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    <p>One thing you can do is if you do not otherwise need the <code>vformat()</code> function, move its implementation into the <code>format()</code> function (untested):</p> <pre><code>#include &lt;stdarg.h&gt; #include &lt;string.h&gt; #include &lt;assert.h&gt; #include &lt;string&gt; #include &lt;vector&gt; std::string format(const char *fmt, ...) { va_list ap; enum {size = 1024}; // if you want a buffer on the stack for the 99% of the time case // for efficiency or whatever), I suggest something like // STLSoft's auto_buffer&lt;&gt; template. // // http://www.synesis.com.au/software/stlsoft/doc-1.9/classstlsoft_1_1auto__buffer.html // std::vector&lt;char&gt; buf( size); // // where you get a proper vsnprintf() for MSVC is another problem // maybe look at http://www.jhweiss.de/software/snprintf.html // // note that vsnprintf() might use the passed ap with the // va_arg() macro. This would invalidate ap here, so we // we va_end() it here, and have to redo the va_start() // if we want to use it again. From the C standard: // // The object ap may be passed as an argument to // another function; if that function invokes the // va_arg macro with parameter ap, the value of ap // in the calling function is indeterminate and // shall be passed to the va_end macro prior to // any further reference to ap. // // Thanks to Rob Kennedy for pointing that out. // va_start (ap, fmt); int needed = vsnprintf (&amp;buf[0], buf.size(), fmt, ap); va_end( ap); if (needed &gt;= size) { // vsnprintf reported that it wanted to write more characters // than we allotted. So do a malloc of the right size and try again. // This doesn't happen very often if we chose our initial size // well. buf.resize( needed + 1); va_start (ap, fmt); needed = vsnprintf (&amp;buf[0], buf.size(), fmt, ap); va_end( ap); assert( needed &lt; buf.size()); } return std::string( &amp;buf[0]); } </code></pre>
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    1. POva_copy -- porting to visual C++?
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    1. COYou'd have to call va_end and va_start again before the second call to vsnprintf, wouldn't you?
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      1. USRob Kennedy
    2. COHmm - looks like you're right. I never realized that before. -- Fixed (I think).
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    3. CO@Zenikoder: `auto_buffer<>` isn't part of the STL.
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