Johan Torp wrote:
Is there any way to use boost::shared_ptrs as keys in associative containers and perform look up using raw pointers?
What I want is something similar to this:
std::map<boost::shared_ptr<int>, std::string> m; int i; m.find(&i); _______________________________________________
Here's one possibility: struct raw_less { bool operator()(const shared_ptr<int> &lhs, const shared_ptr<int> &rhs) { return lhs.get() < rhs.get(); } }; std::map<boost::shared_ptr<int>, std::string, raw_less> m; Now m will search using raw pointers. If you really want to, you could do something like int i; m.find(boost_shared_ptr<int>(&i, null_deleter()); where null_deleter is a class with an operator() that takes a pointer and does nothing. However, this will be fairly useless because if i is not owned by a shared_ptr you will never find it inside the map. Joe Gottman