62 lines
1.9 KiB
C
62 lines
1.9 KiB
C
#pragma once
|
|
|
|
// example of how the heap can be used
|
|
// here, each node value points to a plain int, but can substitute with other types
|
|
//
|
|
// // define a comparison function, a > b returns -1, a == b returns 0, a < b returns 1
|
|
// int compare_nodes(dlos_ComparableNode *a, dlos_ComparableNode *b) {
|
|
// int left = *((int*) a->value);
|
|
// int right = *((int*) b->value);
|
|
// if (left > right) {
|
|
// return -1;
|
|
// } else if (left == right) {
|
|
// return 0;
|
|
// } else {
|
|
// return 1;
|
|
// }
|
|
// }
|
|
//
|
|
// int main(int argc, char *argv[]) {
|
|
// int test_size = 10;
|
|
// int data_storage[] = {73, 6, 57, 88, 60, 42, 83, 72, 48, 85};
|
|
//
|
|
// // define an array of dlos_ComparableNode and fill it with the desired data
|
|
// // note: if using heap memory, just use for array, keep dlos_Heap in stack memory
|
|
// dlos_ComparableNode a[test_size];
|
|
// for (int i = 0; i < test_size; i++) {
|
|
// a[i].value = &data_storage[i];
|
|
// }
|
|
// // then define the dlos_Heap with the above array, compare function, and sizes
|
|
// dlos_Heap heap = {
|
|
// .size = test_size,
|
|
// .arr = a,
|
|
// .arr_size = test_size,
|
|
// .compare = compare_nodes
|
|
// };
|
|
//
|
|
// // then can use the heap; for example: order data into a max heap and sort it
|
|
// dlos_max_heap(&heap);
|
|
// dlos_sort_heap(&heap);
|
|
// for (int i = 0; i < test_size; i++) {
|
|
// if (i == 0) printf("sorted: ");
|
|
// printf("%d, ", *((int*) heap.arr[i].value));
|
|
// if (i == test_size - 1) printf("\n");
|
|
// }
|
|
// return 0;
|
|
// }
|
|
|
|
typedef struct dlos_ComparableNode {
|
|
void *value;
|
|
} dlos_ComparableNode;
|
|
|
|
typedef struct dlos_Heap {
|
|
int size;
|
|
dlos_ComparableNode *arr;
|
|
int arr_size;
|
|
int (*compare)(dlos_ComparableNode *a, dlos_ComparableNode *b);
|
|
} dlos_Heap;
|
|
|
|
void dlos_node_swap(dlos_ComparableNode *arr, int a, int b);
|
|
void dlos_sift_down(int i, dlos_Heap *h);
|
|
void dlos_max_heap(dlos_Heap *h);
|