Accessing Portion(s) of STL Container

[Mike Copeland]

Is there a way to access a "chunk" (or portion) of an STL map? That
is, I have a map declared, and it will normally contain more than, say,
25 objects. I want to display 25 objects at a time, e.g. 1-25, 26-50,
etc. Of course, I don't expect to have multiples of 25 to work with, so
I want to know when the what's in the last "page" of display data.
Please advise. TIA

 

[Ian Collins]

Is there a way to access a "chunk" (or portion) of an STL map? That
is, I have a map declared, and it will normally contain more than, say,
25 objects. I want to display 25 objects at a time, e.g. 1-25, 26-50,
etc. Of course, I don't expect to have multiples of 25 to work with, so
I want to know when the what's in the last "page" of display data.

Unlike say a vector, the order of element in a map is dynamic and the
storage isn't contiguous, so you can't really do what you are asking.

 

[Mike Copeland]

Is there a way to access a "chunk" (or portion) of an STL map? That

As long as you are not adding to, or removing from the map, you could
simply iterate through it 25 elements at a time.

That's the case with my data, but _how_ do I access, say, objects 26-
50 without "picking" that range as I iterate through the entire data
set?

 

[Ian Collins]

That's the case with my data, but _how_ do I access, say, objects 26-
50 without "picking" that range as I iterate through the entire data
set?

As I said in my other reply, you can't.

 

[RaZiel]

That's the case with my data, but _how_ do I access, say, objects 26-
50 without "picking" that range as I iterate through the entire data
set?

You could use a second map, mapping position to key value in the first map.