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// -*- mode: C++; c-indent-level: 4; c-basic-offset: 4; tab-width: 8 -*-
/* :tabSize=4:indentSize=4:noTabs=false:folding=explicit:collapseFolds=1: */
//
// r_vector.h: Rcpp R/C++ interface class library -- information about R vectors
//
// Copyright (C) 2010 - 2013 Dirk Eddelbuettel and Romain Francois
//
// This file is part of Rcpp.
//
// Rcpp is free software: you can redistribute it and/or modify it
// under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 2 of the License, or
// (at your option) any later version.
//
// Rcpp is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Rcpp. If not, see <http://www.gnu.org/licenses/>.
#ifndef Rcpp__internal__r_vector_h
#define Rcpp__internal__r_vector_h
namespace Rcpp{
namespace internal{
template <int RTYPE>
typename Rcpp::traits::storage_type<RTYPE>::type* r_vector_start(SEXP x){
typedef typename Rcpp::traits::storage_type<RTYPE>::type* pointer ;
return reinterpret_cast<pointer>( dataptr(x) ) ;
}
/**
* The value 0 statically casted to the appropriate type for
* the given SEXP type
*/
template <int RTYPE,typename CTYPE>
inline CTYPE get_zero(){
return static_cast<CTYPE>(0) ;
}
/**
* Specialization for Rcomplex
*/
template<>
inline Rcomplex get_zero<CPLXSXP,Rcomplex>(){
Rcomplex x ;
x.r = 0.0 ;
x.i = 0.0 ;
return x ;
}
/**
* Initializes a vector of the given SEXP type. The template fills the
* vector with the value 0 of the appropriate type, for example
* an INTSXP vector is initialized with (int)0, etc...
*/
template<int RTYPE> void r_init_vector(SEXP x){
typedef typename ::Rcpp::traits::storage_type<RTYPE>::type CTYPE ;
CTYPE* start=r_vector_start<RTYPE>(x) ;
std::fill( start, start + Rf_length(x), get_zero<RTYPE,CTYPE>() ) ;
}
/**
* Initializes a generic vector (VECSXP). Does nothing since
* R already initializes all elements to NULL
*/
template<>
inline void r_init_vector<VECSXP>(SEXP x){}
/**
* Initializes an expression vector (EXPRSXP). Does nothing since
* R already initializes all elements to NULL
*/
template<>
inline void r_init_vector<EXPRSXP>(SEXP x){}
/**
* Initializes a character vector (STRSXP). Does nothing since
* R already initializes all elements to ""
*/
template<>
inline void r_init_vector<STRSXP>(SEXP x){}
} // internal
} // Rcpp
#endif
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