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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Could you point at an example for #2?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> Manuel Klimek [mailto:klimek@google.com]
<br>
<b>Sent:</b> Monday, March 04, 2013 1:59 PM<br>
<b>To:</b> Vane, Edwin; clang-dev Developers<br>
<b>Subject:</b> Re: Thoughts on subexpression matching<o:p></o:p></span></p>
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<p class="MsoNormal">+cfe-dev<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">On Mon, Mar 4, 2013 at 6:09 PM, Vane, Edwin <<a href="mailto:edwin.vane@intel.com" target="_blank">edwin.vane@intel.com</a>> wrote:<o:p></o:p></p>
<p class="MsoNormal">Hi Manuel,<br>
<br>
I've seen a need for subexpression matching arise several times in working with matchers. Often it comes in the form of: match this expression of this "thing over here" is the same as "that thing over there". In the use-auto transform for example, the only
thing that's not in a matcher is the test that the vardecl type is the same as the initializer. Have you had any thoughts about this feature before?<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">There are two ways to do this:<o:p></o:p></p>
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<p class="MsoNormal">1. be able to express references in the matcher language; this is hard, but if somebody wanted to give it a go, I'd be excited ;)<o:p></o:p></p>
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<p class="MsoNormal">2. just do a submatch in the callback - that's what match() on the ASTMatchFinder and the freestanding match() functions around the ASTMatchFinder are for; this is what we're currently using - thanks to the caching of the parent map in
the ASTContext this is now also computationally acceptable :)<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Cheers,<o:p></o:p></p>
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<p class="MsoNormal">/Manuel<o:p></o:p></p>
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