not.h

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// -*- mode: C++; c-indent-level: 4; c-basic-offset: 4; tab-width: 8 -*-
//
// not.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__not_h
#define Rcpp__sugar__not_h

namespace Rcpp{
namespace sugar{

        template <int RTYPE,bool NA> 
        class not_ {
        public:
                typedef typename traits::storage_type<RTYPE>::type STORAGE ;
                inline int apply( STORAGE x ) const {
                        return Rcpp::traits::is_na<RTYPE>(x) ? NA_LOGICAL : (x ? FALSE : TRUE) ;
                }
        } ;
        template <int RTYPE>
        class not_<RTYPE,false> {
        public:
                typedef typename Rcpp::traits::storage_type<RTYPE>::type STORAGE ;
                inline int apply( STORAGE x ) const {
                        return x ? FALSE : TRUE ;
                }
        } ;
        template <bool NA>
        class not_<REALSXP,NA>{
        public:
                inline int apply( double x ) const {
                        return Rcpp::traits::is_na<REALSXP>( x ) ? NA_LOGICAL : ( (x == 0) ? FALSE : TRUE ) ;
                }
        } ;
        template <>
        class not_<REALSXP,false>{
        public:
                inline int apply( double x ) const {
                        return ( x == 0.0 ? FALSE : TRUE ) ;
                }
        } ;
        template <bool NA>
        class not_<CPLXSXP,NA>{
        public:
                inline int apply( Rcomplex x ) const {
                        return Rcpp::traits::is_na<CPLXSXP>( x ) ? NA_LOGICAL : ( (x.r == 0.0 & x.i == 0.0 ) ? FALSE : TRUE ) ;
                }
        } ;
        template <>
        class not_<CPLXSXP,false>{
        public:
                inline int apply( Rcomplex x ) const {
                        return ((x.r == 0.0) & (x.i == 0.0) ) ? FALSE : TRUE ;
                }
        } ;
        
        

        template <int RTYPE, bool NA, typename T>
        class Not_Vector : public Rcpp::VectorBase<LGLSXP,NA, Not_Vector<RTYPE,NA,T> > {
        public:
                typedef typename Rcpp::VectorBase<RTYPE,NA,T> VEC_TYPE ;
                typedef typename traits::storage_type<RTYPE>::type STORAGE ;
                typedef not_<RTYPE,NA> OPERATOR ;
                
                Not_Vector( const VEC_TYPE& lhs_ ) : 
                        lhs(lhs_), op() {}
                
                inline STORAGE operator[]( int i ) const {
                        return op.apply( lhs[i] ) ;
                }
                
                inline int size() const { return lhs.size() ; }
                
        private:
                const VEC_TYPE& lhs ;
                OPERATOR op ; 
        } ;

}
}

template <int RTYPE,bool NA, typename T>
inline Rcpp::sugar::Not_Vector< RTYPE , NA , T >
operator!( 
        const Rcpp::VectorBase<RTYPE,NA,T>& x
) {
        return Rcpp::sugar::Not_Vector<RTYPE,NA, T >( x ) ;
}


#endif