| slovo | definícia |
let floating
(foldoc) | let floating
A program transformation used in {functional
programming} to implement full laziness. E.g. the function
f x = x + sqrt 4
can be expressed as
f x = let t = sqrt 4 in x + t
but note that t does not depend on the argument x so we can
automatically transform this to
t = sqrt 4
f x = x + t
Making t into a global constant which need only be evaluated
at most once, rather than every time f is called. The general
idea is to float each subexpression as far out (toward the
top level) as possible to maximise sharing.
(1997-07-09)
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