News Group wrote:

...

All,

I am trying to copy from a boost::cmatch variable to a std::set. It compiles fine but when I run it I get a:

Debug Assertion Failure xtree 245 map/set iterator not dereferencable

I think it's the "match.begin()" and "match.end()" in std::copy that is failing. This is a short version of what I have:

#include <boost/regex.hpp> #include <algorithm> #include <string> #include <set>

bool Parse( const std::string &page, std::set< std::string > &links ) { const boost::regex expression( "123" ); boost::cmatch match;

if( boost::regex_search( page.c_str(), match, expression ) ) { std::copy( match.begin(), match.end(), links.begin() ); return true; }

return false; }

int main() { std::string test_data = "www.abc123.com/index.php"; std::set< std::string > links;

Parse( test_data, links ); return EXIT_SUCCESS; }

You are using std::set incorrectly: you can't just copy stuff into it like that, we can't even use std::back_inserter here because std::set doesn't have a push_back member :-( There's another issue here as well: regex_search locates the *first* occurence of the regex within the string, if you want to find them all then you'll need a regex_iterator. Remember that match_results contains a collection of *sub-expression* matches for *one match*. So off the top of my head, how about: bool Parse( const std::string &page, std::set< std::string > &links ) { const boost::regex expression( "123" ); // Enumerate occurances of sub-expression 0 (the whole match): boost::sregex_token_iterator i(page.begin(), page.end(), expression), j; while(i != j) { links.insert((*i++).str()); } return links.size() != 0; } HTH, John.