[Rcpp-devel] Odd-seeming behaviour of [[ and $

[North, Ben]

Hi Romain,

Thanks for the reply.

> > The fact that 'x[["value"]]' finds the method only if I've first done
> > 'x$value' seemed odd.
>
> This is an implementation artefact. In short, you are not supposed to
> use [[.

OK, fair enough :)

Because `$` doesn't evaluate its field-name argument, is

    field.name <- "value"
    do.call(`$`, list(x, field.name))

the recommended way of accessing methods whose names are computed at
run-time?  It does work; just wondering if there's a better way.

Thanks,

Ben.


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