libcxx/test/std/strings/basic.string/string.iterators/rbegin.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 //       reverse_iterator rbegin();
  12 // const_reverse_iterator rbegin() const;
  13
  14 #include <string>
  15 #include <cassert>
  16
  17 #include "test_macros.h"
  18 #include "min_allocator.h"
  19
  20 template <class S>
  21 void
  22 test(S s)
  23 {
  24     const S& cs = s;
  25     typename S::reverse_iterator b = s.rbegin();
  26     typename S::const_reverse_iterator cb = cs.rbegin();
  27     if (!s.empty())
  28     {
  29         assert(*b == s.back());
  30     }
  31     assert(b == cb);
  32 }
  33
  34 int main(int, char**)
  35 {
  36     {
  37     typedef std::string S;
  38     test(S());
  39     test(S("123"));
  40     }
  41 #if TEST_STD_VER >= 11
  42     {
  43     typedef std::basic_string<char, std::char_traits<char>, min_allocator<char>> S;
  44     test(S());
  45     test(S("123"));
  46     }
  47 #endif
  48
  49   return 0;
  50 }