Thread: C99, constant pointer to array of unspecified bound issue

  1. #1
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    C99, constant pointer to array of unspecified bound issue

    I have question that is specific to C99 standard. The following declaration compiles without problem:

    void func(int (*const arr)[]);

    However, this declaration triggers error message "missing array size" (using Pelles C compiler):

    void func(int arr[const][]); /* actually this declaration should be identical to previous one */

    Does standard say something about this specific case?

    Also, I wonder, whether "static const exp" is allowed in brackets without at least one type qualifier, e.g.:

    void func(int arr[const static 10]); /* this is allowed */

    void func(int arr[static 10]); /* what about this? */

    Thanks

  2. #2
    and the hat of int overfl Salem's Avatar
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    > void func(int arr[const][]); /* actually this declaration should be identical to previous one */
    Well it isn't, because you have const inside the square brackets.

    > void func(int (*const arr)[]);
    Which if you substitute array notation leads back to
    void func(int const arr[][]);

    Since you must specify the size of all minor dimensions, you end up with the pelles compiler warning of "missing array size"

    So try
    void func(int (*const arr)[10]);
    void func(int const arr[][10]);



    > void func(int arr[const static 10]); /* this is allowed */
    > void func(int arr[static 10]); /* what about this? */
    A literal constant of 10 is both those things to begin with, so nothing is gained, even if it were valid.
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.

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