class A
{
B * Bp;
};
class B
{
A * Ap;
};
A REALLY easy classes question
Author
I have 2 classes - A and B, and class A has a pointer to an object of class B, and vice versa. However, when I try and compile, obviously the compiler doesn''t recognise the class B pointer in class A as class B hasn''t yet been defined. The question is, how do I do this? Any help would be much appreciated.
Here''s the source
quote:Original post by benjamin bunny
I have 2 classes - A and B, and class A has a pointer to an object of class B, and vice versa. However, when I try and compile, obviously the compiler doesn''t recognise the class B pointer in class A as class B hasn''t yet been defined. The question is, how do I do this? Any help would be much appreciated.
Here''s the source//// Forward reference here.//class B; class A{ B * Bp; };class B{ A * Ap;};
http://www.geocities.com/ben32768
YAP YFIO,
deadlinegrunt
Use class prototypes. You can do this because the second class isn''t used in class A''s declaration.
--:
class B;
class A
{
B * Bp;
};
class B
{
A * Ap;
};
--:
Note: if class A were declared as:
class A
{
B aB;
};
it wouldn''t work, since B hasn''t been declared, so the compiler won''t know the size of B, and will be unable to allocate space for the B member of class A.
Dark Lord Pi
--:
class B;
class A
{
B * Bp;
};
class B
{
A * Ap;
};
--:
Note: if class A were declared as:
class A
{
B aB;
};
it wouldn''t work, since B hasn''t been declared, so the compiler won''t know the size of B, and will be unable to allocate space for the B member of class A.
Dark Lord Pi
Author
I did wonder if you could do that, but when I tried it last it crashed, so I assumed you couldn''t. Probably a problem somewhere else in my code. Anyway, thanks for the responses. 
http://www.geocities.com/ben32768
http://www.geocities.com/ben32768
This topic is closed to new replies.
Advertisement
Popular Topics
Advertisement
