How to get lenght of a float* variable
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  1. #1
    Join Date
    Jan 2010
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    6

    How to get lenght of a float* variable

    Hi, I have a variable like this:

    float* ranges = someClass->getRanges()

    and I would like to know how to get the lenght of "ranges" because "someClass" doesn't has any method to obtain this.

    Could you help me, please?

    Thank you!

  2. #2
    GCDEF is offline Elite Member Power Poster
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    Nov 2003
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    11,987

    Re: How to get lenght of a float* variable

    Your question doesn't make sense to me. Does getRanges return a pointer to an array? If it does, you can't get the length of the array from a pointer. Typically you'd use output parameters when more than one return value is needed.

  3. #3
    Lindley is offline Elite Member Power Poster
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    Re: How to get lenght of a float* variable

    There is no way to query the length of a raw array once it has decayed to a pointer (or if it was dynamically allocated to begin with). You need to either a) make the length an explicitly queryable value, or b) use a class which wraps the array and stores the length internally. std::vector and std::tr1::array are two such classes that are commonly used.

  4. #4
    Join Date
    Jan 2010
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    6

    Re: How to get lenght of a float* variable

    Ok, i will try to modify "someClass" adding a new attribute numberOfRanges

    thank you!

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