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On 11 Oct 2001 11:18:06 -0400, Warp wrote:
>Ron Parker <ron### [at] povray org> wrote:
>: Foo(0+C);
>
>: leads to two different results. B gets set to 5, but C gets left alone,
>: because "B" can be passed as a reference but the expression "0+C" can't.
>
> As a programmer I would interpret that in the way that a temporary
>indentifier is created in order to hold the result of "0+C", and a reference
>to this temporary identifier is passed to the macro. After the macro call
>ends, this temporary identifier is destroyed.
Except that's not actually how it's implemented. A local is created in
both cases, but in one case it's a local of type "reference to parameter"
and in the other case it's a local of type "floating point value."
--
plane{-z,-3normal{crackle scale.2#local a=5;#while(a)warp{repeat x flip x}rotate
z*60#local a=a-1;#end translate-9*x}pigment{rgb 1}}light_source{-9red 1rotate 60
*z}light_source{-9rgb y rotate-z*60}light_source{9-z*18rgb z}text{ttf"arial.ttf"
"RP".01,0translate-<.6,.4,.02>pigment{bozo}}light_source{-z*3rgb-.2}//Ron Parker
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