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// -*- mode: C++; c-indent-level: 4; c-basic-offset: 4; indent-tabs-mode: nil; -*-
//
// MatrixColumn.h: Rcpp R/C++ interface class library -- matrices column
//
// 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__vector__MatrixColumn_h
#define Rcpp__vector__MatrixColumn_h
namespace Rcpp{
template <int RTYPE>
class MatrixColumn : public VectorBase<RTYPE,true,MatrixColumn<RTYPE> > {
public:
typedef Matrix<RTYPE> MATRIX ;
typedef typename MATRIX::Proxy Proxy ;
typedef typename MATRIX::const_Proxy const_Proxy ;
typedef typename MATRIX::value_type value_type ;
typedef typename MATRIX::iterator iterator ;
typedef typename MATRIX::const_iterator const_iterator ;
MatrixColumn( MATRIX& parent, int i ) :
n(parent.nrow()),
start(parent.begin() + static_cast<R_xlen_t>(i) * n ),
const_start(const_cast<const MATRIX&>(parent).begin() + static_cast<R_xlen_t>(i) * n)
{
if( i < 0 || i >= parent.ncol() ) {
const char* fmt = "Column index is out of bounds: "
"[index=%i; column extent=%i].";
throw index_out_of_bounds(fmt, i, parent.ncol()) ;
}
}
MatrixColumn( const MATRIX& parent, int i ) :
n(parent.nrow()),
start( const_cast<MATRIX&>(parent).begin() + static_cast<R_xlen_t>(i) * n ),
const_start(parent.begin() + static_cast<R_xlen_t>(i) * n)
{
if( i < 0 || i >= parent.ncol() ) {
const char* fmt = "Column index is out of bounds: "
"[index=%i; column extent=%i].";
throw index_out_of_bounds(fmt, i, parent.ncol()) ;
}
}
MatrixColumn( const MatrixColumn& other ) :
n(other.n),
start(other.start),
const_start(other.const_start) {}
template <int RT, bool NA, typename T>
MatrixColumn& operator=( const Rcpp::VectorBase<RT,NA,T>& rhs ){
const T& ref = rhs.get_ref() ;
RCPP_LOOP_UNROLL(start,ref)
return *this ;
}
MatrixColumn& operator=( const MatrixColumn& rhs ){
iterator rhs_start = rhs.start ;
RCPP_LOOP_UNROLL(start,rhs_start)
return *this ;
}
inline Proxy operator[]( int i ){
return start[i] ;
}
inline const_Proxy operator[]( int i ) const {
return const_start[i] ;
}
inline const_iterator begin() const {
return const_start ;
}
inline const_iterator end() const {
return const_start + n ;
}
inline const_iterator cbegin() const {
return const_start ;
}
inline const_iterator cend() const {
return const_start + n ;
}
inline iterator begin(){
return start ;
}
inline iterator end(){
return start + n ;
}
inline int size() const {
return n ;
}
private:
const int n ;
iterator start ;
const_iterator const_start ;
} ;
template <int RTYPE>
class ConstMatrixColumn : public VectorBase<RTYPE,true,ConstMatrixColumn<RTYPE> > {
public:
typedef Matrix<RTYPE> MATRIX ;
typedef typename MATRIX::const_Proxy const_Proxy ;
typedef typename MATRIX::value_type value_type ;
typedef typename MATRIX::const_iterator const_iterator ;
ConstMatrixColumn( const MATRIX& parent, int i ) :
n(parent.nrow()),
const_start(parent.begin() + static_cast<R_xlen_t>(i) * n)
{
if( i < 0 || i >= parent.ncol() ) {
const char* fmt = "Column index is out of bounds: "
"[index=%i; column extent=%i].";
throw index_out_of_bounds(fmt, i, parent.ncol()) ;
}
}
ConstMatrixColumn( const ConstMatrixColumn& other ) :
n(other.n),
const_start(other.const_start) {}
inline const_Proxy operator[]( int i ) const {
return const_start[i] ;
}
inline const_iterator begin() const {
return const_start ;
}
inline const_iterator end() const {
return const_start + n ;
}
inline const_iterator cbegin() const {
return const_start ;
}
inline const_iterator cend() const {
return const_start + n ;
}
inline int size() const {
return n ;
}
private:
const int n ;
const_iterator const_start ;
} ;
}
#endif
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