snap

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snap

1. Informal See snapshot
2. Brit a card game in which the word snap is called when two cards of equal value are turned up on the separate piles dealt by each player
3. American football the start of each play when the centre passes the ball back from the line of scrimmage to a teammate

snap

[snap]
(meteorology)
A brief period of extreme (generally cold) weather setting in suddenly, as in a “cold snap.”

SNAP

[snap]
(nucleonics)
A small nuclear power plant in which heat from radioisotope decay in a fuel such as strontium-90 is converted into electric energy, to provide power for spacecraft instrumentation, telemetry, and other applications. Derived from systems for nuclear auxiliary power.

rivet set, rivet snap, setting punch, snap

rivet set
A tool for shaping the head of a rivet.

SNAP

(language)
1. An early (IBM 360?) interpreted text-processing language for beginners, close to basic English.

["Computer Programming in English", M.P. Barnett, Harcourt Brace 1969].

2. ["Some Proposals for SNAP, A Language with Formal Macro Facilities", R.B. Napper, Computer J 10(3):231-243, 1967].

snap

(2)
1. <programming> To remove indirection, e.g. by replacing a pointer to a pointer with a pointer to the final target (see chase pointers).

The underlying metaphor may be a rubber band stretched through a number of points; if you release it from the intermediate points, it snaps to a straight line from first to last.

Often a trampoline performs an error check once and then snaps the pointer that invoked it so subsequent calls will bypass the trampoline (and its one-shot error check). In this context one also speaks of "snapping links". For example, in a Lisp implementation, a function interface trampoline might check to make sure that the caller is passing the correct number of arguments; if it is, and if the caller and the callee are both compiled, then snapping the link allows that particular path to use a direct procedure-call instruction with no further overhead.
References in classic literature ?
Without rest or pause--while those frumious jaws Went savagely snapping around- He skipped and he hopped, and he floundered and flopped, Till fainting he fell to the ground.
The snapping of a twig aroused Brady out of a dead sleep, and as he opened his eyes, he saw that it was broad daylight and that at twenty paces from him stood a huge lion.
High-speed video and fancy math have overturned an old theory about how snapping shrimp make such a racket.