Re: [Boost-users] [spirit][qi] on_error handler

Subject: Re: [Boost-users] [spirit][qi] on_error handler
From: Diederick C. Niehorster (dcnieho_at_[hidden])
Date: 2012-12-21 23:13:45

Hi Joel,

Ah yes, somehow missed those.
Thanks!

Best,
Dee

On Sat, Dec 22, 2012 at 9:03 AM, Joel de Guzman <djowel_at_[hidden]> wrote:
> On 12/22/12 8:44 AM, Diederick C. Niehorster wrote:
>>
>> Hi All,
>>
>> I have struggled through getting a parser set up with qi, but in the
>> end it all worked out. Its really a nice library once you get the hang
>> of it a bit!
>> I have one leftover question. I now have an inline function with
>> phoenix for the error handler as per the example, but as i'm using it
>> multiple times, i would like to make its own function that i can
>> reuse. I have tried a function object, wrapped in a phoenix function
>> or not, but never got it to work (either got number of argument
>> mismatches or errors that const-volatile qualifiers were being
>> dropped).
>>
>> So basically, how would i rewrite the below into a free function
>> (object/etc)?
>>
>> qi::on_error<qi::fail>
>> (
>>         stimSpecVec // rule name
>>         , std::cout // the function
>>             << phoenix::val("Error! Expecting \"")
>>             << qi::_4                                           // what
>> failed?
>>             << phoenix::val("\", but got: \"")
>>             << phoenix::construct<std::string>(qi::_3, qi::_2)  //
>> iterators
>> to error-pos, end
>>             << phoenix::val("\"")
>>             << std::endl
>> );
>
>
> Taka a look at the compiler_tutorial examples. The error handlers use
> function
> objects there. You will see lots of examples.
>
> Regards,
> --
> Joel de Guzman
> http://www.boostpro.com
> http://boost-spirit.com
>
>
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