null stl iterator ?

[Gianni Mariani]

I need to create an object that contains an iterator. The iterator may
or may not be valid in which case I would also need to store a flag
indicating that the iterator is invalid.

Am I missing somthing ?

This object is created way before a container is created so setting it
to end() or somthing does not make sense.

 

[Moonlit]

Hi,

Why not set variables for beginiing end one past end of array.. These var
will be returned by end() and begin().

Then when you assign an array make the 'end' var equal to one past the end
of the array and the other 'begin' var to begining of the array.

Regards, Ron AF Greve

 

[Ron Natalie]

This object is created way before a container is created so setting it
to end() or somthing does not make sense.

Then you will need to have an external flag, or create a container specifically
so you can use it's end() (even if you never put anything in it).

The standard provides no "default" value for iterators.

 

[Moonlit]

Hi,

Forgot to say, initially these variables should be set to zero.

Regards, Ron.

 

[Ron Natalie]

Hi,

Forgot to say, initially these variables should be set to zero.

If these "variables" are iterators, then there's no guarantee you can
assign (even a constant) zero to them.