InternalMethods             package:base             R Documentation

Internal Generic Functions

Description:

     Many R-internal functions are _generic_ and allow methods to be
     written for.

Details:

     The following primitive and internal functions are _generic_,
     i.e., you can write 'methods' for them:

     '[', '[[', '$', '[<-', '[[<-', '$<-',

     'length', 'length<-',

     'dimnames<-', 'dimnames', 'dim<-', 'dim',

     'c', 'unlist',

     'as.character', 'as.vector', 'is.array', 'is.atomic', 'is.call',
     'is.character', 'is.complex', 'is.double', 'is.environment',
     'is.function', 'is.integer', 'is.language', 'is.logical',
     'is.list', 'is.matrix', 'is.na', 'is.nan', 'is.null',
     'is.numeric', 'is.object', 'is.pairlist', 'is.recursive',
     'is.single', 'is.symbol', 'rep' and 'seq.int'.

     Note that most of the group generic functions are also
     internal/primitive and allow methods to be written for them.

See Also:

     'methods' for the methods of non-Internal generic functions.

