R How to call '[.class<-' directly -


out of curiosity, how call '[.class' function in r directly?

i know can do:

test <- c(2,4,6) test[2]

but possible specify class directly? , if so, how? 

'[.numeric<-'(test , 2) '[.numeric'(test , 2)

i have tried these come 

error: not find function "[.numeric"

[ internal generic, means dispatch occurs in c, , base types (like numeric) don't have s3 methods in r. that's why there's no [.numeric or [<-.numeric.

it's not clear want, example, can do

test <- 1:3 `[`(test, 2) `[<-`(test, 2, 3)

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