Allow testing for valid object in LUA ("invalid object"); obj:isvalid() about awesome HOT 4 CLOSED

You meaning testing like in if foo then, right? Well, lua can't let you do that, because a userdata is a userdata. Only false and nil ever can be, well, false.

If you want something like this, I'd rather propose a obj:isvalid() (suggestions for the name welcome) to be added to common/luaobjects.h (so that it is available on all objects, not only clients).

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You meaning testing like in if foo then, right?

Yes.

Only false and nil ever can be, well, false.

Can we change a client object to nil after it has been destroyed?

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A client object is a userdata and always will be (and can't be changed into e.g. nil). As I said, all that we can do is adding something like obj:isvalid(). Only nil and false ever evaluate to false.

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I see. obj:isvalid() seems to be good then.

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