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List S7 methods

Source: R/introspect.R
S7_methods.Rd

List the methods registered on an S7 generic, or the methods registered for a given class across all S7 generics defined in attached packages.

Usage

S7_methods(generic = NULL, class = NULL)

Arguments

generic

An S7 generic.

class

A class specification (anything accepted by as_class()). When supplied, every S7 generic in every attached package is searched for methods with this class in their signature.

Value

A data frame with one row per matching method and columns:

  • generic: the generic's name.

  • package: the package the generic is defined in, or NA for generics found in the global environment (or when generic is supplied directly).

  • signature: a list column of S7_signature objects describing the dispatch signature. format() them for a human-readable description.

Examples

Foo <- new_class("Foo", package = NULL)
Bar <- new_class("Bar", package = NULL)
my_gen <- new_generic("my_gen", "x")
method(my_gen, Foo) <- function(x) "foo"
method(my_gen, Bar) <- function(x) "bar"

S7_methods(generic = my_gen)
#>   generic package signature
#> 1  my_gen    <NA>     <Foo>
#> 2  my_gen    <NA>     <Bar>
S7_methods(class = Foo)
#> [1] generic   package   signature
#> <0 rows> (or 0-length row.names)