libcxx/test/std/iterators/stream.iterators/ostreambuf.iterator/ostreambuf.iter.ops/failed.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 // <iterator>
  10
  11 // class ostreambuf_iterator
  12
  13 // bool failed() const throw();
  14
  15 #include <cassert>
  16 #include <iterator>
  17 #include <sstream>
  18
  19 #include "test_macros.h"
  20
  21 template <typename Char, typename Traits = std::char_traits<Char> >
  22 struct my_streambuf : public std::basic_streambuf<Char,Traits> {
  23     typedef typename std::basic_streambuf<Char,Traits>::int_type  int_type;
  24     typedef typename std::basic_streambuf<Char,Traits>::char_type char_type;
  25
  26     my_streambuf() {}
  27     int_type sputc(char_type) { return Traits::eof(); }
  28 };
  29
  30 int main(int, char**)
  31 {
  32     {
  33         my_streambuf<char> buf;
  34         std::ostreambuf_iterator<char> i(&buf);
  35         i = 'a';
  36         assert(i.failed());
  37     }
  38 #ifndef TEST_HAS_NO_WIDE_CHARACTERS
  39     {
  40         my_streambuf<wchar_t> buf;
  41         std::ostreambuf_iterator<wchar_t> i(&buf);
  42         i = L'a';
  43         assert(i.failed());
  44     }
  45 #endif
  46
  47   return 0;
  48 }