[Rd] Defining a `show` function breaks the print-ing of S4 object -- bug or expected?

[luke-tierney at uiowa.edu]

Same thing happens with S3 if you redefine print(). I thought that
code was actually calculating the function to call rather than the
symbol to use, but apparently not. Shouldn't be too hard to fix.

luke

On Tue, 30 Jun 2015, Hadley Wickham wrote:

> On Tue, Jun 30, 2015 at 2:20 PM, Duncan Murdoch
> <murdoch.duncan at gmail.com> wrote:
>> On 30/06/2015 1:57 PM, Hadley Wickham wrote:
>>> A slightly simpler formulation of the problem is:
>>>
>>> show <- function(...) stop("My show!")
>>> methods::setClass("Person", slots = list(name = "character"))
>>> methods::new("Person", name = "Tom")
>>> #> Error in (function (...)  : My show!
>>
>> Just to be clear:  the complaint is that the auto-called show() is not
>> methods::show?  I.e. after
>>
>> x <- methods::new("Person", name = "Tom")
>>
>> you would expect
>>
>> show(x)
>>
>> to give the error, but not
>>
>> x
>>
>> ??
>
> Correct - I'd expect print() to always call methods::show(), not
> whatever show() is first on the search path.
>
> Hadley
>
>

-- 
Luke Tierney
Ralph E. Wareham Professor of Mathematical Sciences
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