s3_dispatch | R Documentation |
s3_dispatch()
prints a list of all possible function names that will be
considered for method dispatch. There are four possible states:
=>
method exists and is found by UseMethod()
.
->
method exists and is used by NextMethod()
.
*
method exists but is not used.
Nothing (and greyed out in console): method does not exist.
Learn more at https://adv-r.hadley.nz/s3.html.
s3_dispatch(call, env = parent.frame())
call |
Example call to S3 method |
env |
Environment in which to evaluate call |
x <- Sys.time()
s3_dispatch(print(x))
s3_dispatch(is.numeric(x))
s3_dispatch(as.Date(x))
s3_dispatch(sum(x))
# Internal vs. regular generic
x1 <- 1
x2 <- structure(2, class = "double")
my_length <- function(x) UseMethod("my_length")
s3_dispatch(my_length(x1))
s3_dispatch(my_length(x2))
length.double <- function(x) 10
s3_dispatch(length(x1))
s3_dispatch(length(x2))
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