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    <p>Here is the class I created that seems to do the job, thanks to all who helped out!</p> <p>-William</p> <pre><code>class TeeStream : public std::basic_filebuf&lt;char, std::char_traits&lt;char&gt; &gt; { private: class FileStream : public std::ofstream { public: FileStream() : logFileName("/my/log/file/location.log") { open(logFileName.c_str(), ios::out | ios::trunc); if (fail()) { cerr &lt;&lt; "Error: failed to open log file: " &lt;&lt; logFileName &lt;&lt; endl; exit(1); } } ~FileStream() { close(); } const char *getLogFileName() const { return logFileName.c_str(); } private: const string logFileName; }; public: typedef std::char_traits&lt;char&gt; traits; typedef std::basic_filebuf&lt;char, traits&gt; baseClass; TeeStream() : baseClass(), _logOutputStream(), _clogBuf(clog.rdbuf()), _fileBuf(_logOutputStream.rdbuf()) { clog.rdbuf(this); _logOutputStream &lt;&lt; "Log file starts here:" &lt;&lt; endl; } ~TeeStream() { clog.rdbuf(_clogBuf); } int_type overflow(char_type additionalChar =traits::eof()) { const int_type eof = traits::eof(); const char_type additionalCharacter = traits::to_char_type(additionalChar); const int_type result1 = _clogBuf-&gt;sputc(additionalCharacter); const int_type result2 = _fileBuf-&gt;sputc(additionalCharacter); if (traits::eq_int_type(eof, result1)) { return eof; } else { return result2; } } int sync() { const int result1 = _clogBuf-&gt;pubsync(); const int result2 = _fileBuf-&gt;pubsync(); if (result1 == -1) { return -1; } else { return result2; } } private: FileStream _logOutputStream; streambuf * const _clogBuf; streambuf * const _fileBuf; }; </code></pre>
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    1. POHow to redefine clog to tee to original clog and a log file?
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    1. USWilliamKF
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    1. COWhile the general idea seems ok, you have some potential problems. `putc` expects a char_type, while you're passing a `int_type`, there is a `traits::to_char_type()` function for these conversions (and do appropriate checks to see if the conversion succeeded)
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      1. USPieter
    2. COSecondly, it's probably better to use the traits compare functions i.s.o. relying on `operator==` for comparing the internal int_type: `traits::eq_int_type(additionalChar, traits::eof())` (although this is fairly academic, in reality it won't make a difference most of the times)
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    3. COMade changes suggested by Pieter.
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