Define a pointer to a function, for example:
INT Cuckoo (int Baby);
It can be used to define a pointer to the function:
INT (* PCUCKOO) (INT);
If you want to define the type of all function pointers (can be conveniently declared multiple variables), you can do this:
TYPEDEF INT (*) (int) funpointertype;
Use this type to declare a function pointer as follows:
FunpoIntertype pcuckoo;
FunpoIntertype pshrimp;
Ok, since we have a function pointer, how do you initialize it?
IT's a piece of cake!
PCUCKOO = & coke;
Pshrimp = & cokoo;
OK, how to use them? It is very simple to say nonsense:
PCUCKOO (3);
OR (* PCUCKOO) (3);
It's so simple!
However, in the actual use process, some function parameters are a function pointer, for example:
Void Test (int));
So how do you call TEST? It's simpler:
Test (PCUCKOO);
Oh, is it big me?
Don't worry, sometimes we will encounter such a problem. If you want to pass a member function in a class to Test, can you do this?
Oh, you try:
Class A
{
A ()
{
TEST (TRY);
}
~ A ();
INT TRY (INT NTIMES);
}
Hey, the compiler will tell you unrestricratic, there is a problem!
Why do this look? The answer is also relatively simple: a THIS pointer is hidden in the parameter list of all member functions (what is it?) Blame!
How to do? Still simpler:
The solution is to change this member function to static, so ok!
Ok, what else, I didn't say it clearly? Please send email to alittleshrimp@gmail.com Welcome to harassment! :)
