Template function

[Fergal21]

Hello there,

My application has several different kinds of linked lists, of which all are created dynamically using "new".

I wish to create a template function that will free up the memory when finished with the linked lists.

Is it possible to create a template function that will take different pointers to structures (ie, nodes). And what is the format for it??

Thanks in advance.

[treuss]

You should make a template for your linked list class. Any C++ book/tutorial should have a section on that.

You should also ask yourself why to make a template for lists, if there is already one in the standard C++ library (called list) which you can simply use.

[AvDav]

I'm not sure what are you looking for, but you can always:
template <class T1, class T2, ...>
void foo(T1 *p1, T2 *p2, ...)
{
//whatever stuff.
}

[Fergal21]

AdDav,


I have a template function as follows:

template <class Type> void Delete(Type * list)
{
//do something
}


and its prototype in the header file is:

template <class Type> Delete(Type);


And I call the function as follows:


Delete(list_head);//list head is a pointer to a structure


I get an unresolved external:

int __cdecl Delete(struct V_FSM *)" (?Delete@@YAHPAUV_FSM@@@Z)


Whats wrong with this code?

[Graham]

What's wrong with std::list<>?

[Fergal21]

I have alot of coding done using my own lists. I did not know about the std::list.

[abc_coder]

Originally posted by Fergal21
AdDav,


I have a template function as follows:

template <class Type> void Delete(Type * list)
{
//do something
}


and its prototype in the header file is:

template <class Type> Delete(Type);


And I call the function as follows:


Delete(list_head);//list head is a pointer to a structure


I get an unresolved external:

int __cdecl Delete(struct V_FSM *)" (?Delete@@YAHPAUV_FSM@@@Z)


Whats wrong with this code?

1. unless it's a typo, your prototype doesn't match the implementation - the argument has to be a pointer.

2. template code must reside in the header file - so you probably want to replace the header declaration of the function with the actual definition. this is the usual reason for the unresolved external error.