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\alias{function-class}
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\alias{function-class}
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\alias{ANY-class}
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\alias{ANY-class}
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\alias{VIRTUAL-class}
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\alias{VIRTUAL-class}
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\alias{missing-class}
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\alias{missing-class}
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\title{Classes Corresponding to Basic Data Types }
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\title{Classes Corresponding to Basic Data Types }
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\description{
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\description{  Formal classes exist corresponding to the basic R data
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  Formal classes exist corresponding to the basic R data types, allowing
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  types, allowing these types to be used in method signatures, as slots
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  these types to be used in method signatures, as slots in class
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  in class definitions, and to be
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  extended by new classes. }
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  definitions, and to be extended by new classes.}
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\usage{
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\usage{
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### The following are all basic vector classes.
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### The following are all basic vector classes.
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### They can appear as class names in method signatures,
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### They can appear as class names in method signatures,
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### in calls to as(), is(), and new().
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### in calls to as(), is(), and new().
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"character"
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"character"
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"externalptr" # raw external pointers for use in C code
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"externalptr" # raw external pointers for use in C code
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"ANY"  # virtual classes used by the methods package itself
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"ANY"  # virtual classes used by the methods package itself
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"VIRTUAL"
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"VIRTUAL"
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"missing"
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"missing"
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}
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}
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\section{Objects from the Classes}{
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\section{Objects from the Classes}{
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Objects can be created by calls of the form \code{new(Class, ...)},
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  Objects can be created by calls of the form \code{new(Class, ...)},
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where \code{Class} is the quoted class name, and the remaining arguments
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  where \code{Class} is the quoted class name, and the remaining
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if any are objects to be interpreted as vectors of this class.  Multiple
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  arguments if any are objects to be interpreted as vectors of this
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arguments will be concatenated.
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  class.  Multiple arguments will be concatenated.
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The class \code{"expression"} is slightly odd, in that the \dots
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  The class \code{"expression"} is slightly odd, in that the \dots
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arguments will \emph{not} be evaluated; therefore, don't enclose them in
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  arguments will \emph{not} be evaluated; therefore, don't enclose them
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a call to \code{quote()}.
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  in a call to \code{quote()}.
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}
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}
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\section{Extends}{
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\section{Extends}{
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Class \code{"vector"}, directly.
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  Class \code{"vector"}, directly.
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}
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}
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\section{Methods}{
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\section{Methods}{
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  \describe{
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  \describe{
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    \item{coerce}{Methods are defined to coerce arbitrary objects to
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    \item{coerce}{Methods are defined to coerce arbitrary objects to
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      these classes, by calling the corresponding basic function, for
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      these classes, by calling the corresponding basic function, for