From: Andrea Dallera <andrea@...>
Date: 2012-08-06T02:19:08+09:00
Subject: Redefining constants for a given instance only


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Hello,=0A=0A=C2=A0 =C2=A0 let's say we have two empty classes:=0A=0Aclass=
 ClassA=0A=0Aend=0A=0Aclass ClassB=0A=0Aend=0A=0Athen we have a third one=
, which has a method that references the first class:=0A=0Aclass Evaluato=
r=0A=C2=A0 =C2=A0=0A=C2=A0 =C2=A0def evaluate=0A=C2=A0 =C2=A0 =C2=A0 =C2=A0=
return ClassA=0A=C2=A0 =C2=A0end=0A=0Aend=0A=0AWhat I'd like to do is to =
be able to redefine what ClassA is for a given instance of Evaluator, lik=
e so:=0A=0Aev =3D Evaluator.new=0A<redefine ClassA to ClassB in some way,=
 for ev only>=0Aev.evaluate #ClassB=0A=0AI found out how to do this, but =
only class-wide:=0A=0Aev =3D Evaluator.new=0Aev.evaluate #ClassA=0Aclass =
Evaluator=0A=C2=A0 ClassA =3D ClassB=0Aend=0Aev.evaluate #ClassB=0A=0AIde=
as?=0A=0AAndrea=0A=0A=C2=A0=0A--=0A=C2=A0=0Ahttp://usingimho.wordpress.co=
m=0Ahttp://github.com/bolthar

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=0A<div class=3D"xam_msg_class">=0A<div style=3D"font: normal undefined u=
ndefined; color:undefined;"><div>Hello,</div><div><br></div><div>&nbsp; &=
nbsp; let's say we have two empty classes:</div><div><br></div><div>class=
 ClassA</div><div><br></div><div>end</div><div><br></div><div>class Class=
B</div><div><br></div><div>end</div><div><br></div><div>then we have a th=
ird one, which has a method that references the first class:</div><div><b=
r></div><div>class Evaluator</div><div>&nbsp; &nbsp;</div><div>&nbsp; &nb=
sp;def evaluate</div><div>&nbsp; &nbsp; &nbsp; &nbsp;return ClassA</div><=
div>&nbsp; &nbsp;end</div><div><br></div><div>end</div><div><br></div><di=
v>What I'd like to do is to be able to redefine what ClassA is for a give=
n instance of Evaluator, like so:</div><div><br></div><div>ev =3D Evaluat=
or.new</div><div>&lt;redefine ClassA to ClassB in some way, for ev only&g=
t;</div><div>ev.evaluate #ClassB</div><div><br></div><div>I found out how=
 to do this, but only class-wide:</div><div><br></div><div>ev =3D Evaluat=
or.new</div><div>ev.evaluate #ClassA</div><div>class Evaluator</div><div>=
&nbsp; ClassA =3D ClassB</div><div>end</div><div>ev.evaluate #ClassB</div=
><div><br></div><div>Ideas?</div><div><br></div><div>Andrea</div><div><br=
></div><div>&nbsp;</div><div>--</div><div>&nbsp;</div><div>http://usingim=
ho.wordpress.com</div><div>http://github.com/bolthar</div></div>=0A</div>=
=0A

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