Undefined Reference

Hej

Jeg har lavet min egen SOCKETKLASSE INetSocket, i den har jeg funktioner til at f.eks. create,accept,read m.m

#include "INetSocket.h"
#include <iostream>
using namespace std;

INetSocket::INetSocket(){
    connected = false;
    sock = -1;
}

INetSocket::INetSocket(int port){
    connected     = false;
    sock         = socket(AF_INET, SOCK_STREAM, 0);
    if(sock < 0) {
        throw socketErr(errno);   
    }
    else {
        thisHost.sin_addr.s_addr = htonl(INADDR_ANY);
      }
   
    // For at vi hurtigt kan genbruge socket til den port
    int yes = 1;
      if (setsockopt(sock,SOL_SOCKET,SO_REUSEADDR,&yes,sizeof(int)) == -1) {
        throw socketErr(errno);
      }
   
    thisHost.sin_family = AF_INET;
      thisHost.sin_port = htons(port);
      acceptPort = port;
      if (bind(sock,(struct sockaddr*)&thisHost,sizeof(thisHost))<0) {
        throw socketErr(errno);
      }   
}

void INetSocket::Create() {
  connected = false;
  sock = socket(PF_INET,SOCK_STREAM,0);
  if (sock < 0) {
    throw socketErr(errno);
  }
}

void INetSocket::Listen(ulong MaxConnections) {
      if (listen(sock,MaxConnections)<0) {
        throw socketErr(errno);
      }   
}

void INetSocket::Accept(INetSocket* newSocket) {
    size_t size = sizeof(struct sockaddr_in);
      struct sockaddr_in tmp;
    int newsock = accept(sock,(struct sockaddr*)&tmp,&size);
      remoteHost = tmp;
      if (newSocket < 0)
        throw socketErr(errno);
      newSocket->sock = newsock;
      newSocket->connected = true;
      newSocket->acceptPort = acceptPort;   
    memcpy(&newSocket->remoteHost,&remoteHost,size);
    // så kan vi måske samle oplysninger om den connected remote host
}

void INetSocket::Connect(const char* host,ushort port) {
      struct hostent* hostinfo;
      remoteHost.sin_family = AF_INET;
      remoteHost.sin_port = htons(port);
      hostinfo = gethostbyname(host);
    if (hostinfo == NULL) {
      throw socketErr(errno);
      }
      remoteHost.sin_addr = *(struct in_addr*)hostinfo->h_addr;
     
      if (connect(sock,(struct sockaddr*)&remoteHost,sizeof(remoteHost))<0) {
        throw socketErr(errno);
      }
      connected = true;
}



int INetSocket::Write(const char* buf, int len) {
  int written = write(sock, buf, len);
  if ( written != len )
    return -1;
  return written;
}

int INetSocket::Read(char* buf,ulong len) {
  return read(sock,buf,len);
}

bool INetSocket::IsConnected() {
  return connected;
}

int INetSocket::GetSocket() {
  return sock;
}

void INetSocket::Shutdown(int action) {
  shutdown(sock,action);
}

void INetSocket::Close() {
  close(sock);
  connected = false;
}

/*int main() {
    INetSocket test(80);
    return 0;   
}*/


Denne main virker hvis den bliver kommenteret "ind". Men hvis jeg laver en anden cpp fil, test.cc som ser sådan ud:

#include "INetSocket.h"

int main() {
    INetSocket test;
    return 1;
}


Den kan godt kompillere med ikke bygge, jeg får følgende fejl.

Bygger fil: test.cc...
g++      "test.cc"    -o "test"
/tmp/ccqobXlR.o(.text+0x18): In function `main':
: udefineret reference til "INetSocket::INetSocket[in-charge]()"
collect2: ld returned 1 exit status
Completed ... unsuccessful
Total time taken: 1 secs