Re: An stl list of function pointers

From:
=?ISO-8859-1?Q?Daniel_Kr=FCgler?= <daniel.kruegler@googlemail.com>
Newsgroups:
comp.lang.c++.moderated
Date:
Wed, 4 Nov 2009 05:18:47 CST
Message-ID:
<296cc4f8-9520-4179-bb34-59a9582268e5@k17g2000yqb.googlegroups.com>
On 4 Nov., 00:28, Sam Price <thesampr...@gmail.com> wrote:

In my project I want to create a list of functions that I am going to
iterate over and call sequentially.

Im not quite sure how to define an stl list of function pointers.

#include <list>
my best guess that is wrong.
list<void(* functionName)(int id,void *message)> functionList;


1) Add a std:: qualifier in front of list.
2) Remove the "functionName" from the declaration, it is not part
of the declaration of a function pointer type description that is
part of another declaration (functionList). You probably mixed that
up with type declarations like

typedef void(* functionName)(int id,void *message);

where functionName is the declared name for the type
void(*)(int id,void *message). It is interesting to observe
that function parameters can be arbitrarily sprinkled,
even though they are redundant. So the second
declaration could be shortened to

typedef void(* functionName)(int,void*);

and the first one to

std::list<void(*)(int,void*)> functionList;

but this is rarely done because code readers often like to
understand what function parameters stand for.

If you want to provide a good name for the value type
of this list, you can combine both approaches:

typedef void(* call_back)(int,void*);
std::list<call_back> functionList;

HTH & Greetings from Bremen,

Daniel Kr?gler

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