Exchange pointers

This is a discussion on Exchange pointers within the C Programming forums, part of the General Programming Boards category; Hi!! I have a type queue_t, its a head of a linked list. Then I have these variables: queue_t *exe_thr_list[15]; ...

  1. #1
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    Exchange pointers

    Hi!!

    I have a type queue_t, its a head of a linked list. Then I have these variables:

    queue_t *exe_thr_list[15];
    queue_t *expired_thr_list[15];

    They are arrays of 15 elements, where each element is a pointer to queue_t (Pretty obvious).

    So far so good. Now I want to make a function to swich them. What I mean is:

    what ever exe_thr_list points to must (after the function is called) point to whaever expired_thr_list points to. And vice versa. In other words to swich the two arrays.

    I made this obviously wrong code:
    Code:
    queue_t *tmp_queue[15];
    tmp_queue = exe_thr_list;
    exe_thr_list = expired_thr_list;
    expired_thr_list = tmp_queue;
    Wrong because I can't compile it with gcc, getting the following error:

    error: incompatible types in assignment

    in the last three lines of code.

    Can someone point me to the light (LOOOL)??

  2. #2
    spurious conceit MK27's Avatar
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    Quote Originally Posted by Lasering View Post
    Can someone point me to the light (LOOOL)??
    With an array you must do this:
    Code:
    for (i=0; i<15; i++) ray_two[i] = ray_one[i];
    Make sense?
    C programming resources:
    GNU C Function and Macro Index -- glibc reference manual
    The C Book -- nice online learner guide
    Current ISO draft standard
    CCAN -- new CPAN like open source library repository
    3 (different) GNU debugger tutorials: #1 -- #2 -- #3
    cpwiki -- our wiki on sourceforge

  3. #3
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    Actually not. Because its like take you are putting the values of array one in array two, but now putting the values os array two in one.

    Anyway I think I can resolve my problem with that code.

    Thks a lot!!.

  4. #4
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    This is the fastest 180 degree turn yet seen, on the forum!

    Those are *some* tires you have there Lasering.

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