| getS3method {utils} | R Documentation |
Get an S3 Method
Description
Get a method for an S3 generic, possibly from a namespace or the generic's registry.
Usage
getS3method(f, class, optional = FALSE, envir = parent.frame())
Arguments
f |
a character string giving the name of the generic. |
class |
a character string giving the name of the class. |
optional |
logical: should failure to find the generic or a method be allowed? |
envir |
the |
Details
S3 methods may be hidden in namespaces, and will not
then be found by get: this function can retrieve
such functions, primarily for debugging purposes.
Further, S3 methods can be registered on the generic when a namespace is loaded, and the registered method will be used if none is visible (using namespace scoping rules).
It is possible that which S3 method will be used may depend on where
the generic f is called from: getS3method returns the
method found if f were called from the same environment.
Value
The function found, or NULL if no function is found and
optional = TRUE.
See Also
Examples
require(stats)
exists("predict.ppr") # false
getS3method("predict", "ppr")