nested classes

[sakis_t]

Hi,
I have this problem:


class A
{
class B
{
A a;
};
};




The problem is that I can't use class A within class B because class A has not yet been declared entirely.
Is there any way to declare a nest class outside the base class so the nested class can use the base class?
Thanx.

[Indian_Techie]

Hi,

I dont think that u can declare like that. Why do you want to declare an object of class A in class B? You can any way access all the members of A. Can you tell me a practical situation like that?

John

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[sakis_t]

Hi,

Yes you can declare this, its used mostly for hiding helper classes that can only been used by your base class and you don't want to accidentally use them.

[hhao]

Hi,

Have you tried template, instead of writing class A in class B? And then when you call the class a, you can fill in the exact class insteadof the template.

class A
{
class B
{
template a;
};
};

Best regards,
Hao

[sakis_t]

Hi,

I'm not aware of this syntax of template keyword, can you spare a little time for explain it to me? I'll be grateful.
Thanks for replying.

[hhao]

Hi,

Sorry for my delay.

According to your question, I think maybe we can find another way. For example,

class A;
class B{
A a;
};
class A{
B b;
};

Do you think it easier and can also satisfy you?

Hao

[sakis_t]

No, sorry.
I think that the solution will be something like this (I can't test it right now because I don't have a compiler in this computer)

class A
{
class B;
};

class A::B
{
A a;
};