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Passing by reference or by parameter in lazy evalutation?

Posted by Michael_Rybak at 2006-08-13 15:59:39 on Problem 2963 
Sonsider such two functions:

f(x) = x + 1
g(x) = f(x) + x + 1

Consider lazy evaluation.
If I call g(2+2), it first calls f(2+2), where 2+2 is evaluated. Is that value (2+2=4) returned back to g, so it doesn't evaluate x again, when it needs it in the rest of the function (" + x + 1")?
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