static class problem.

I am trying to tie these two classes into my Network classes. Presumably, you should only call WSAStartup/WSACleanup in non-overlapping pairs, so I devised this as a way of transparently handling that problem. The compiler errors are simply undefined references to variables of the "static" class. How can I fix that?

Code:

---


//...this class should only be created by "new", and destroyed with "delete"...NO LOCALS...

class WSAInitializer {

  private:

 WSAData wsaData;
 bool awaiting_shutdown;

  public:

WSAInitializer() {
 awaiting_shutdown = false;
  if(WSAStartup(MAKEWORD(1, 1), &wsaData) == 0) {
  awaiting_shutdown = true;
  }
 }

~WSAInitializer() {
  if(awaiting_shutdown) {
    WSACleanup();
  }
 }
};


//....


//...this should be the only class using a WSAInitializer:: object...
//...also, balanced Startup()/Cleanup() calls will ensure ref_count's integrity...(use in constructor/destructor pairs).
class WSA {

 private:
 
static WSAInitializer * instance;
static int ref_count;
 
 public:

WSA() {
 Announce("Initializing...");
 WSA::ref_count = 0;
 }
static void Startup() {
  ++WSA::ref_count;
  if(WSA::ref_count == 1) {
    WSA::instance = new WSAInitializer;
    Announce("WSAStartup Initiated...");
  }
 }
static void Cleanup() {
  --WSA::ref_count;
  if(WSA::ref_count == 0) {
    delete WSA::instance;
    Announce("WSACleanup Initiated...");
  }
 }
}wsa;  //...added this to quiet the compiler, but no avail.





//...EXAMPLE:


class Foo {
 public:
 
 Foo() {
  WSA::Startup();
 }

 ~Foo() {
  WSA::Cleanup();
 }
};





int main() {

 if(condition) {
   
  Foo bar;  //...new WSAInitializer:: born


      if(condition) {
       
        Foo blat;

      }  //...blat's destructor called, WSA::ref_count decrements....
  }  //...bar's destructor called, WSA::destroys current WSAInitializer...


return 0;
}

---

If you have a class with a static member:

Code:

---

class foo
{
public:
  static int bar;
};

---

you have to define/construct the static member outside the class:

Code:

---

//in some .cpp file
int foo::bar = 0;

---

Then it will work

Edit
What is WSA?
I could only find one match in my dictionary, but I don't think it means "Wirtschafts- und Sozialausschluss" :)
/Edit

Indeed. Thanks. :)

I assume it stands for Windows Socket API, and it precedes many of the function names in Winsock.