As I&#39;m sure is common I write code that builds under several versions of Boost<br>which often results in code like...<br><br>#if (BOOST_VERSION &lt; 103400)<br>do this<br>#else<br>do that<br>#endif<br><br>This is specifically true for changes to Boost.Filesystem, but also in other places.<br>
Usually the difference being addressed is obvious, but not always, and in any<br>case direct use of &quot;103400&quot; seems to be like a magic number to me.<br><br>So, I&#39;d like to do something like this in a global header (in one place for many versions<br>
and capabilities)<br><br>#if (BOOST_VERSION &lt; 103400)<br>#define BOOST_PRE_FILESYSTEM_RATIONALISATION<br>#endif<br><br>and then say<br><br>#ifdef BOOST_PRE_FILESYSTEM_RATIONALISATION<br>do this<br>#else<br>do that<br>#endif<br>
<br>Is this unwise for any reason I&#39;m not seeing, and are the tokens I&#39;m defining already<br>defined somewhere, so I can use those instead?<br><br>Thx<br><br>- Rob.<br>