iterator

[mickey]

I'd like to convert iterator to int without using map. is it possible?

vector<boj>::iterator ll;
//int i=1;
for (ll=boj.begin(); ll != boj.end(); ++ll) 
	printf("boj number  %i\n", 
        // i++ I'd like to avoid this way. I don't like

vector<boj>::iterator ll;
//int i=1;
for (ll=boj.begin(); ll != boj.end(); ++ll) 
	printf("boj number  %i\n", 
        // i++ I'd like to avoid this way. I don't like

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And why use '++ll' in for and not 'll++'? Thanks

[jacek]

why use '++ll' in for and not 'll++'? Thanks

ll++ is less effective, because it must create a copy of the iterator, increment the iterator and return that copy.

[wysota]

And for some iterators postfix ++ operator is not defined.

[mickey]

thanks a lot! But the first part of my post have answer? Thanks

[jacek]

But the first part of my post have answer?

Didn't you ask that question earlier?

[mickey]

It was similar...

int i = abs(obj.begin() - ll);

int i = abs(obj.begin() - ll);

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I hope this is good......

[mcosta]

It was similar...

int i = abs(obj.begin() - ll);

int i = abs(obj.begin() - ll);

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I hope this is good......

The correct way is

int i = distance(obj.begin(), ll);

int i = distance(obj.begin(), ll);

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