[Boost-users] [string_algo] Split and Predicates

From: David Brownell (david_brownell_at_[hidden])
Date: 2005-01-27 18:38:04

I am attempting to split a string with the string_algo library, using the
code below.  It appears that the split algorithm is designed to split on
instances of individual characters rather than sequences of characters.  Is
there something I can do to split on a substring?  The code below
illustrates the problem, where I am forces to use the is_any_of predicate
rather than something that implies equality.  It seems like this is a
trivial use of the algorithm, so there could easily be something that I am
missing.  

    typedef std::vector<boost::iterator_range<char const *> >
ResultsType;

    ResultsType             results;
    static char const       STRING[] = "this\r\nis\r\n\r\na test!";

    boost::split(results, 
                 boost::iterator_range<char const *>(STRING, STRING +
sizeof(STRING)), 
                 boost::is_any_of("\r\n"));  // The problem is here.  I
would like to be able 
                                             // to use something like
equals, but split requires 
                                             // a predicate that takes a
single argument rather than 
                                             // a range.

    for(ResultsType::const_iterator rptr = results.begin(); 
        rptr != results.end(); 
        ++rptr)
            std::cout << "'" << std::string(rptr->begin(), rptr->end()) <<
"'\n";

Thanks!
David Brownell