("abcdeabcde"), 'b', 5, 1);
50 test(S("abcdeabcde"), 'b', 9, 6);
51 test(S("abcdeabcde"), 'b', 10, 6);
52 test(S("abcdeabcde"), 'b', 11, 6);
53 test(S("abcdeabcdeabcdeabcde"), 'b', 0, S::npos);
54 test(S("abcdeabcdeabcdeabcde"), 'b', 1, 1);
55 test(S("abcdeabcdeabcdeabcde"), 'b', 10, 6);
56 test(S("abcdeabcdeabcdeabcde"), 'b', 19, 16);
57 test(S("abcdeabcdeabcdeabcde"), 'b', 20, 16);
58 test(S("abcdeabcdeabcdeabcde"), 'b', 21, 16);
59
60 test(S(""), 'b', S::npos);
61 test(S("abcde"), 'b', 1);
62 test(S("abcdeabcde"), 'b', 6);
63 test(S("abcdeabcdeabcdeabcde"), 'b', 16);
64 }
65
66 #if TEST_STD_VER > 11
67 {
68 typedef std::basic_string_view<char, constexpr_char_traits<char>> SV;
69 constexpr SV sv1;
70 constexpr SV sv2{"abcde", 5};
71
72 static_assert(sv1.rfind('b', 0) == SV::npos, "");
73 static_assert(sv1.rfind('b', 1) == SV::npos, "");
74 static_assert(sv2.rfind('b', 0) == SV::npos, "");
75 static_assert(sv2.rfind('b', 1) == 1, "");
76 static_assert(sv2.rfind('b', 2) == 1, "");
77 static_assert(sv2.rfind('b', 3) == 1, "");
78 static_assert(sv2.rfind('b', 4) == 1, "");
79 }
80 #endif
81
82 return 0;
83 }
84