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//===----------------------------------------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
// <ostream>
// template <class charT, class traits = char_traits<charT> >
// class basic_ostream;
// basic_ostream& flush();
#include <ostream>
#include <cassert>
int sync_called = 0;
template <class CharT>
class testbuf
: public std::basic_streambuf<CharT>
{
public:
testbuf()
{
}
protected:
virtual int
sync()
{
if (sync_called++ == 1)
return -1;
return 0;
}
};
int main()
{
{
testbuf<char> sb;
std::ostream os(&sb);
os.flush();
assert(os.good());
assert(sync_called == 1);
os.flush();
assert(os.bad());
assert(sync_called == 2);
}
}
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