[Rd] S4SXP type vs S4 object bit?

[Travers Ching]

Thanks you Jiefei and Michael!

Travers

On Tue, Oct 22, 2019 at 8:14 AM Wang Jiefei <szwjf08 using gmail.com> wrote:

> Hi Travers,
>
> Just an additional remarks to Michael's answer, if your S4 class inherits
> from R's basic types, say integer, the resulting object will be an INTSXP.
> If your S4 class does not inherit from any class, it will be an S4SXP. You
> can think about this question from the object-oriented framework: If one
> class inherits the integer class, what should R do to make all the integer
> related functions compatible with the new class at C level?
>
> Best,
> Jiefei
>
> On Tue, Oct 22, 2019 at 4:28 AM Travers Ching <traversc using gmail.com> wrote:
>
>> I'm trying to understand the R internals a bit better and reading over the
>> documentation.
>>
>> I see that there is a bit related to whether an object is S4
>> (S4_OBJECT_MASK), and also the object type S4SXP (25).  The documentation
>> makes clear that these two things aren't the same.
>>
>> But in practice, will the S4-bit and object type ever disagree for S4
>> objects?  I know that one can set the bit manually in C; are there any
>> practical applications for doing so?
>>
>> Thank you
>> Travers
>>
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>>
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>

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