acast and dcast are generics with data.frame method.

[arunsrinivasan]

• cast is not exported.
• acast.data.frame and dcast.data.frame are documented (material from cast).
• ?acast and ?dcast redirect to the .data.frame methods (created an alias).
• Examples are split from cast.
• check() runs without any warnings/errors.
• dev_help("cast") doesn't work anymore (as expected).

[arunsrinivasan]

Are there still plans to make reshape2::dcast S3 generic?

[hadley]

I'll look into it the next time I'm working on reshape2, but that's likely to be a while.