It doesn't return an "instance", it returns a reference:
<cffunction name="testfunc">
<cfreturn testfunc />
</cffunction>
<cfset x = testfunc()>
<cfif testfunc.equals(x)>
reference
<cfelse>
copy
</cfif>
Tim.
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> -----Original Message-----
> From: Raymond Camden [mailto:[EMAIL PROTECTED]
> Sent: 20 August 2003 03:55
> To: CF-Talk
> Subject: RE: Uniquely identifying a function
>
>
> Answer my own question. It returns an instance of itself. So
> you could do,
>
> x = foobar();
> y = x();
>
> Not that you would want to, though. :)
>
> ==============================================================
> ==========
> ===
> Raymond Camden, ColdFusion Jedi Master for Mindseye, Inc
> (www.mindseye.com)
> Member of Team Macromedia
> (http://www.macromedia.com/go/teammacromedia)
>
> Email : [EMAIL PROTECTED]
> Blog : www.camdenfamily.com/morpheus/blog
> Yahoo IM : morpheus
>
> "My ally is the Force, and a powerful ally it is." - Yoda
>
> > -----Original Message-----
> > From: Raymond Camden [mailto:[EMAIL PROTECTED]
> > Sent: Tuesday, August 19, 2003 8:07 PM
> > To: CF-Talk
> > Subject: RE: Uniquely identifying a function
> >
> >
> > Interesting tip - even more so - interesting function. Your
> > UDF returns the UDF - what happens if you call it? :)
> >
> > ==============================================================
> > ==========
> > ===
> > Raymond Camden, ColdFusion Jedi Master for Mindseye, Inc
> > (www.mindseye.com)
> > Member of Team Macromedia
> > (http://www.macromedia.com/go/teammacromedia)
> >
> > Email : [EMAIL PROTECTED]
> > Blog : www.camdenfamily.com/morpheus/blog
> > Yahoo IM : morpheus
> >
> > "My ally is the Force, and a powerful ally it is." - Yoda
> >
> > > -----Original Message-----
> > > From: Matt Liotta [mailto:[EMAIL PROTECTED]
> > > Sent: Tuesday, August 19, 2003 7:54 PM
> > > To: CF-Talk
> > > Subject: Re: Uniquely identifying a function
> > >
> > >
> > > BTW, you can get the name of the CFM that the function is
> defined in
> > > by calling the getPagePath() method of the function. See the
> > > following example.
> > >
> > > <cffunction name="foobar">
> > > <cfreturn foobar>
> > > </cffunction>
> > > <cfdump var="#foobar.getPagePath()#">
> > >
> > > -Matt
> > >
> > > On Tuesday, August 19, 2003, at 06:49 PM, Tim Blair wrote:
> > >
> > > >> Obviously, your function names must be unique per CFM, so
> > > the unique
> > > >> name for all functions is a concatenation of the CFM
> name and the
> > > >> function name.
> > > >
> > > > Indeed that is true, the problem comes when I'm trying to
> > work out
> > > > which CFM page contains the function: I'm performing the key
> > > > generation from within the CFC, so it's a bit of a hassle
> > > to work out
> > > > where the function "came from". Any way, the
> toString() method I
> > > > provided initially basically does what you have stated,
> > in a round
> > > > about kind of way.
> > > >
> > > >> Here is a quick UDF (read not tested) that does what you
> > need. ...
> > > >> return theName.hashCode();
> > > >
> > > > That's not going to identify a function uniquely - the
> hashCode()
> > > > method will return the hashcode for the theName variable,
> > > not for the
> > > > function. If I called the method again with exactly the
> > > same value,
> > > > it'd return a different hashcode.
> > > >
> > > > Saying that however, using hashCode() against the
> > function directly
> > > > _will_ work and also saves on the hash() call. I can
> > > replace the key
> > > > generation line:
> > > >
> > > > <cfset key = this.KEYPREFIX & hash(myFuncRef.toString())>
> > > >
> > > > with the following, removing one method call per generation
> > > (not much,
> > > > but I'm sure they'll all add up, especially as it's a
> > > crypto function
> > > > call I'm removing) and guaranteeing the key is unique (and
> > > always the
> > > > same) for that function:
> > > >
> > > > <cfset key = this.KEYPREFIX & myFuncRef.hashCode())>
> > > >
> > > > For those that are wondering, the hashCode() method is a
> > java method
> > > > implemented in the base Object class that all other
> > classes extend
> > > > from by default. By definition it is guaranteed to
> > return a unique
> > > > (integer) ID for each object and if the function is called
> > > on the same
> > > > object more than once during the lifetime of the Java
> application
> > > > (i.e. CFMX), the same hash code will be returned on each call.
> > > > Generally, the unique ID is generated from the internal
> > > memory address
> > > > of the given object.
> > > >
> > > > Additionally, the key generated by the hashCode() method is much
> > > > shorter than using a hash(toString()) representation (8
> > or so bytes
> > > > compared to 32) so storing the key in memory won't eat up
> > > so much RAM.
> > > > Not exactly the biggest gain in the world but sometimes
> > every byte
> > > > counts... ;)
> > > >
> > > > Cheers for the pointer Matt, even if it wasn't exactly what you
> > > > meant... ;)
> > > >
> > > >> You might also be interested in the following Java class
> > > >
> > > > That's cool, but surely the toString() method I stated returns
> > > > (basically) this info anyway, but it is more relevant for
> > the use I
> > > > need because it also includes the sub-class for the function
> > > > reference. Ta anyway - may well come in useful at some point!
> > > >
> > > > The question still remains, is this a sensible way to go?
> > No one's
> > > > come down on me like a ton of bricks so I'm guessing it's OK...
> > > >
> > > > Tim.
> > > >
> > > > -------------------------------------------------------
> > > > RAWNET LTD - Internet, New Media and ebusiness Gurus. Visit our
> > > > new website at http://www.rawnet.com for more information about
> > > > our company, or call us free anytime on 0800 294 24 24.
> > > > -------------------------------------------------------
> > > > Tim Blair
> > > > Web Application Engineer, Rawnet Limited
> > > > Direct Phone : +44 (0) 1344 393 441
> > > > Switchboard : +44 (0) 1344 393 040
> > > > -------------------------------------------------------
> > > > This message may contain information which is legally privileged
> > > > and/or confidential. If you are not the intended
> > recipient, you are
> > > > hereby notified that any unauthorised disclosure, copying,
> > > > distribution or use of this information is strictly
> > prohibited. Such
> > > > notification notwithstanding, any comments, opinions,
> information
> > > > or conclusions expressed in this message are those of the
> > > > originator, not of rawnet limited, unless otherwise
> explicitly and
> > > > independently indicated by an authorised representative
> of rawnet
> > > > limited.
> > > > -------------------------------------------------------
> > > >
> > >
> >
>
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