converter.h

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// -*- mode: C++; c-indent-level: 4; c-basic-offset: 4; tab-width: 8 -*-
//
// converter.h: Rcpp R/C++ interface class library -- converters
//
// Copyright (C) 2010 - 2013 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__vector__converters_h
#define Rcpp__vector__converters_h
 
namespace Rcpp{
namespace internal {
        template <int RTYPE>
        class element_converter{
        public:
                typedef typename ::Rcpp::traits::storage_type<RTYPE>::type target ;
 
                template <typename T>
                static target get( const T& input ){
                        return caster<T,target>(input) ;
                }
 
                static target get( const target& input ){
                        return input ;
                }
        } ;
 
        template <int RTYPE>
        class string_element_converter {
        public:
                typedef SEXP target ;
 
                template <typename T>
                static SEXP get( const T& input){
                        std::string out(input) ;
                        RCPP_DEBUG_1( "string_element_converter::get< T = %s >()", DEMANGLE(T) )
                        return Rf_mkChar( out.c_str() ) ;
                }
 
                static SEXP get(const std::string& input){
                        RCPP_DEBUG( "string_element_converter::get< std::string >()" )
                        return Rf_mkChar( input.c_str() ) ;
                }
 
                static SEXP get( const Rcpp::String& input) ;
 
                static SEXP get(const char& input){
                    RCPP_DEBUG( "string_element_converter::get< char >()" )
                        return Rf_mkCharLen( &input, 1 ) ;
                }
 
                // assuming a CHARSXP
                static SEXP get(SEXP x){
                    RCPP_DEBUG( "string_element_converter::get< SEXP >()" )
                    return x;
                }
        } ;
 
        template <int RTYPE>
        class generic_element_converter {
        public:
                typedef SEXP target ;
 
                template <typename T>
                static SEXP get( const T& input){
                        return ::Rcpp::wrap( input ) ;
                }
 
                static SEXP get( const char* input){
                        return ::Rcpp::wrap( input );
                }
 
                static SEXP get(SEXP input){
                        return input ;
                }
        } ;
}
 
namespace traits{
        template <int RTYPE> struct r_vector_element_converter{
                typedef typename ::Rcpp::internal::element_converter<RTYPE> type ;
        } ;
        template<> struct r_vector_element_converter<STRSXP>{
                typedef ::Rcpp::internal::string_element_converter<STRSXP> type ;
        } ;
        template<> struct r_vector_element_converter<VECSXP>{
                typedef ::Rcpp::internal::generic_element_converter<VECSXP> type ;
        } ;
        template<> struct r_vector_element_converter<EXPRSXP>{
                typedef ::Rcpp::internal::generic_element_converter<EXPRSXP> type ;
        } ;
}
}
 
#endif