Boost logo

Boost :

Subject: Re: [boost] [msm] eUML guard/action location
From: Christophe Henry (christophe.j.henry_at_[hidden])
Date: 2009-12-14 09:45:37

>Yes it is an interesting "hack".How "pretend" have you been able to make
>I was actually thinking about exactly this today (long drive - actually
>- correction - I was thinking about it yesterday - it's now early
>morning here) and wondering what the consequences were. Does it result
>in actually default constructing all these (temporary) objects? Won't
>that be expensive and/or have undesirable side effects?

This is actually what I find so cool with the typeof feature (is it
too late to donate a kidney for it? ;-) ).
We are calling constructors and lots of operators and it costs nothing
run-time because typeof only evaluate the return value of
So no call actually happens. All what you have really is a typedef.
The only side effect (besides compiler support) is that you need an
empty constructor or would be forced to pass some dummy value.

Boost list run by bdawes at, gregod at, cpdaniel at, john at