[Boost-users] Filter_iterator and boost::any follow-up

From: Stephen Gross (sgross_at_[hidden])
Date: 2005-09-13 11:47:22

>I think you'll need to use something like:
>for(filter_itr f(i.begin(), i.end()); f != filter_itr(i.end()); ++f)

Ok, cool, I've got it working on a vector of ints.

My next question is this: I've got a vector of boost::any's, and I want to 
iterate across only the boost::any's representing int's. For example:

=== CODE ===

template<typename T> struct isT {
  bool operator() (const boost::any & a) const {  return a.type() == 
typeid(T); } };

int main()
{
  std::vector<boost::any> av;

  av.push_back(1);
  av.push_back(std::string("hello"));
  av.push_back(2);

  typedef boost::filter_iterator<isT<int>, std::vector<boost::any>::iterator 
 > int_itr;

  for(int_itr itr(av.begin()); itr != int_itr(av.end()); ++itr) ;
}
=========

Unfortunately, the above code seg faults when executed. I imagine I've 
probably constructed my filter_iterator incorrectly somehow. Any ideas?

Thanks,
--Steve

Stephen Gross
Case Western School of Medicine
Cleveland, OH

"By Grabthar's hammer, by the sons of Worvan, you shall be avenged." - Dr. 
Lazarus