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 // 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>
  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>
  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
  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 }