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The Guarded Command Language (GCL) is a programming language defined by Edsger Dijkstra for predicate transformer semantics in EWD472. [1] It combines programming concepts in a compact way. It makes it easier to develop a program and its proof hand-in-hand, with the proof ideas leading the way; moreover, parts of a program can actually be ...
The term is used with specific meaning in APL, Haskell, Clean, Erlang, occam, Promela, OCaml, Swift, [2] Python from version 3.10, and Scala programming languages. [citation needed] In Mathematica, guards are called constraints. Guards are the fundamental concept in Guarded Command Language, a language in formal methods.
Predicate transformer semantics were introduced by Edsger Dijkstra in his seminal paper "Guarded commands, nondeterminacy and formal derivation of programs".They define the semantics of an imperative programming paradigm by assigning to each statement in this language a corresponding predicate transformer: a total function between two predicates on the state space of the statement.
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