Re: [Dev-C++] class forward

[Per W. <pw...@ia...>]

Don't implement all code inline, it isn't a requirement as in Java.

Normally, you put most of your code in a cpp file, while the class
declaration and some small - very small normally - methods are inline in
the header file.

Class forwarding may only allow you to declare functions taking the class
as parameter - not to actually access the forward-declared class.

You may write:

class class A;

class classB {
private:
    classA *pClassA;
    classA &rClassA;

    // Forbidden - don't know size of classA!
    classA classA;

public:
    classB(classA *pClassA);
    classB(classA &rClassA);

    // Forbidden - don't know size of classA!
    classB(classA classA);

    void do_something(classA *pClassA) {
        // Forbidden - don't know interfaces of classA!
        pClassA->do_something;
    }
}

/Per W

On Thu, 30 Jan 2003, Lu=EDs Br=E1s wrote:

> I'm trying to compile this program in Dev-C++:
>
> ------------------------------------------------------
>
> #include <iostream>
> #include <stdlib.h>
>
> using namespace std;
>
> class classA;
>
> class classB
> {
> private:
>   int num_classB;
> public:
>   classB(void)
>   {
>     num_classB =3D 0;
>   }
>   classB(int num)
>   {
>     num_classB =3D num;
>   }
    void user_classA();
> };
>
> class classA
> {
> private:
>   int num_classA;
>   classB objA;
> public:
>   classA(void)
>   {
>     num_classA =3D 0;
>   }
>   classA(int num)
>   {
>     num_classA =3D num;
>   }
>   void resultado(void)
>   {
>     cout << num_classA << endl;;
>   }
>   void set_resultado(int num)
>   {
>      num_classA =3D num;
>   }
> };

void classB::user_classA() {
    classA objA;
    objA.set_resultado(10);
    objA.resultado();
}

>
> int main(int argc, char *argv[])
> {
>
>   classB obj;
>   obj.usar_classA();
>
>   system("PAUSE");
>   return 0;
> }
>
> ------------------------------------------------------
>
> any help?
>
>
>
> =3D=3D=3D=3D=3D
> +=3D+=3D+=3D+=3D+=3D+=3D+=3D+=3D+=3D+=3D+=3D+=3D+=3D+=3D+=3D+=3D+=3D+=3D+=
=3D+=3D+=3D+=3D+=3D+=3D+=3D+=3D+=3D+=3D+=3D+=3D
> Lu=EDs Filipe Delgado Br=E1s
> lf...@ya...
> http://www.fotopt.net/autor.asp?autor=3D2637
> +=3D+=3D+=3D+=3D+=3D+=3D+=3D+=3D+=3D+=3D+=3D+=3D+=3D+=3D+=3D+=3D+=3D+=3D+=
=3D+=3D+=3D+=3D+=3D+=3D+=3D+=3D+=3D+=3D+=3D+=3D
>
> __________________________________________________
> Do you Yahoo!?
> Yahoo! Mail Plus - Powerful. Affordable. Sign up now.
> http://mailplus.yahoo.com
>
>
> -------------------------------------------------------
> This SF.NET email is sponsored by:
> SourceForge Enterprise Edition + IBM + LinuxWorld =3D Something 2 See!
> http://www.vasoftware.com
> _______________________________________________
> Dev-cpp-users mailing list
> Dev...@li...
> TO UNSUBSCRIBE: http://www.noicys.cjb.net/devcpp/ub.htm
> https://lists.sourceforge.net/lists/listinfo/dev-cpp-users
>