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Asked: 2026-05-10T16:45:49+00:00

I’m trying to learn C++ so forgive me if this question demonstrates a lack

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I’m trying to learn C++ so forgive me if this question demonstrates a lack of basic knowledge, you see, the fact is, I have a lack of basic knowledge.

I want some help working out how to create an iterator for a class I have created.

I have a class ‘Shape’ which has a container of Points. I have a class ‘Piece’ which references a Shape and defines a position for the Shape. Piece does not have a Shape it just references a Shape.

I want it to seem like Piece is a container of Points which are the same as those of the Shape it references but with the offset of the Piece’s position added.

I want to be able to iterate through the Piece’s Points just as if Piece was a container itself. I’ve done a little reading around and haven’t found anything which has helped me. I would be very grateful for any pointers.

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  1. You should use Boost.Iterators. It contains a number of templates and concepts to implement new iterators and adapters for existing iterators. I have written an article about this very topic; it’s in the December 2008 ACCU magazine. It discusses an (IMO) elegant solution for exactly your problem: exposing member collections from an object, using Boost.Iterators.

    If you want to use the stl only, the Josuttis book has a chapter on implementing your own STL iterators.

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