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}
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}
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\value{
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\value{
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  Function \code{implicitGeneric()} returns the implicit generic
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  Function \code{implicitGeneric()} returns the implicit generic
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  definition (and caches that definition the first time if it has to
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  definition (and caches that definition the first time if it has to
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  construct it).
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  construct it).
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  The other functions exist for their side effect and return nothing
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  The other functions exist for their side effect and return nothing
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  useful.
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  useful.
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}
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}
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\seealso{\code{\link{setGeneric}}}
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\seealso{\code{\link{setGeneric}}}
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\examples{
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\examples{
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### How we would make the function \link{with}() into a generic:
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## Since the second argument, 'expr' is used literally, we want
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## with() to only have "data" in the signature.
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## Note that 'methods'-internal code now has already extended  with()
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## to do the equivalent of the following
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\dontrun{
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\dontrun{
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### How we would make the function \link{with}() into a generic
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### The second argument is used literally, so we want it to have
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### only "data" in the signature.
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setGeneric("with", signature = "data")
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setGeneric("with", signature = "data")
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### Now we could predefine methods for "with" if we wanted to.
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## Now we could predefine methods for "with" if we wanted to.
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### When ready, we store the generic as implicit,
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## When ready, we store the generic as implicit, and restore the original
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### and restore the original
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setGenericImplicit("with")
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setGenericImplicit("with")
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### (This example would only work if we "owned" function with(),
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## (This example would only work if we "owned" function with(),
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### but it is in base.)}
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##  but it is in base.)}
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implicitGeneric("with")
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implicitGeneric("with")
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}
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}
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\keyword{programming}
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\keyword{programming}
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\keyword{methods}
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\keyword{methods}