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I have a map<EntityState, boost::weak_ptr<Animation>> in my EntityRepresentation class. I would kinda want to create a Builder class for the representation, but I have to consider the costs of copying the map.
EntityState is cheap to copy since it's just a collection of static functions; boost::weak_ptr is also cheap to copy. How about the map as a whole?
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Yes -- when you insert an item into an std::map, you pass it by value, so what it contains is a copy of what you passed.
Don't optimize prematurely. In many scenarios the run-time performance of a builder class will not be the bottleneck.
Generally, the complexity of copying a map is O(n). From the comments, it looks like n is small. If you've identified that you really need to optimize, then in such a case, using two vectors will be cheaper both in accessing the items, and in the copying.
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