I've never heard of hash_map so I enetered that term in Google's search box and the result indicates several references from reputable sources. I suggest you do the same and follow up as needed. In summary it appears as though map and hash_map are not the same but hash_map is an STL container and can be used in C++ and as such in Dev C++. I didn't bother looking for a tutorial, but if there's one available, you'll probably find it by looking at the Google listings.