meaning of closure

1. The act of shutting; a closing; as, the closure of a chink.
That which closes or shuts; that by which separate parts are fastened or closed.
That which incloses or confines; an inclosure.
A conclusion; an end.
A method of putting an end to debate and securing an immediate vote upon a measure before a legislative body. It is similar in effect to the previous question. It was first introduced into the British House of Commons in 1882. The French word cloture was originally applied to this proceeding.
closure 1. 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. 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.

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closure | closure conversion |

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