[Rcpp-devel] Dispatching based on SEXPTYPE

[romain at r-enthusiasts.com]

We'll probably have something similar in Rcpp at some point.

Le 2012-11-26 21:52, Davor Cubranic a écrit :
> Is this macro intended to be used in other, similar contexts?
> Otherwise, why not have "switch" inside unique2, as in Hadley's
> original code?
>
> Davor
>
>
> On 2012-11-22, at 7:25 AM, Hadley Wickham wrote:
>
>>> #define DISPATCH_METHOD(method, x)  \
>>>  switch( TYPEOF(x) ){          \
>>>    case REALSXP:                   \
>>>      return method<REALSXP>(x);    \
>>>    case INTSXP:                    \
>>>      return method<INTSXP>(x);     \
>>>    case STRSXP:                    \
>>>      return method<STRSXP>(x);     \
>>>    case LGLSXP:                    \
>>>      return method<LGLSXP>(x);     \
>>>    default:                        \
>>>      Rf_error("Unsupported type"); \
>>>      return x;                     \
>>>  }
>>
>> Why do we need a macro here? Is it not possible to pass in method as 
>> a
>> function?  It seems like there must be a more elegant way to do
>> dynamic dispatch.
>>
>> Hadley
>>
>>
>> --
>> RStudio / Rice University
>> http://had.co.nz/
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