解除对不完整类型abstract-data-type的指针

时间:2015-04-16 17:47:09

标签: c pointers abstract-data-type

我有以下代码部分:

dictionary.h

#ifndef _DICTIONARY_H
#define _DICTIONARY_H

typedef struct _dict_t dict_t;
typedef dict_t *Dictionary;

Dictionary dict_new(void);
(...)

dictionary.c

#include "dictionary.h"
struct _dict_t {
    unsigned int size;
    char **data;
};

Dictionary dict_new(void){
    Dictionary dict = NULL;
    dict = calloc(1, sizeof(struct _dict_t));
    dict->data = calloc(1, sizeof(char));
    dict->size = 0;
    return (dict);
}

的main.c

#include "dictionary.h"
Dictionary main_dict; // global dictionary
Dictionary ignored;   // Yes, i know its horrible

int is_known(char *word){
    int i;
    for (i = 0; i < main_dict->size; ++i)  {
        if (strcmp(main_dict->data[i], word) == 0)
            return 1;
    }

    for (i = 0; i < ignored->size; ++i){
        if (strcmp(ignored->data[i], word) == 0)
            return 1;
    }
    return 0;
}

int main(){
    (...)
}

许多错误之一(取消引用指向不完整类型的指针)在这里:

main_dict->size

我找不到错误。发生了什么事?

1 个答案:

答案 0 :(得分:0)

当类型不完整时,编译器不知道该类型的实例内部是什么。在取消引用之前,您需要提供类型的定义。