is_na.h

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// -*- mode: C++; c-indent-level: 4; c-basic-offset: 4; tab-width: 8 -*-
//
// any.h: Rcpp R/C++ interface class library -- any
//
// 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__is_na_h
#define Rcpp__sugar__is_na_h

namespace Rcpp{
namespace sugar{

template <int RTYPE, bool NA, typename VEC_TYPE>
class IsNa : public ::Rcpp::VectorBase< LGLSXP, false, IsNa<RTYPE,NA,VEC_TYPE> > {
public:
        typedef typename traits::storage_type<RTYPE>::type STORAGE ;
        typedef Rcpp::VectorBase<RTYPE,NA,VEC_TYPE> BASE ;
        
        IsNa( const BASE& obj_) : obj(obj_){}
        
        inline int operator[]( int i ) const {
                return ::Rcpp::traits::is_na<RTYPE>( obj[i] ) ;
        }
        
        inline int size() const { return obj.size() ; }
                 
private:
        const BASE& obj ;
        
} ;
      
// specialization for the case where we already know
// the result (FALSE) because it is embedded in the type
// (the second template parameter of VectorBase)
template <int RTYPE, typename VEC_TYPE>
class IsNa<RTYPE,false,VEC_TYPE> : public ::Rcpp::VectorBase< LGLSXP, false, IsNa<RTYPE,false,VEC_TYPE> > {
public:
        typedef typename traits::storage_type<RTYPE>::type STORAGE ;
        typedef Rcpp::VectorBase<RTYPE,false,VEC_TYPE> BASE ;
        
        IsNa( const BASE& obj_) : obj(obj_){}
        
        inline int operator[]( int i ) const {
                return FALSE ;
        }
        
        inline int size() const { return obj.size() ; }
        
private:
        const BASE& obj ;
        
} ;

        
} // sugar

template <int RTYPE, bool NA, typename T>
inline sugar::IsNa<RTYPE,NA,T> is_na( const Rcpp::VectorBase<RTYPE,NA,T>& t){
        return sugar::IsNa<RTYPE,NA,T>( t ) ;
}

} // Rcpp
#endif