SugarMath.h

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// -*- mode: C++; c-indent-level: 4; c-basic-offset: 4; tab-width: 8 -*-
//
// SugarBlock.h: Rcpp R/C++ interface class library -- sugar functions
//
// 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_SUGARMATH_H
#define RCPP_SUGAR_SUGARMATH_H

namespace Rcpp{
namespace sugar{
        
template <bool NA, typename OUT, typename U1, typename T1, typename FunPtr>
class SugarMath_1 : public Rcpp::VectorBase< 
        Rcpp::traits::r_sexptype_traits<OUT>::rtype , 
        NA, 
        SugarMath_1<NA,OUT,U1,T1,FunPtr>
        > {
public:
        
        typedef Rcpp::VectorBase< Rcpp::traits::r_sexptype_traits<OUT>::rtype ,NA,T1> VEC_TYPE ;
        
        SugarMath_1( FunPtr ptr_, const VEC_TYPE & vec_) : ptr(ptr_), vec(vec_){}
        
        inline OUT operator[]( int i) const { 
                U1 x = vec[i] ;
                if( ISNAN(x) ) return x;
                return ptr( x ) ;
        }
        inline int size() const { return vec.size() ; }
        
private:
        FunPtr ptr ;
        const VEC_TYPE& vec ;
};

template <bool NA, typename OUT, typename T1, typename FunPtr>
class SugarMath_1<NA,OUT,int,T1,FunPtr> : public Rcpp::VectorBase< 
        Rcpp::traits::r_sexptype_traits<OUT>::rtype , 
        NA, 
        SugarMath_1<NA,OUT,int,T1,FunPtr>
        > {
public:
        typedef Rcpp::VectorBase< INTSXP ,NA,T1> VEC_TYPE ;
        
        SugarMath_1( FunPtr ptr_, const VEC_TYPE & vec_) : ptr(ptr_), vec(vec_){}
        
        inline OUT operator[]( int i) const { 
                int x = vec[i] ;
                if( Rcpp::traits::is_na<INTSXP>(x) ) return Rcpp::traits::get_na<REALSXP>( ) ;
                return ptr( x ) ;
        }
        inline int size() const { return vec.size() ; }
        
private:
        FunPtr ptr ;
        const VEC_TYPE& vec ;
};

template <typename OUT, typename T1, typename FunPtr>
class SugarMath_1<false,OUT,int,T1,FunPtr> : public 
Rcpp::VectorBase< 
        Rcpp::traits::r_sexptype_traits<OUT>::rtype , 
        false, 
        SugarMath_1<false,OUT,int,T1,FunPtr>
> {
public:
        typedef Rcpp::VectorBase< INTSXP ,false,T1> VEC_TYPE ;
        SugarMath_1( FunPtr ptr_, const VEC_TYPE & vec_) : ptr(ptr_), vec(vec_){}
        
        inline OUT operator[]( int i) const { 
                return ptr( vec[i] ) ;
        }
        inline int size() const { return vec.size() ; }
        
private:
        FunPtr ptr ;
        const VEC_TYPE& vec ;
};


} // sugar
} // Rcpp

#define SUGAR_MATH_1(__NAME__,__SYMBOL__)                                    \
        namespace Rcpp{                                                          \
        template <bool NA, typename T>                                           \
        inline sugar::SugarMath_1<NA,double,double,T, double (*)(double) >       \
        __NAME__(                                                                \
                const VectorBase<REALSXP,NA,T>& t                                    \
        ){                                                                       \
                return sugar::SugarMath_1<NA,double,double,T, double (*)(double)>(   \
                        &__SYMBOL__ , t                                                   \
                ) ;                                                                  \
        }                                                                        \
        inline sugar::SugarMath_1<true,double,double,NumericVector,double(*)(double)>   \
        __NAME__( SEXP x){ return __NAME__( NumericVector( x ) ) ; }             \
        template <bool NA, typename T>                                           \
        inline sugar::SugarMath_1<NA,double,int,T, double (*)(double) >          \
        __NAME__(                                                                \
                const VectorBase<INTSXP,NA,T>& t                                     \
        ){                                                                       \
                return sugar::SugarMath_1<NA,double,int,T, double (*)(double)>(      \
                        &__SYMBOL__ , t                                                   \
                ) ;                                                                  \
        }                                                                        \
        }

#endif