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[QUOTE="Victor Bazarov, post: 3404914"]
There is no "bottom one" to speak of.  What does the pointer
point to?  Without knowing that, it's impossible to tell you
the difference in memory usage, performance, or anything else.

Same story.  You don't explain where the pointer comes from, how
can we tell the difference?

You should offer what the users want.  Ask the users.  Since
you should synchronize the 'maps' it would be preferred to add
both 'A' and 'B' at the same time.  Whether the users are going
to want to create a 'C' object from a pre-defined 'std::map',
I am not sure.  Isn't the fact that you store those in a map
a simple implementation detail?  It shouldn't dictate the user
interface to your class, you know.

That seems preferable.

The users might also have arrays of 'double', 'A', and 'B', from
which they might want you to create your 'C' object.  Consider
offering

C::C(size_t N, double* keys, const A* v1, const B* v2);

and tell them to make sure those arrays should better have at
least N elements.  Then create your map in a loop, for example.

V
[/QUOTE]

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