hasMethod
Search for a Method for a Generic Function
Description
Checks if a generic function has a method with a given signature,
possibly via class extensions or group generics.
Usage
hasMethod(f, signature = character(),
where = .genEnv(f, topenv(parent.frame())))
Arguments
| f |
a character string. The name of the generic function.
|
| signature |
a string vector. The signature of the method to search for.
If signature is not supplied, searches for a default method.
|
| where |
the package environment to search.
Supply either an environment defining a package
or a number representing its position in the search path.
If where is missing, all attached packages are searched.
|
Value
returns a logical value. TRUE if the generic function has a method
(possibly via class extensions or group generics) for signature sig;
otherwise returns FALSE.
See Also
Examples
setGeneric("setG", function(x)standardGeneric("setG"))
setMethod("setG", "numeric", function(x) x^2)
hasMethod("setG")
# FALSE -- has no default method
hasMethod("setG","numeric")
# TRUE -- has method with this signature
hasMethod("setG","integer")
# TRUE -- has inherited method for this signature