Re: [boost] [xpressive] Performance Tuning?

Subject: Re: [boost] [xpressive] Performance Tuning?
From: Stewart, Robert (Robert.Stewart_at_[hidden])
Date: 2009-07-01 15:39:06

Eric Niebler wrote:
> Stewart, Robert wrote:
> > Dave Jenkins wrote:
> >>>> Each call to parse() is constructing the sregex variables.
[snip]
> >> How about making them static const?  That should be thread safe.
>
> You can still make the regex objects static const and use
> placeholders in the semantic actions. See the following
> section:
>
> http://www.boost.org/doc/libs/1_39_0/doc/html/xpressive/user_s_guide.html#boost_xpressive.user_s_guide.semantic_actions_and_user_defined_assertions.referring_to_non_local_variables

I forgot about that section.  Thanks for the pointer.

Whoa!  The performance just shot up to a mere 6X the custom code (from 175X).  That might well be fast enough to keep the Xpressive version because of its readability!

Thanks Eric!

_____
Rob Stewart                           robert.stewart_at_[hidden]
Software Engineer, Core Software      using std::disclaimer;
Susquehanna International Group, LLP  http://www.sig.com

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