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Iterator to reverse_iterator?

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Started by DeadXorAlive April 20, 2006 02:16 PM

4 comments, last by DeadXorAlive 17 years, 12 months ago

DeadXorAlive

535

Author

April 20, 2006 02:16 PM

From the stl, is it possible to get a reverse_iterator from a regular iterator? Couldn't find anything mentioning this, I would guess not but I'm not sure.

Conner McCloud

1,135

April 20, 2006 02:25 PM

Quote:Original post by DeadXorAlive
From the stl, is it possible to get a reverse_iterator from a regular iterator? Couldn't find anything mentioning this, I would guess not but I'm not sure.

Reverse iterators have an explicit conversion from regular iterators. The semantics are defined as follows:

&*(reverse_iterator(i)) == &*(i - 1).

Fruny

1,658

April 20, 2006 02:28 PM

int main(){	std::vector<int> v;	std::vector<int>::iterator e = v.end();	std::vector<int>::reverse_iterator f(e);}

"Debugging is twice as hard as writing the code in the first place. Therefore, if you write the code as cleverly as possible, you are, by definition, not smart enough to debug it." — Brian W. Kernighan

DeadXorAlive

535

Author

April 20, 2006 02:35 PM

Ah thanks a bunch, that's simple. Is the reverse also possible? Thank you. I'm still trying to grok iterator_traits and all that, there's much more goodness to it all than I thought.

Fruny

1,658

April 20, 2006 02:37 PM

e = f.base();

DeadXorAlive

535

Author

April 20, 2006 02:42 PM

Fruny thanks. This stuff makes me happy. [smile]
I'll stop spamming the forum now.

Iterator to reverse_iterator?

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