[Rd] Class generator functions for reference classes

[Hadley Wickham]

> As of rev. 61035 in r-devel, setRefClass() now returns a generator function,
> as setClass() has done since 2.15.0.
>
> The convenient style is now:
>   mEdit <- setRefClass("mEdit",......)
>   xx <- mEdit(data = xMat)
>
> instead of
>   xx <- mEdit$new(data = xMat)
>
> The returned object still has fields and methods accessible as before.

Similarly, would it be possible for setGeneric and setMethod to return
the equivalent generic and method objects?

Hadley

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RStudio / Rice University
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