sapply.h

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

namespace Rcpp{
namespace sugar{

template <int RTYPE, bool NA, typename T, typename Function, bool NO_CONVERSION>
class Sapply : public VectorBase< 
        Rcpp::traits::r_sexptype_traits<
                typename ::Rcpp::traits::result_of<Function>::type
        >::rtype , 
        true ,
        Sapply<RTYPE,NA,T,Function,NO_CONVERSION>
> {
public:
        typedef typename ::Rcpp::traits::result_of<Function>::type result_type ;
        const static int RESULT_R_TYPE = 
                Rcpp::traits::r_sexptype_traits<result_type>::rtype ;
        
        typedef Rcpp::VectorBase<RTYPE,NA,T> VEC ;
        typedef typename Rcpp::traits::r_vector_element_converter<RESULT_R_TYPE>::type converter_type ;
        typedef typename Rcpp::traits::storage_type<RESULT_R_TYPE>::type STORAGE ;
        
        typedef typename Rcpp::traits::Extractor< RTYPE, NA, T>::type EXT ;
        
        Sapply( const VEC& vec_, Function fun_ ) : vec(vec_.get_ref()), fun(fun_){}
        
        inline STORAGE operator[]( int i ) const {
                return converter_type::get( fun( vec[i] ) );
        }
        inline int size() const { return vec.size() ; }
                 
private:
        const EXT& vec ;
        Function fun ;
        
} ;


template <int RTYPE, bool NA, typename T, typename Function>
class Sapply<RTYPE,NA,T,Function,true> : public VectorBase< 
        Rcpp::traits::r_sexptype_traits<
                typename ::Rcpp::traits::result_of<Function>::type
        >::rtype , 
        true ,
        Sapply<RTYPE,NA,T,Function,true>
> {
public:
        typedef typename ::Rcpp::traits::result_of<Function>::type result_type ;
        const static int RESULT_R_TYPE = 
                Rcpp::traits::r_sexptype_traits<result_type>::rtype ;
        
        typedef Rcpp::VectorBase<RTYPE,NA,T> VEC ;
        typedef typename Rcpp::traits::storage_type<RESULT_R_TYPE>::type STORAGE ;
        
        typedef typename Rcpp::traits::Extractor< RTYPE, NA, T>::type EXT ;
        
        Sapply( const VEC& vec_, Function fun_ ) : vec(vec_.get_ref()), fun(fun_){}
        
        inline STORAGE operator[]( int i ) const {
                return fun( vec[i] ) ;
        }
        inline int size() const { return vec.size() ; }
                 
private:
        const EXT& vec ;
        Function fun ;
        
} ;
        

} // sugar

template <int RTYPE, bool NA, typename T, typename Function >
inline sugar::Sapply<
    RTYPE,NA,T,Function, 
    traits::same_type< 
        typename ::Rcpp::traits::result_of<Function>::type ,  
        typename Rcpp::traits::storage_type< traits::r_sexptype_traits< typename ::Rcpp::traits::result_of<Function>::type >::rtype >::type
    >::value
> 
sapply( const Rcpp::VectorBase<RTYPE,NA,T>& t, Function fun ){
        return sugar::Sapply<RTYPE,NA,T,Function, 
        traits::same_type< 
        typename ::Rcpp::traits::result_of<Function>::type ,  
        typename Rcpp::traits::storage_type< traits::r_sexptype_traits< typename ::Rcpp::traits::result_of<Function>::type >::rtype >::type
    >::value >( t, fun ) ;
}

} // Rcpp

#endif