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// -*- mode: C++; c-indent-level: 4; c-basic-offset: 4; tab-width: 8 -*-
//
// RangeIndexer.h: Rcpp R/C++ interface class library --
//
// Copyright (C) 2010 - 2011 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__vector__RangeIndexer_h
#define Rcpp__vector__RangeIndexer_h
#define UNROLL_LOOP(OP) \
typedef typename ::Rcpp::traits::Extractor<RTYPE,NA,T>::type EXT ; \
const EXT& input( x.get_ref() ) ; \
int __trip_count = (size_) >> 2; \
int i=0 ; \
for ( ; __trip_count > 0 ; --__trip_count) { \
start[i] OP input[i] ; i++ ; \
start[i] OP input[i] ; i++ ; \
start[i] OP input[i] ; i++ ; \
start[i] OP input[i] ; i++ ; \
} \
switch (size_ - i){ \
case 3: \
start[i] OP input[i] ; i++ ; \
case 2: \
start[i] OP input[i] ; i++ ; \
case 1: \
start[i] OP input[i] ; i++ ; \
case 0: \
default: \
return *this ; \
}
namespace Rcpp{
namespace internal{
template <int RTYPE, bool NA, typename VECTOR>
class RangeIndexer : public VectorBase<RTYPE, NA, RangeIndexer<RTYPE,NA,VECTOR> > {
public:
typedef typename VECTOR::Proxy Proxy ;
typedef typename VECTOR::iterator iterator ;
RangeIndexer( VECTOR& vec_, const Rcpp::Range& range_) :
start(vec_.begin() + range_.get_start() ), size_( range_.size() ) {}
template <bool NA_, typename T>
RangeIndexer& operator=( const Rcpp::VectorBase<RTYPE,NA_,T>& x){
UNROLL_LOOP(=)
}
template <bool NA_, typename T>
RangeIndexer& operator+=( const Rcpp::VectorBase<RTYPE,NA_,T>& x){
UNROLL_LOOP(+=)
}
template <bool NA_, typename T>
RangeIndexer& operator*=( const Rcpp::VectorBase<RTYPE,NA_,T>& x){
UNROLL_LOOP(*=)
}
template <bool NA_, typename T>
RangeIndexer& operator-=( const Rcpp::VectorBase<RTYPE,NA_,T>& x){
UNROLL_LOOP(-=)
}
template <bool NA_, typename T>
RangeIndexer& operator/=( const Rcpp::VectorBase<RTYPE,NA_,T>& x){
UNROLL_LOOP(/=)
}
inline Proxy operator[]( R_xlen_t i ) const {
return start[i] ;
}
inline R_xlen_t size() const {
return size_ ;
}
private:
iterator start ;
R_xlen_t size_ ;
} ;
}
}
#undef UNROLL_LOOP
#endif
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