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// -*- mode: C++; c-indent-level: 4; c-basic-offset: 4; tab-width: 8 -*-
//
// unary_minus.h: Rcpp R/C++ interface class library -- unary operator-
//
// 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__sugar__unary_minus_h
#define Rcpp__sugar__unary_minus_h
namespace Rcpp{
namespace sugar{
template <int RTYPE>
struct unary_minus_result_type{
typedef typename traits::storage_type<RTYPE>::type type ;
enum{ value = RTYPE } ;
} ;
template <>
struct unary_minus_result_type<LGLSXP>{
typedef traits::storage_type<INTSXP>::type type ;
enum{ value = INTSXP } ;
} ;
template <int RTYPE,bool NA>
class unary_minus {
public:
typedef typename traits::storage_type<RTYPE>::type STORAGE ;
typedef typename unary_minus_result_type<RTYPE>::type RESULT ;
inline RESULT apply( STORAGE x ) const {
return Rcpp::traits::is_na<RTYPE>(x) ? x : ( -x ) ;
}
} ;
template <int RTYPE>
class unary_minus<RTYPE,false> {
public:
typedef typename Rcpp::traits::storage_type<RTYPE>::type STORAGE ;
typedef typename unary_minus_result_type<RTYPE>::type RESULT ;
inline RESULT apply( STORAGE x ) const {
return -x ;
}
} ;
template <bool NA>
class unary_minus<CPLXSXP,NA>{
public:
inline Rcomplex apply( Rcomplex x ) const {
if (Rcpp::traits::is_na<CPLXSXP>( x ) ) return x;
Rcomplex cx ;
cx.r = -x.r;
cx.i = -x.i ;
return cx ;
}
} ;
template <>
class unary_minus<CPLXSXP,false>{
public:
inline Rcomplex apply( Rcomplex x ) const {
Rcomplex cx ;
cx.r = -x.r;
cx.i = -x.i ;
return cx ;
}
} ;
template <int RTYPE, bool NA, typename T>
class UnaryMinus_Vector : public Rcpp::VectorBase<
unary_minus_result_type<RTYPE>::value ,
NA,
UnaryMinus_Vector< unary_minus_result_type<RTYPE>::value ,NA,T>
> {
public:
typedef typename Rcpp::VectorBase<RTYPE,NA,T> VEC_TYPE ;
typedef typename traits::storage_type<RTYPE>::type STORAGE ;
typedef typename unary_minus_result_type<RTYPE>::type RESULT ;
typedef unary_minus<RTYPE,NA> OPERATOR ;
UnaryMinus_Vector( const VEC_TYPE& lhs_ ) :
lhs(lhs_), op() {}
inline RESULT operator[]( R_xlen_t i ) const {
return op.apply( lhs[i] ) ;
}
inline R_xlen_t size() const { return lhs.size() ; }
private:
const VEC_TYPE& lhs ;
OPERATOR op ;
} ;
}
}
template <int RTYPE,bool NA, typename T>
inline Rcpp::sugar::UnaryMinus_Vector< RTYPE , NA , T >
operator-(
const Rcpp::VectorBase<RTYPE,NA,T>& x
) {
return Rcpp::sugar::UnaryMinus_Vector<RTYPE,NA, T >( x ) ;
}
#endif
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