Help with function declaration error

Hello,

I am working on a project for NACHOS (an OS for learning in C++)

I am implementing a compare function based on a list template.

The declaration for the compare function is in the header file and is as follows:

Code:

---

int (*compare)(T x, T y);

---

// function for sorting list elements

I have written the function and my declaration in the .cc file as follows:

Code:

---

template <class T>
int
(*SortedList<T>::compare)(T x, T y)
{
       
}

---

When I compile in Linux I get the following error:

error : invalid function declaration

I am a little stifled as to what I'm doing wrong... I am new to programming with templates in this capacity and some help would be great. Thank you very much!

Best regards,

You are trying to declare function pointers.

A template function looks like this:

Code:

---

template <class T>
int compare(const T& a, const T& b);

---

and it can't be separated between a declaration in a header and an implementation in a source file (templates must be entirely in the header).