generic_proxy.h

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// generic_proxy.h: Rcpp R/C++ interface class library --
//
// Copyright (C) 2010 - 2018 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__generic_proxy_h
#define Rcpp__vector__generic_proxy_h
 
namespace Rcpp{
namespace internal{
 
        template <int RTYPE, template <class> class StoragePolicy>
        class generic_proxy : public GenericProxy< generic_proxy<RTYPE, StoragePolicy> > {
                public:
                        typedef typename ::Rcpp::Vector<RTYPE, StoragePolicy> VECTOR ;
 
                        generic_proxy(): parent(0), index(-1){}
 
                        generic_proxy( const generic_proxy& other ) :
                                parent(other.parent), index(other.index)
                        {}
 
                        generic_proxy( VECTOR& v, R_xlen_t i ) :
                            parent(&v), index(i)
                        {}
 
                        generic_proxy& operator=(SEXP rhs) {
                                set(rhs) ;
                                return *this ;
                        }
 
                        generic_proxy& operator=(const generic_proxy& rhs){
                            set(rhs.get());
                    return *this ;
                        }
 
                        template <template <class> class StoragePolicy2>
                        generic_proxy& operator=(const generic_proxy<RTYPE,StoragePolicy2>& rhs) {
                            set(rhs.get());
                                return *this ;
                        }
 
                        template <typename T>
                        generic_proxy& operator=( const T& rhs){
                                set(Shield<SEXP>(wrap(rhs))) ;
                                return *this;
                        }
 
                        operator SEXP() const {
                            return get() ;
                        }
 
                        template <typename U> operator U() const {
                                return ::Rcpp::as<U>(get()) ;
                        }
 
                        // helping the compiler (not sure why it can't help itself)
                        operator bool() const { return ::Rcpp::as<bool>(get()) ; }
                        operator int() const { return ::Rcpp::as<int>(get()) ; }
 
                        void swap(generic_proxy& other){
                                Shield<SEXP> tmp(get()) ;
                                set( other.get() ) ;
                                other.set(tmp) ;
                        }
 
                        VECTOR* parent;
                        R_xlen_t index ;
                        inline void move(R_xlen_t n) { index += n ; }
 
                        void import( const generic_proxy& other){
                                parent = other.parent ;
                                index  = other.index ;
                        }
 
                        inline SEXP get() const {
                            return VECTOR_ELT(*parent, index );
                        }
 
                private:
                        inline void set(SEXP x) {
                            SET_VECTOR_ELT( *parent, index, x ) ;
                        }
 
 
        }  ;
 
}
}
 
#endif