[Boost-users] [xpressive] crash again :(

From: Ovanes Markarian (om_boost_at_[hidden])
Date: 2007-10-18 14:22:51

Hello Eric,

sorry for bothering. I use xpressive in the following context:

    typedef x::sregex            regex_type;

    const regex_type non_semicolon    = ~x::as_xpr(';');
    const regex_type sem_separated    = *non_semicolon;

    typedef boost::iterator_range<x::sregex_token_iterator>
regex_tokens;
    typedef ::std::vector<regex_tokens>
regex_transformed_collection;

    inline regex_tokens apply_regex(regex_type const& re, std::string const&
item)
    {
        typedef x::sregex_token_iterator    sre_iter;
        return boost::make_iterator_range(sre_iter(item.begin(), item.end(),
re), sre_iter());
    }

// usage:
            std::vector<std::string> v; //vector is filled with strings of
type: some_part;some_other_part

            typedef regex_transformed_coll::const_iterator re_citer;

            regex_transformed_collection        sep_strings;
            ::std::transform
                (
                    v.begin(), v.end(), ::std::back_inserter(sep_strings)
                ,    ::std::tr1::bind(&apply_regex, sem_separated,
tr1::placeholders::_1)
                );

            //v is in the same scope and valid
            for(re_citer curr=sep_strings.begin(), end=sep_strings.end();
curr!=end; ++curr)
            {
                regex_tokens const& toks = *curr;
                std::string source    = toks.front(); //this line is fine
and returns me the first part of a string...
                // all subsequent line will raise an assertion
                std::string includes    = *++toks.begin();
                size_t sz = toks.size();
            }

Is there smth. I did not take in account? This code crashes in:
regex_token_iterator.hpp:
regex_token_iterator<BidiIter> &operator ++()
    {
->>HERE>>        this->fork_(); // un-share the implementation

And is caused by regex_token_iterator_impl ctor.

I know this code is not very efficient, since it iterates through the
collection of strings twice instead of doing smth. within one run, but it is
just an example.

Many thanks,
Ovanes