Thread: Hash tables / hash maps

  1. #1
    Registered User
    Join Date
    Oct 2008

    Hash tables / hash maps

    Hi I am having trouble wrapping my head around on how to empty my buckets.

    struct hashLink {
    	KeyT key; /*the key is what you use to look up a hashLink*/
    	ValueT value; /*the value stored with the hashLink, an int*/
    	struct hashLink * next; /* linked list nodes*/
    typedef struct hashLink hashLink;
    struct hashMap {
        hashLink ** table; /*array of pointers to hashLinks*/
        int tableSize; /* number of buckets in table*/
        int count; /*number of hashLinks in table*/
    /* Other functions to insert, remove, the initialize the hash, etc. */
    int cleanBuckets(struct hashMap *hasht) {
         /* what I'm trying to do here is return the amount of empty or clean buckets in the table, where the buckets have no links */
    Thanks in advance.

  2. #2
    spurious conceit MK27's Avatar
    Join Date
    Jul 2008
    segmentation fault
    Quote Originally Posted by dlwlsdn View Post
    Hi I am having trouble wrapping my head around on how to empty my buckets.
    What's wrong with just iterating thru the array? What are the buckets -- linked lists?
    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
    Registered User
    Join Date
    Oct 2008
    Nevermind, I got it

    Thanks for responding though. Seems like coffee can do the trick sometimes lol.

  4. #4
    Registered User
    Join Date
    Sep 2006
    I'm not surprised that you found the answer - most folk do:

    1) Grasp the top rim of the bucket, with one hand.

    2) With the other hand supporting the bottom rim, lift and invert the bucket.

    Brilliant advice, given away for free - what a forum!

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