Re: EnumChildWindows and C++

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"Kevin Cochran" <KevinCochran@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote in
message news:BF3E7350-25E8-4DD1-96BD-4C1C531B4580@xxxxxxxxxxxxx

Greetings John,

Yep, making it static worked. Could you recommend a resource that will
explain in depth how to use static and non-static member functions in
C++? I only recently began switching to C++ from C, so any good
resources would be appreciated.


Any C++ textbook should do it. A good one that is available both as a free
download and as a non-free printed book is Bruce Eckel: Thinking in C++.

http://mindview.net/Books/TICPP/ThinkingInCPP2e.html

The EnumChildWindows function is designed to take a C-style non-member
callback function. Generally a *public* static member function can be used
whereever a C-style non-member function can be used.

Compared to a non-member function, a static member function has two
properties:

1. It has access rights to public, protected and private members of the
class to which it belongs in the same way that a non-member "friend"
function does.
2. It can itself be public, protected or private.

What distinguishes a static member from a non-static member is that a static
member is not tied to an object of the class. To illustrate, suppose we have
a class X. We may define an object of class X as:

X x;

We can then call an ordinary member function:

x.ordinary_member();

ordinary_member() has an implicit argument, which is the "this" pointer of
x. The effect of this is that x's data members are "in scope" within the
definition of ordinary_member.

We can also call

x.static_member();

but static_member() does not have an implicit "this" pointer argument (this
absence of a hidden argument makes it like a non-member function, which is
why it is can be used in place of a non-member function in most contexts).
For static_member() to be able to refer to x's data members, it must take a
pointer/reference to x as an argument, e.g.,

x.static_member(&x);

Again, this is what you would do with a non-member function.

A static member can also be called with an alternative syntax:

X::static_member();

This means that, as with a non-member function, you can call a static member
without having an object of the class to bind it to (you can of course only
call it if the static member function is public or it is being called from a
function with the necessary access rights --- e.g., a friend function).


--
John Carson

.

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