[Rcpp-devel] __ambiguous_overload_for_‘operator[]’

[Kaveh Vakili]

thanks,



>You're mixing NumericVectors, std::vectors, and XPtrs, not to mention using plain C's memcpy to copy C++ objects. Even if it compiled, I'd be surprised if 
this code worked correctly. 
>
>If you want to copy pdA into v, you should probably use std::copy with iterators (with v as the target, not pdB). Telling v's constructor the size to pre-allocate would be good, too.
>
>Davor
>
>
>On 2010-10-27, at 3:22 PM, Kaveh Vakili wrote:
>
>> trying to feed the beast something line by line (if this works to the end it may become an instance of quickselect() :)
>> 
>> 
>> 	int k = Rcpp::as<int>(kr);  
>> 	NumericVector pdA(pdAr);
>> 	int n = pdA.size();
>> 	//this: 
>> 	//double *pdB = new double [n] ;	
>> 	//becomes this?
>> 	std::vector<double>* v = new std::vector<double>;
>> 	Rcpp::XPtr< std::vector<double> > pdB(v) ;
>> 	
>> 	double dAx, dBuffer ;		
>> 	int l = 0, lr = n - 1, jnc, j ;
>> 
>> 	memcpy (pdB, pdA, n * sizeof (double)) ;
>> 
>> 	while (l < lr){
>> 		dAx = pdB[k];
>> 
>> 
>> This last line gives: 
>> 
>> 
>> filef9889ff.cpp:45: error: ambiguous overload for ‘operator[]’ in ‘pdB[k]’
>> 
>> 
>> Also, i patched together the piece i found on the examples/tests so fare..probably a strange patchwork for you :)
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>
>
>