libcxx/test/std/strings/basic.string/string.iterators/crbegin.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>
  10
  11 // const_reverse_iterator crbegin() const;
  12
  13 #include <string>
  14 #include <cassert>
  15
  16 #include "test_macros.h"
  17 #include "min_allocator.h"
  18
  19 template <class S>
  20 void
  21 test(const S& s)
  22 {
  23     typename S::const_reverse_iterator cb = s.crbegin();
  24     if (!s.empty())
  25     {
  26         assert(*cb == s.back());
  27     }
  28     assert(cb == s.rbegin());
  29 }
  30
  31 int main(int, char**)
  32 {
  33     {
  34     typedef std::string S;
  35     test(S());
  36     test(S("123"));
  37     }
  38 #if TEST_STD_VER >= 11
  39     {
  40     typedef std::basic_string<char, std::char_traits<char>, min_allocator<char>> S;
  41     test(S());
  42     test(S("123"));
  43     }
  44 #endif
  45
  46   return 0;
  47 }