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% File src/library/base/man/zMethods.Rd
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% Part of the R package, http://www.R-project.org
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% Copyright 1995-2007 R Core Team
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% Distributed under GPL 2 or later
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\name{InternalMethods}
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\alias{InternalMethods}
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\alias{InternalGenerics}
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\alias{internal generic}
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\alias{.S3PrimitiveGenerics}
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\title{Internal Generic Functions}
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\description{
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  Many \R-internal functions are \emph{generic} and allow
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  methods to be written for.
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}
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  % -------------------- grep -nw DispatchOrEval src/*/*[ch]
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  %                         --------------
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\details{
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  The following primitive and internal functions are \emph{generic},
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  i.e., you can write \code{\link{methods}} for them:
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  \code{\link{[}},%            % do_subset()         [subset.c]
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  \code{\link{[[}},%           % do_subset2()        [subset.c]
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  \code{\link{$}},
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  \code{\link{[<-}},
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  \code{\link{[[<-}},
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  \code{\link{$<-}},
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  \code{\link{length}},%      % do_length()          [array.c]
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  \code{\link{length<-}},%    % do_lengthgets()      [builtin.c]
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  \code{\link{dimnames}},%    % do_dimnames()        [attrib.c]
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  \code{\link{dimnames<-}},%  % do_dimnamesgets()    [attrib.c]
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  \code{\link{dim}},%         % do_dim()             [attrib.c]
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  \code{\link{dim<-}},%       % do_dimgets()         [attrib.c]
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  \code{\link{names}},%       % do_names()           [attrib.c]
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  \code{\link{names<-}},%     % do_namesgets()       [attrib.c]
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  \code{\link{levels<-}},%    % do_levelsgets()      [attrib.c]
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  \code{\link{c}},%           % do_c()               [bind.c]
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  \code{\link{unlist}},%      % do_unlist()          [bind.c]
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  \code{\link{cbind}},%       not via DispatchOrEval [bind.c]
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  \code{\link{rbind}},
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  \code{\link{as.character}},
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  \code{\link{as.complex}},
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  \code{\link{as.double}},
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  \code{\link{as.integer}},
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  \code{\link{as.logical}},
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  \code{\link{as.raw}},
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  \code{\link{as.vector}},%   % do_asvector()        [coerce.c]
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  \code{\link{is.array}},
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  \code{\link{is.matrix}},
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  \code{\link{is.na}},%       % do_isna()            [coerce.c]
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  \code{\link{is.nan}},%      % do_isnan()           [coerce.c]
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  \code{\link{is.numeric}},
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  \code{\link{rep}},%                                [seq.c]
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  \code{\link{seq.int}}
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  (which dispatches methods for \code{"seq"})%       [seq.c]
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  and \code{\link{xtfrm}}%                           [sort.c]
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  In addition, \code{is.name} is a synonym for \code{is.symbol} and
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  dispatches methods for the latter.
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  Note that all of the \link{group generic} functions are also
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  internal/primitive and allow methods to be written for them.
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  \code{.S3PrimitiveGenerics} is a character vector listing the
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  primitives which are internal generic and not \link{group generic}.
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  Currently \code{\link{as.vector}}, \code{\link{cbind}},
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  \code{\link{rbind}} and \code{\link{unlist}} are the internal
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  non-primitive functions which are internally generic.
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  For efficiency, internal dispatch only occurs on \emph{objects}, that
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  is those for which \code{\link{is.object}} returns true.
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}
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\seealso{
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  \code{\link{methods}} for the methods which are available.
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}
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\keyword{methods}