libstdc++-v3/doc/html/manual/bk01pt03pr01.html

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   4   Extensions
   5
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   7   Here we will make an attempt at describing the non-Standard extensions to
   8   the library.  Some of these are from SGI's STL, some of these are GNU's,
   9   and some just seemed to appear on the doorstep.
  10 </p><p><span class="emphasis"><em>Before</em></span> you leap in and use any of these
  11 extensions, be aware of two things:
  12 </p><div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem"><p>
  13      Non-Standard means exactly that.
  14      </p><p>
  15        The behavior, and the very
  16        existence, of these extensions may change with little or no
  17        warning.  (Ideally, the really good ones will appear in the next
  18        revision of C++.)  Also, other platforms, other compilers, other
  19        versions of g++ or libstdc++ may not recognize these names, or
  20        treat them differently, or...
  21      </p></li><li class="listitem"><p>
  22        You should know how to access these headers properly.
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  24   Extensions
  25
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