list with different class objects

[Johan]

Hi,

How to create a list with template classes. I want to do something like this

template<class T>class Callback
{
// rest of class
};

typedef list< template<class T>Callback<T> *> CallbackList;

Later
class A
{
public :
void addCallback( ????? );
// rest of class
CallbackList cl;
};

void A :: addCallback( ???? )
{
cl.push_back< ????? >
}

How to add diffenrent class object to the linked list and what to change for
????

thanks

Johan

 

[Victor Bazarov]

How to create a list with template classes. I want to do something like this

template<class T>class Callback
{
// rest of class
};

typedef list< template<class T>Callback<T> *> CallbackList;

There is no template typedefs. You can only have a typedef of
a particular class/type. You need 'T' defined here.

Later
class A
{
public :
void addCallback( ????? );
// rest of class
CallbackList cl;

You cannot have an object of an incomplete type (even if you
could have template typedefs). You would still need to define
the "T" in your 'CallbackList'.

};

void A :: addCallback( ???? )
{
cl.push_back< ????? >
}

How to add diffenrent class object to the linked list and what to change for
????

Look up "heterogeneous containers" on Google. And if you don't see
it, the very first question you need to ask yourself is "why am I
putting those _unrelated_ objects in the same container?" Perhaps
it will give you the idea to make them related somehow...

V