Re: Variable Input on procedure - pass by value or pass by reference?

Discussion in 'VHDL' started by Tricky, Mar 19, 2009.

  1. Tricky

    Tricky Guest

    On 19 Mar, 15:58, Tricky <> wrote:
    > I have the following in my code:
    >
    > type img_2d_ptr is access image_grey_2D_t;
    > type image_array_t is array(natural range <>) of img_2d_ptr;
    > shared variable PIP_IMAGES  : image_array_t(PIP_REGISTERS'range) :=
    > read_PIP_images;
    >
    > procedure destroy_images( variable x : in image_array_t ) is
    > begin
    >   for i in x'range loop
    >     DEALLOCATE( x(i) );
    >   end loop;
    > end procedure destroy_images;
    >
    > The pass by reference/value is quite important here, because I need to
    > actually make sure the images are actually deallocated, and it doesnt
    > deallocate just a copy of them.
    >
    > Would it just be safer to ignore the input on the procedure and just
    > deallocate the PIP_IMAGES shared variable directly?


    Having just read that to myself, it must be pass by reference, else
    the DEALLOCATE procedure itself wouldnt work!
     
    Tricky, Mar 19, 2009
    #1
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