Iterators

This is a discussion on Iterators within the C++ Programming forums, part of the General Programming Boards category; Can anyone explain what an iterator is??...

  1. #1
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    Question Iterators

    Can anyone explain what an iterator is??

  2. #2
    (?<!re)tired Mario F.'s Avatar
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  3. #3
    Ethernal Noob
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    There are also input stream iterators that make filling/displaying containers much easier.

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    the word iterator is almost synonymous with the word placeholder. That is, an iterator is used to store a position of an element. (either in a container or a stream)

    You may be familiar with the way that a pointer can be used as a 'placeholder' for an element in an array; an iterator is really just a neatly packaged abstraction of that concept. (with built in range checking, so its safer too)

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    >> with built in range checking, so its safer too
    The concept of an iterator does not include range checking, and most STL iterators also do not include built-in range checking.

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    Quote Originally Posted by Daved
    >> with built in range checking, so its safer too
    The concept of an iterator does not include range checking, and most STL iterators also do not include built-in range checking.
    ah ok, my bad. I was under the impression that STL iterators would throw an out of range exception if you went beyond the container limits. then again, perhaps that's not really range checking

  7. #7
    The superhaterodyne twomers's Avatar
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    I think the .at() function with strings does that, out of range checking I mean. Not sure about whether vectors have that ...

  8. #8
    Cat without Hat CornedBee's Avatar
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    Vectors have at(), and it throws.

    No iterator I've ever seen throws. They might assert(), but they do not throw.
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    Smile thanks

    thanks for the help. I got it.

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