Re: [sc-users] BooleanUGens (was Re: conditional statement in SynthDef)

[James Harkins <jamshark70@xxxxxxxxx>]

On Sep 4, 2005, at 4:50 PM, Joshua Parmenter wrote:

> Hi everyone,
>
> After talking to Dan a little bit, I decided to make a few quick UGens that do some basic Boolean stuff.  They return 0 for false, 1 for true.  There is:
>
> IsEqual, IsNotEqual, IsLess, IsLessOrEqual, IsGreater, IsGreaterOrEqual

I don't think there is a need for new UGens. BinaryOpUGens.cpp already implements opEQ and opNE:

<x-tad-smaller>s.boot;

a = {	</x-tad-smaller><x-tad-smaller>|a = 0, b = 0|</x-tad-smaller><x-tad-smaller>
</x-tad-smaller><x-tad-smaller>Impulse</x-tad-smaller><x-tad-smaller>.kr(1), 0, </x-tad-smaller><x-tad-smaller>'=='</x-tad-smaller><x-tad-smaller>, a, b))
}.play

o = </x-tad-smaller><x-tad-smaller>OSCresponderNode</x-tad-smaller><x-tad-smaller>(s.addr, </x-tad-smaller><x-tad-smaller>'/tr'</x-tad-smaller><x-tad-smaller>, { </x-tad-smaller><x-tad-smaller>|t, r, m|</x-tad-smaller><x-tad-smaller> m.postln }).add;

a.set(</x-tad-smaller><x-tad-smaller>\a</x-tad-smaller><x-tad-smaller>, 1);
a.free;
o.remove;
</x-tad-smaller>
So the issue is merely that AbstractFunction doesn't implement == and != -- why could UGen not simply implement those two operators?

So IsEqual requires no c code, just:

IsEqual {
*kr { |a, b|
BinaryOpUGen('==', a, b)
}
}

Or, is that how you did it, Josh? Haven't downloaded the pack.

hjh

: H. James Harkins
: jamshark70@xxxxxxxxxxxxxxxxx
: http://www.dewdrop-world.net
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