[gameprogrammer] Re: stl container

What i need is something like this:
<unique id, non unique id, data>
And the container should be able to return an iterator of all data for a certain non unique id. I have a hash map of entities, each one with its id, but I would also like to access a group of them located in the same place (map). Thats why I was thinking in some quick solution like that. 

Matthew Weigel escribió:

Roger D Vargas wrote:

Is there some stl strcture that let me store elements with multiple
keys, and one of those keys repeated?


You mean, something like a std::map but one key can correspond to
multiple values?  You might try doing this:

        std::map< key_type, std::list<value_type> >

I'm not sure what you mean by "multiple keys," but if you mean you want
multiple key types all mapping to the same set of data, you can simply
use multiple maps, and use pointers for the value_type (so accessing a
value_type object from any map will return a pointer to one object,
rather than a copy stored in each map).  You have to be careful, in that
case, to remove an object from all maps before calling delete on the
pointer.


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