let floating
<programming> 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)
Nearby terms:
LERP « less than « LessTif « let floating »
letterbomb » level 1 cache » level 2 cache
letterbomb
<messaging> 1. An e-mail message containing live data intended to do
nefarious things to the recipient's computer or terminal. It is possible, for
example, to send letterbombs that will lock up some specific kinds of terminals
when they are viewed, so thoroughly that the user must turn the terminal off to
unwedge it. Under Unix, a letterbomb can also try to get part of its contents
interpreted as a shell command. The results of this could range from silly to
tragic.
See also Trojan horse; compare nastygram, talk bomb.
2. Loosely, a mailbomb.
[Jargon File]
(1998-01-16)
Nearby terms:
less than « LessTif « let floating « letterbomb
» level 1 cache » level 2 cache » LEVEL5 OBJECT
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