help?

[stroken]

how should you solve this problem?

// from a header file

#ifndef LONG_AND_UNIQUE_NAME
#define LONG_AND_UNIQUE_NAME

namespace name_of_package {

   class A {
   public:
      A(B *);
      ...
   private:
      B *p_b;
   }

   class B {
       ...
   private:
      A *p_a;
   }
}

[r035198x]

how should you solve this problem?

// from a header file

#ifndef LONG_AND_UNIQUE_NAME
#define LONG_AND_UNIQUE_NAME

namespace name_of_package {

   class A {
   public:
      A(B *);
      ...
   private:
      B *p_b;
   }

   class B {
       ...
   private:
      A *p_a;
   }
}

Did you try it yourself first. See the guidelines.

[weaknessforcats]

// from a header file

#ifndef LONG_AND_UNIQUE _NAME
#define LONG_AND_UNIQUE _NAME

namespace name_of_package {

class A {
public:
A(B *);
...
private:
B *p_b;
}

class B {
...
private:
A *p_a;
}
}

Use a forward reference. That's enough information for the compiler to know that class B exists and that is enough to allow a pointer to an object of class B.

[code=cpp]
// from a header file

#ifndef LONG_AND_UNIQUE _NAME
#define LONG_AND_UNIQUE _NAME

namespace name_of_package {

class B; //forward reference

class A {
public:
A(B *);
...
private:
B *p_b;
}

class B {
...
private:
A *p_a;
}
}
[/code]

[stroken]

Use a forward reference. That's enough information for the compiler to know that class B exists and that is enough to allow a pointer to an object of class B.

Thanks.

:) :) :) :) :) :) :)