R: Inheritance-style lookup of function from within a closure.

Inheritance-style lookup of function from within a closure.

Usage

super(fun)

Arguments

fun the name of the function we are looking for

Description

Finds a function in ancestor environments of the current one, so that we can avoid local defintions. This is used in the CORBA facilities within a closure when we provide a local function with an implicit this. Then we use super to find the real function and supply it the explicit this.

Details

Value

a function definition for the specified name.

Author(s)

Duncan Temple Lang, Ross Ihaka

Examples

   # define a closure.
 cl <- function(this) {
      # define a local nrow which calls the global one.
    nrow <- function() {
      super(nrow)(this)
    }
    return(list(nrow=nrow))
 }
  # create a closure from the generator
 mobj <- cl(matrix(1:9,3,3))

  # call the closure's nrow() function
 mobj$nrow()

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