guard

<programming> 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.

Nearby terms:
GT/SQL « gu « guaranteed scheduling « guard » Guarded Horn Clauses » gubbish » GUI