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