error: request for member ‘table’ in something not a structure or union C

Question

所以我收到了这个错误。我知道错误告诉我我实际上并没有指向结构，但我似乎无法弄清楚原因。这是我的代码。

 typedef struct {
   char * word;
   char * defn;
 } entry;


 typedef struct {
   int size;
   struct entry **table;
 } hashTable;

 typedef hashTable * Dictionary;

 Dictionary create(int initial_capacity, int delta_capacity){
     Dictionary *new_table;
     int i;

     if ((new_table = malloc(sizeof(Dictionary))) == NULL){
         return NULL;
     }

     if ((new_table->table = malloc(sizeof(entry *) * initial_capacity)) == NULL){
         return NULL;
     }

     for(i=0; i < initial_capacity; i++){
         new_table->table[i] = NULL;
     }
     return new_table;
 }

这是我遇到的两个编译器错误。

 hashP.c: In function ‘create’:
 hashP.c:15:16: error: request for member ‘table’ in something not a structure or union
   if ((new_table->table = malloc(sizeof(entry *) * initial_capacity)) == NULL){

 hashP.c:20:12: error: request for member ‘table’ in something not a structure or union
    new_table->table[i] = NULL;

有人有什么想法吗？

Answer 1

typedef hashTable * Dictionary;

通过将指针隐藏在 typedef 后面，您设法欺骗自己，让自己不理解自己的代码。因为 Dictionary *new_table 实际上是一个 struct hashTable** 而不是你想要的

永远不要将指针隐藏在 typedef 后面，所有问题都会消失。

error: request for member ‘table’ in something not a structure or union C

error: request for member ‘table’ in something not a structure or union C

c

pointers

hashtable