vector resizing

This is a discussion on vector resizing within the C++ Programming forums, part of the General Programming Boards category; Okay, thanks....

  1. #16
    Frequently Quite Prolix dwks's Avatar
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    Okay, thanks.
    dwk

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  2. #17
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    Quote Originally Posted by dwks
    Yes, but my vector isn't resizing at all. I get a segmentation fault!
    This:
    Code:
    v[x]
    calls the operator[]() function. Like an array, a vector indexes its elements, and if the index doesn't exist then the operator[]() function fails.

    Vectors grow automatically in size when you add elements to the vector. There are several functions defined to allow you to add elements to a vector. However, operator[]() does not add elements to the vector--it tries to access elements that already exist. In a map<>, operator[]() does add elements to the map, but it doesn't work the same way with a vector.

    If you want to add elements to a vector, then you have to use functions that do that.

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