libcxx/test/std/strings/string.view/string.view.find/rfind_char_size.pass.cpp

   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_view>
  10 // constexpr size_type rfind(charT c, size_type pos = npos) const;
  11
  12 #include <string_view>
  13 #include <cassert>
  14
  15 #include "test_macros.h"
  16 #include "constexpr_char_traits.h"
  17
  18 template <class S>
  19 void
  20 test(const S& s, typename S::value_type c, typename S::size_type pos,
  21      typename S::size_type x)
  22 {
  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>
  29 void
  30 test(const S& s, typename S::value_type c, typename S::size_type x)
  31 {
  32     assert(s.rfind(c) == x);
  33     if (x != S::npos)
  34         assert(x + 1 <= s.size());
  35 }
  36
  37 int main(int, char**)
  38 {
  39     {
  40     typedef std::string_view S;
  41     test(S(""), 'b', 0, S::npos);
  42     test(S(""), 'b', 1, S::npos);
  43     test(S("abcde"), 'b', 0, S::npos);
  44     test(S("abcde"), 'b', 1, 1);
  45     test(S("abcde"), 'b', 2, 1);
  46     test(S("abcde"), 'b', 4, 1);
  47     test(S("abcde"), 'b', 5, 1);
  48     test(S("abcde"), 'b', 6, 1);
  49     test(S("abcdeabcde"), 'b', 0, S::npos);
  50     test(S("abcdeabcde"), 'b', 1, 1);
  51     test(S("abcdeabcde"), 'b', 5, 1);
  52     test(S("abcdeabcde"), 'b', 9, 6);
  53     test(S("abcdeabcde"), 'b', 10, 6);
  54     test(S("abcdeabcde"), 'b', 11, 6);
  55     test(S("abcdeabcdeabcdeabcde"), 'b', 0, S::npos);
  56     test(S("abcdeabcdeabcdeabcde"), 'b', 1, 1);
  57     test(S("abcdeabcdeabcdeabcde"), 'b', 10, 6);
  58     test(S("abcdeabcdeabcdeabcde"), 'b', 19, 16);
  59     test(S("abcdeabcdeabcdeabcde"), 'b', 20, 16);
  60     test(S("abcdeabcdeabcdeabcde"), 'b', 21, 16);
  61
  62     test(S(""), 'b', S::npos);
  63     test(S("abcde"), 'b', 1);
  64     test(S("abcdeabcde"), 'b', 6);
  65     test(S("abcdeabcdeabcdeabcde"), 'b', 16);
  66     }
  67
  68 #if TEST_STD_VER > 11
  69     {
  70     typedef std::basic_string_view<char, constexpr_char_traits<char>> SV;
  71     constexpr SV  sv1;
  72     constexpr SV  sv2 { "abcde", 5 };
  73
  74     static_assert (sv1.rfind( 'b', 0 ) == SV::npos, "" );
  75     static_assert (sv1.rfind( 'b', 1 ) == SV::npos, "" );
  76     static_assert (sv2.rfind( 'b', 0 ) == SV::npos, "" );
  77     static_assert (sv2.rfind( 'b', 1 ) == 1, "" );
  78     static_assert (sv2.rfind( 'b', 2 ) == 1, "" );
  79     static_assert (sv2.rfind( 'b', 3 ) == 1, "" );
  80     static_assert (sv2.rfind( 'b', 4 ) == 1, "" );
  81     }
  82 #endif
  83
  84   return 0;
  85 }