On Fri, Mar 21, 2014 at 6:27 PM, Gábor Csárdi <csardi.ga...@gmail.com>wrote:
> On Fri, Mar 21, 2014 at 12:40 PM, Karl Forner <karl.for...@gmail.com>wrote:
> [...]
>
>> Hmm, what if your package depends on packages A and B, and that A depends
>> on C v1.0 and B depends on C v1.1 ? This is just an example but I imagine
>> that will lead to a lot of complexities.
>>
>
> You'll have to be able to load (but not attach, of course!) multiple
> versions of the same package at the same time. The search paths are set up
> so that A imports v1.0 of C, B imports v1.1. This is possible to support
> with R's namespaces and imports mechanisms, I believe.
>
not really: I think there are still cases (unfortunately) where you have to
use depends, e.g. when defining S4 methods for classes implemented in other
packages.
But my point is that you would need really really smart tools, AND to be
able to install precise versions of packages.
> It requires quite some work, though, so I am obviously not saying to
> switch to it tomorrow. Having a CRAN-devel seems simpler.
>
Indeed.
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