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guard

   Also found in: Dictionary/thesaurus, Medical, Acronyms, Idioms, Wikipedia, Hutchinson 0.04 sec.
(programming)guard - 1. In functional programming, a Boolean expression attached to a function definition specifying when (for what arguments) that definition is appropriate.

2. In (parallel) logic programming, a Boolean expression which is used to select a clause from several alternative matching clauses.

See Guarded Horn Clauses.

3. In parallel languages, a Boolean expression which specifies when an message may be sent or received.
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He went away thoughtful and anxious and returned to his own room, where he summoned Bernouin and desired him to fetch thither in the morning the special guard he had placed over Monsieur de Beaufort and to awaken him whenever he should arrive.
Twenty Years After by Dumas, Alexandre View in context
Weller and the guard are endeavouring to insinuate into the fore-boot a huge cod-fish several sizes too large for it--which is snugly packed up, in a long brown basket, with a layer of straw over the top, and which has been left to the last, in order that he may repose in safety on the half-dozen barrels of real native oysters, all the property of Mr.
The Posthumous Papers Of The Pickwick Club by Dickens, Charles View in context
At this moment, when the coachman and guard were comparing notes for the last time before starting, on the subject of the way-bill; when porters were screwing out the last reluctant sixpences, itinerant newsmen making the last offer of a morning paper, and the horses giving the last impatient rattle to their harness; Nicholas felt somebody pulling softly at his leg.
The Life and Adventures of Nicholas Nickleby by Dickens, Charles View in context
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