雙鏈表
1、頭文件
#ifndef lcthw_List_h
#define lcthw_List_h
#include <stdlib.h>
struct ListNode;
typedef struct ListNode {
struct ListNode *next;
struct ListNode *prev;
void *value;
} ListNode;
typedef struct List {
int count;
ListNode *first;
ListNode *last;
} List;
List *List_create();
void List_destroy(List *list);
void List_clear(List *list);
void List_clear_destroy(List *list);
#define List_count(A) ((A)->count)
#define List_first(A) ((A)->first != NULL ? (A)->first->value : NULL)
#define List_last(A) ((A)->last != NULL ? (A)->last->value : NULL)
void List_push(List *list, void *value);
void *List_pop(List *list);
void List_unshift(List *list, void *value);
void *List_shift(List *list);
void *List_remove(List *list, ListNode *node);
#define LIST_FOREACH(L, S, M, V) ListNode *_node = NULL;\
ListNode *V = NULL;\
for(V = _node = L->S; _node != NULL; V = _node = _node->M)
#endif
2、實現代碼
#include <lcthw/list.h> #include <lcthw/dbg.h> List *List_create() { return calloc(1, sizeof(List)); } void List_destroy(List *list) { LIST_FOREACH(list, first, next, cur) { if(cur->prev) { free(cur->prev); } } free(list->last); free(list); } void List_clear(List *list) { LIST_FOREACH(list, first, next, cur) { free(cur->value); } } void List_clear_destroy(List *list) { List_clear(list); List_destroy(list); } void List_push(List *list, void *value) { ListNode *node = calloc(1, sizeof(ListNode)); check_mem(node); node->value = value; if(list->last == NULL) { list->first = node; list->last = node; } else { list->last->next = node; node->prev = list->last; list->last = node; } list->count++; error: return; } void *List_pop(List *list) { ListNode *node = list->last; return node != NULL ? List_remove(list, node) : NULL; } void List_unshift(List *list, void *value) { ListNode *node = calloc(1, sizeof(ListNode)); check_mem(node); node->value = value; if(list->first == NULL) { list->first = node; list->last = node; } else { node->next = list->first; list->first->prev = node; list->first = node; } list->count++; error: return; } void *List_shift(List *list) { ListNode *node = list->first; return node != NULL ? List_remove(list, node) : NULL; } void *List_remove(List *list, ListNode *node) { void *result = NULL; check(list->first && list->last, "List is empty."); check(node, "node can't be NULL"); if(node == list->first && node == list->last) { list->first = NULL; list->last = NULL; } else if(node == list->first) { list->first = node->next; check(list->first != NULL, "Invalid list, somehow got a first that is NULL."); list->first->prev = NULL; } else if (node == list->last) { list->last = node->prev; check(list->last != NULL, "Invalid list, somehow got a next that is NULL."); list->last->next = NULL; } else { ListNode *after = node->next; ListNode *before = node->prev; after->prev = before; before->next = after; } list->count--; result = node->value; free(node); error: return result; }
一個雙鏈表的實現,把各種功能實現全了還真是不容易