test/std/input.output/iostream.format/output.streams/ostream_sentry/destruct.pass.cpp

   1 //===----------------------------------------------------------------------===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is dual licensed under the MIT and the University of Illinois Open
   6 // Source Licenses. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9
  10 // <ostream>
  11
  12 // template <class charT, class traits = char_traits<charT> >
  13 // class basic_ostream::sentry;
  14
  15 // ~sentry();
  16
  17 #include <ostream>
  18 #include <cassert>
  19
  20 #include "test_macros.h"
  21
  22 int sync_called = 0;
  23
  24 template <class CharT>
  25 struct testbuf1
  26     : public std::basic_streambuf<CharT>
  27 {
  28     testbuf1() {}
  29
  30 protected:
  31
  32     int virtual sync()
  33     {
  34         ++sync_called;
  35         return 1;
  36     }
  37 };
  38
  39 int main()
  40 {
  41     {
  42         std::ostream os((std::streambuf*)0);
  43         std::ostream::sentry s(os);
  44         assert(!bool(s));
  45     }
  46     assert(sync_called == 0);
  47     {
  48         testbuf1<char> sb;
  49         std::ostream os(&sb);
  50         std::ostream::sentry s(os);
  51         assert(bool(s));
  52     }
  53     assert(sync_called == 0);
  54     {
  55         testbuf1<char> sb;
  56         std::ostream os(&sb);
  57         std::ostream::sentry s(os);
  58         assert(bool(s));
  59         unitbuf(os);
  60     }
  61     assert(sync_called == 1);
  62 #ifndef TEST_HAS_NO_EXCEPTIONS
  63     {
  64         testbuf1<char> sb;
  65         std::ostream os(&sb);
  66         try
  67         {
  68             std::ostream::sentry s(os);
  69             assert(bool(s));
  70             unitbuf(os);
  71             throw 1;
  72         }
  73         catch (...)
  74         {
  75         }
  76         assert(sync_called == 1);
  77     }
  78 #endif
  79 }