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Category: functors Component type: concept


A Predicate is a UnaryFunction whose result represents the truth or falsehood of some condition. A Predicate might, for example, be a function that takes an argument of type int and returns true if the argument is positive.

Refinement of


Associated types

Result type The type returned when the Predicate is called. The result type must be convertible to bool.


F A type that is a model of Predicate
X The argument type of F
f Object of type F
x Object of type X

Valid expressions

Name Expression Type requirements Return type
Function call f(x)   Convertible to bool

Expression semantics

Name Expression Precondition Semantics Postcondition
Function call f(x) x is in the domain of f. Returns true if the condition is satisfied, false if it is not. The result is either true or false.

Complexity guarantees



  • bool (*)(int)


See also

AdaptablePredicate, BinaryPredicate, AdaptableBinaryPredicate

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