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\name{InternalMethods}
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\alias{InternalMethods}
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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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\details{
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  % -------------------- grep -nw DispatchOrEval src/*/*[ch]
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  %                         --------------
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  The following builtin functions are \emph{generic} as well, i.e., you
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  can write \code{\link[utils]{methods}} for them:
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  \code{\link{[}},            % do_subset()          [subset.c:464]
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  \code{\link{[[}},           % do_subset2()         [subset.c:567]
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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}},
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  \code{\link{dimnames<-}},   % do_dimnamesgets()    [attrib.c:422]
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  \code{\link{dimnames}},     % do_dimnames()        [attrib.c:489]
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  \code{\link{dim<-}},        % do_dimgets()         [attrib.c:513]
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  \code{\link{dim}}           % do_dim()             [attrib.c:501]
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  \code{\link{c}},            % do_c()               [bind.c:524]
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  \code{\link{unlist}},       % do_unlist()          [bind.c:648]
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  \code{\link{as.character}},
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  \code{\link{as.vector}},    % do_asvector()        [coerce.c:948]
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  \code{\link{is.array}},
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  \code{\link{is.atomic}},
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  \code{\link{is.call}},
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  \code{\link{is.character}},
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  \code{\link{is.complex}},
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  \code{\link{is.double}},
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  \code{\link{is.environment}},
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  \code{\link{is.function}},
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  \code{\link{is.integer}},
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  \code{\link{is.language}},
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  \code{\link{is.logical}},
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  \code{\link{is.list}},
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  \code{\link{is.matrix}},
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  \code{\link{is.na}},        % do_isna()            [coerce.c:1244]
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  \code{\link{is.nan}}        % do_isnan()           [coerce.c:1332]
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  \code{\link{is.null}},
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  \code{\link{is.numeric}},
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  \code{\link{is.object}},
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  \code{\link{is.pairlist}},
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  \code{\link{is.recursive}},
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  \code{\link{is.single}},
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  \code{\link{is.symbol}}.
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}
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\seealso{
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  \code{\link[utils]{methods}} for the methods of non-Internal generic functions.
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}
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\keyword{methods}