forward definition of c++ class member functions -

i'm writing small generator outputs c++ classes in single cpp file tree object structure ( order of output of classes given tree, fixed).

to keep simple prefer if there way keep in 1 file.

the problem these classes interact each other using member functions , there case forward declarations arent working.

example:

#include <iostream>  using namespace std;   class b; b* global_b=null;  class a; a* global_a=null;  class {      public:     a() {}     ~a() {}      void accessb()     {         global_b->setvalue(1);     }      int getvalue()     {         return 2;     }  };  class b {     public:     b() : j(0) {}     ~b(){}      void setvalue(int i)     {         j = + global_a->getvalue();     }     int j; };   int main() {     global_b = new b();     global_a = new a();      global_a->accessb();     cout << "hello world!" << endl;     return 0; } 

any suggestions/ideas? thanks.

typically, you'd this:

class {      public:     a() {}     ~a() {}      void accessb();   ... }; 

then somewhere after both , b declared:

void a::accessb() {     global_b->setvalue(1); }