Re: [Boost-users] [Regex] How to use BOOST_REGEX_RECURSIVE

From: Richard Hadsell (hadsell_at_[hidden])
Date: 2008-05-20 10:17:52

John Maddock wrote:
> Richard Hadsell wrote:
>   
>> I just discovered the Regex algorithm selection macros that have been
>> around for a long time.  I noticed that BOOST_REGEX_RECURSIVE is
>> supposed to enable a faster algorithm, and it is not the default on
>> Linux systems.  Most of our patterns are very simple, so I am not
>> worried about pathological cases, and I would like to try the
>> recursive algorithm.
>>
>> Do I need to modify boost/regex/user.hpp before building the library?
>>     
>
> Yes.
>
>   
>> Do I need to compile my applications with the macro defined as a
>> compiler option?
>>     
>
> Not if you've changed user.hpp.
>
>   
>> Is it sufficient to define the macro in a source file before including
>> the boost/regex.h header?
>>     
>
> No the library has to built with the same options as you use in your 
> application.
>
> BTW the performance difference between the recursive and non-recursive 
> algorithms is actually quite small.
>
> HTH, John. 
>   
It does.  Thanks.

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