Search for a Method for a Generic Function

existsMethod

Description

Checks if a generic function has a method whose signature exactly matches a given signature.

Usage

existsMethod(f, signature = character(), where = topenv(parent.frame()))

Arguments

f	the name of the generic function.
signature	the signature of the method to search for.
where	the package environment to search. Supply either an environment or a number representing its position in the search path. If where is missing, all attached packages are searched.

Value

returns a logical value. It returns TRUE if generic function f has a method that matches the signature sig exactly. Otherwise, it returns FALSE.

See Also

hasMethod, getMethod, selectMethod, findMethod, setMethod.

Examples

setGeneric("setG", function(x)standardGeneric("setG"))
setMethod("setG", "numeric", function(x) x^2)
existsMethod("setG", "numeric") # TRUE
existsMethod("setG", "integer") # FALSE

Package methods version 6.1.1-7
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