Re: [Boost-users] [Spirit][Date_Time] Parsing of boost date_time (segfault)

Subject: Re: [Boost-users] [Spirit][Date_Time] Parsing of boost date_time (segfault)
From: Agustín K-ballo Bergé (kaballo86_at_[hidden])
Date: 2011-05-03 02:20:40

On 03/05/2011 2:55, Vitaly Budovski wrote:
>          boost::uint16_t year;
>          boost::uint8_t month;
>          boost::uint8_t day;
>
>          boost::uint8_t hour;
>          boost::uint8_t minute;
>          boost::uint8_t second;
>
>          date =
>              (
>                  big_word[ref(year) = _1]>>  byte_[ref(month) = _1]>>
>                      byte_[ref(day) = _1]>>  eps[_val =
>                      construct<boost::gregorian::date>(cref(year), cref(month),
>                      cref(day))]
>              )
>          ;

You are passing references to local objects. Whenever the actual parsing 
happens, which it's not during grammar construction, the referred 
objects do not longer exist.

You should declare those objects as class members, or even better use 
Phoenix's locals; and I'm pretty sure that there is a way to do what you 
want with no temporaries. The attribute of

big_word[ref(year) = _1]>>  byte_[ref(month) = _1]>>
                     byte_[ref(day) = _1]

should be something like tuple< uint16_t, uint8_t, uint8_t >, which one 
would be able to use to construct a gregorian date. I'm not fluent in 
Spirit, so I hope one of the experts out there comes up with an example 
on how to do this.

Agustín Bergé.-
http://talesofcpp.blogspot.com