C++ link2005 error 错误 解决方法汇总（一般重复定义，如果都是不就是 函数定义和实现没有分离）

 1 //class connection
 2  class Connection
 3 {
 4  public:
 5     Connection(){
 6  /////
 7      }
 8 
 9     ~Connection(){
10  /////
11      }
12 
13     //make connect-socket
14      bool makeConnect(const string &host, const string &service, const string &protocal);
15     bool makeConnect(){
16         return makeConnect(host, service, protocal_type);
17     }
18     //make passive-socket
19      bool makePassive(const string &service, const string &transport, const int qlen);
20     bool makePassive(){
21         return makePassive(service, protocal_type, qlen);
22     }
23 
24     //get protocal
25      string getProtocal(){ return protocal_type; }
26 
27     //get socket type
28      SOCKET_TYPE getSocketType(){ return sock_type; }
29 
30     //get socket
31     SOCKET getSocket(){    return sock; }
32 
33     string getHost(){ return host; }
34     string getService(){ return service; }
35     string getPort(){ return service; }
36     int getQueueLength(){ return qlen; }
37 
38 protected:
39 
40 private:
41     SOCKET passivesock(const string &service, const string &transport, const int qlen);
42     SOCKET connectsock(const string &host, const string &service, const string &transport );
43 
44 private:
45     SOCKET sock;
46     SOCKET_TYPE sock_type;
47     string protocal_type;
48     string host;
49     string service;
50     int qlen;
51     u_short    portbase;
52 };
53 
54 SOCKET Connection::passivesock(const string &serv, const string &tp, const int qlen)
55 {
56 ////
57 }
58 
59 SOCKET Connection::connectsock(const string &h, const string &serv, const string &tp)
60 {
61 //////
62 }
63 bool Connection::makePassive(const string &service, const string &transport, const int qlen){
64 //////
65 }
66 
67 bool Connection::makeConnect(const string &host, const string &service, const string &protocal){
68 ///////
69 }