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O que (quem) é closures - definição
WIKIMEDIA DISAMBIGUATION PAGE
Clausure; Closure (disambiguation); Closure (general); Closures; Closure (album); Closure (Song); Closure (song)
closure
1. <programming> In a reduction system, a closure is a data
structure that holds an expression and an environment of
variable bindings in which that expression is to be evaluated.
The variables may be local or global. Closures are used to
represent unevaluated expressions when implementing
functional programming languages with lazy evaluation. In
a real implementation, both expression and environment are
represented by pointers.
A suspension is a closure which includes a flag to say
whether or not it has been evaluated. The term "thunk" has
come to be synonymous with "closure" but originated outside
functional programming.
2. <theory> In domain theory, given a {partially ordered
set}, D and a subset, X of D, the upward closure of X in D is
the union over all x in X of the sets of all d in D such that
x <= d. Thus the upward closure of X in D contains the
elements of X and any greater element of D. A set is "upward
closed" if it is the same as its upward closure, i.e. any d
greater than an element is also an element. The downward
closure (or "left closure") is similar but with d <= x. A
downward closed set is one for which any d less than an
element is also an element.
("<=" is written in LaTeX as subseteq and the upward
closure of X in D is written uparrow_D X).
(1994-12-16)
closure
(closures)
1.
The closure of a place such as a business or factory is the permanent ending of the work or activity there.
...the closure of the Ravenscraig steelworks...
Almost three in four clinics say they face closure by the end of the year.
N-VAR
2.
The closure of a road or border is the blocking of it in order to prevent people from using it.
N-COUNT: usu with supp
3.
If someone achieves closure, they succeed in accepting something bad that has happened to them. (mainly AM)
I asked McKeown if the reunion was meant to achieve closure.
N-UNCOUNT
Closure
The closing or completion of a circuit by depressing a key or moving a
switch.
Exemplos do corpo de texto para closures
1. Bush on Monday to seek the reversal of proposed closures for two Gulf Coast naval bases, saying the closures would further delay disaster response in the region.
2. Since the blasts on July 7 there have been 110 incidents involving unattended baggage, resulting in 61 station closures and 4' line closures.
3. Critics claim the plans will lead to hospital closures.
4. Maryland, in contrast, has no planned road closures.
5. But campaigners fear that any closures could endanger patients.