[Rcpp-devel] ambiguous overload for ‘operator[]’

[Davor Cubranic]

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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