funDispatch: find dispatched functions for an object

In paodan/funcTools: some useful function tools in practice

find dispatched functions for an object

Description

find dispatched functions for an object

Usage

funDispatch(f, object, envir = topenv(parent.frame()))

Arguments

f	function name.
object	the object that the function f is processing
envir	the working environment

Value

a list of two elements: S3 and S4, which list all methods that can be dispatched for S3 and S4 objects, respectively. NULL in S3 element means no method is found for this function by treating the "object" as an S3 object. And similar to NULL in S4 element. If both S3 and S4 elements are NULL, the function f appears not to be either S3 generic or S4 generic, and the original function without dispatching is applied. The function f can be an alias of another generic function, the attribute "name" of the result is the very original generic function name.

Examples

## Not run: 
funDispatch(f = "print", object = "asdf") #ls.default
funDispatch("print", object = ~ a + b) #ls.formula

funDispatch("lm", object = ~ a + b) #lm itself

funDispatch("show", object = "asdf") # S4 "ANY"
funDispatch(show, object = "asdf") # S4 "ANY"

x = show
funDispatch(x, object = "asdf") # S4 "ANY"
funDispatch("x", object = "asdf") # S4 "ANY"

y = "show"
funDispatch(y, object = "asdf") # S4 "ANY"
funDispatch("y", object = "asdf") # Not found

funDispatch("ls", object = .GlobalEnv) # itself

x = ls
y = "ls"
funDispatch(x, object = .GlobalEnv) # itself
funDispatch(y, object = .GlobalEnv) # itself

## End(Not run)

paodan/funcTools documentation built on April 1, 2024, 12:01 a.m.