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% File src/library/methods/man/methods-package.Rd
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% Part of the R package, https://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{methods-package}
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\alias{methods-package}
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\docType{package}
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\title{
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Formal Methods and Classes
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}
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\description{
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Formally defined methods and classes for R objects, plus
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other programming tools, as described in the references.
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}
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\details{
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  This package provides the \dQuote{S4} or \dQuote{S version 4}
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  approach to methods and classes in a functional language.
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  For basic use of the techniques, start with \link{Introduction} and
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  follow the links there to the key functions for programming, notably
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  \code{\link{setClass}} and \code{\link{setMethod}}.
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  Some specific topics:
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\describe{
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    \item{Classes:}{ Creating one, see \code{\link{setClass}};
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        examining definitions, see \code{\link{getClassDef}} and
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        \linkS4class{classRepresentation}; inheritance and coercing,
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      see \code{\link{is}} and \code{\link{as}}
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      }
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  \item{Generic functions:}{  Basic programming, see
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      \code{\link{setGeneric}}; the class of objects, see
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      \linkS4class{genericFunction}; other functions to examine or
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      manipulate them, see \link{GenericFunctions}.
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      }
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   \item{S3:}{Using classes, see \code{\link{setOldClass}}; methods,
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       see \link{Methods_for_S3}.
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     }
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     \item{Reference classes:}{See \link{ReferenceClasses}.
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         }
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    \item{Class unions; virtual classes}{See \code{\link{setClassUnion}}.
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         }
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}
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These pages will have additional links to related topics.
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  For a complete
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  list of functions and classes, use \code{library(help="methods")}.
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}
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\references{
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 Chambers, John M. (2016)
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 \emph{Extending R},
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  Chapman & Hall.
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(Chapters 9 and 10.)
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 Chambers, John M. (2008)
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 \emph{Software for Data Analysis: Programming with R}
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  Springer.  (Chapter 10 has some additional details.)
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}
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\author{
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R Core Team
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Maintainer: R Core Team \email{R-core@r-project.org}
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}
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\keyword{ package }
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\keyword{ methods }