Access the data inside an S4 method definition

Access the data inside an S4 method definition

Usage

methodFunction(f, signature, package)

methodFormals(f, signature, package)

Arguments

f

a generic function or the character-string name of one.

signature

the signature of classes to match to the arguments of f. See the details below.

package

character(1). Package name.

Value

• methodFormals: list. Extract the sealed formal arguments.

• methodFunction: function. Extract the sealed function.

Note

Updated 2021-08-13.

See also

• Modified version of John Chambers' code.

• help(topic = "MethodDefinition-class", package = "methods").

• methods::selectMethod().

• methods::setMethod().

Examples

## Function ====
x <- methodFunction(
    f = "show",
    signature = "ANY",
    package = "methods"
)
class(x)
#> [1] "function"
body(x)
#> showDefault(object)

## Formals ====
x <- methodFormals(
    f = "show",
    signature = "ANY",
    package = "methods"
)
class(x)
#> [1] "pairlist"
print(x)
#> $object
#> 
#>