struct myStruct {
     int number;
     static int counter;
};

myStruct *tmp;

tmp = new myStruct;
tmp->number = myStruct::counter;  // problem

myStruct::counter++;              // problem

#include <iostream>// define the structstruct myStruct{  myStruct();  int i;  // this declares the static variable  // no storage is allocated for it yet  static int counter;};// this actually defines it, and makes it exist// (storage for the variable in created in the // executable) Should go in a .cpp file (_not_ .h)int myStruct::counter = 0;// now, in other code you should be able to access it easilymyStruct::myStruct(){  i = ++counter;}int main(int argc,char** argv){  using namespace std;  myStruct* v1 = new myStruct();  myStruct* v2 = new myStruct();  myStruct* v3 = new myStruct();  cout << v1->i << endl;  cout << v2->i << endl;  cout << v3->i << endl;    delete v1;  delete v2;  delete v3;  return 0;};