我有这个问题，看不到错误在哪里，所以我希望有人可以帮助解决它。我从编译源代码得到的错误是：
client.c:15:54: error: invalid application of ‘sizeof’ to incomplete type ‘struct client’
我在头文件-client.h中有结构定义：
#ifndef PW_CLIENT
#define PW_CLIENT
#include <event2/listener.h>
#include <event2/bufferevent.h>
#include <event2/buffer.h>
#include <arpa/inet.h>
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
struct client {
int id;
struct bufferevent *bev;
struct client *prev;
struct client *next;
};
struct client *client_head = NULL;
struct client* client_connect(struct bufferevent *bev);
#endif
这是client.c的来源：
#include <event2/listener.h>
#include <event2/bufferevent.h>
#include <event2/buffer.h>
#include <arpa/inet.h>
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
struct client* client_connect(struct bufferevent *bev) {
// Client info
struct client *c = (struct client*)malloc(sizeof(struct client));
if (c == NULL) {
// error allocating memory
} else {
if (client_head == NULL) {
// initialize list addresses
c->prev = c->next = NULL;
// set connection id
c->id = 0;
} else {
// set list addresses
client_head->next = c;
c->prev = client_head;
c->next = NULL;
client_head = c;
// set connection id
c->id = (c->prev->id + 1);
}
// initialize user vars
c->bev = bev;
}
return c;
}
谢谢！