standardGeneric initiates dispatch of S4
methods: see the references and the documentation of the
methods package. Usually, calls to this function are
generated automatically and not explicitly by the programmer.
standardGeneric dispatches the method defined for a generic
f, using the actual arguments in the frame from which
it is called.
fdef is inserted (automatically) when dispatching
methods for a primitive function. If present, it must always be the function
definition for the corresponding generic. Don't insert this argument
by hand, as there is no validity checking and miss-specifying the
function definition will cause certain failure.
For more, use the methods package, and see the documentation in
Chambers, John M. (2008) Software for Data Analysis: Programming with R Springer. (For the R version.)
Chambers, John M. (1998) Programming with Data Springer (For the original S4 version.)