Template instantiation

Jarrett Billingsley jarrett.billingsley at gmail.com
Fri Mar 20 10:31:13 PDT 2009

On Fri, Mar 20, 2009 at 11:35 AM, Trass3r <mrmocool at gmx.de> wrote:
> Got the following code:
> public LuaState wrapClass (T) (T instance)
> {
>        auto ptr = cast (T *) newUserdata ( (T *).sizeof);
>        *ptr = instance;
>        loadClassMetatable (typeid(T).toString);
>        setMetatable (-2);
>        return this;
> }
> Am I right in assuming that a different wrapClass will be created in the
> final executable for each template instantiation (e.g. calls with class
> A,B,C,... instances) and would thus bloat up the executable a bit when used
> with many classes?


> Apart from that, couldn't you just use wrapClass (Object instance)? In the
> end each class instance pointer takes up the same amount of memory?!

I'd say yes.  It doesn't look like there's any need for a template here.

It wouldn't be (Object*).sizeof when allocating the userdata, though;
just Object.sizeof.

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