From: dick.bridges@tais.com [mailto:dick.bridges@tais.com] Sent: Friday, April 11, 2003 11:54 AM
This is probably more of a C++ than an boost question but, since it involves shared_ptr, I thought I'd try it here first. I've got a vector of shared_ptrS (e.g., vector<shared_ptr<T> > v;) and I need to find the entry given the 'real' pointer to the underlying T. Looping thru the vector like this:
<snippet> for( vector<shared_ptr<T>::iterator itr = v.begin(); itr != v.end(); itr++) { if( itr->get() == real_this){...} } </snippet>
works but seems klunky. I should be able to use [find_if( v.begin(), v.end (), ???)] but I can't work out the predicate. Any help or "pointers" ;) will be greatly appreciated.
Here's how I like to do it, though my co-workers sometimes complain: #include "boost/shared_ptr.hpp" #include "boost/bind.hpp" #include <vector> #include <iostream> int main() { typedef std::vector<boost::shared_ptr<int> > V; V vec; int* foo = new int; vec.push_back(boost::shared_ptr<int>(foo)); V::iterator iter = std::find_if(vec.begin(), vec.end(), boost::bind(std::equal_to<int*>(), boost::bind(&boost::shared_ptr<int>::get, _1), foo)); if(iter != vec.end()) std::cout << "Life is good" << std::endl; //don't delete foo!!! return 0; } Tom ----------------------------------------------------------------------- DISCLAIMER: Information contained in this message and/or attachment(s) may contain confidential information of Zetec, Inc. If you have received this transmission in error, please notify the sender by return email. -----------------------------------------------------------------------