traits.h

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// -*- mode: C++; c-indent-level: 4; c-basic-offset: 4; tab-width: 8 -*-
//
// traits.h: Rcpp R/C++ interface class library -- support traits for vector
//
// 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__traits_h
#define Rcpp__vector__traits_h
 
namespace Rcpp{
namespace traits{
 
        template <int RTYPE, template <class> class StoragePolicy = PreserveStorage >
        class r_vector_cache{
        public:
                typedef typename ::Rcpp::Vector<RTYPE, StoragePolicy> VECTOR ;
                typedef typename r_vector_iterator<RTYPE>::type iterator ;
                typedef typename r_vector_const_iterator<RTYPE>::type const_iterator ;
                typedef typename r_vector_proxy<RTYPE>::type proxy ;
                typedef typename r_vector_const_proxy<RTYPE>::type const_proxy ;
                typedef typename storage_type<RTYPE>::type storage_type ;
 
                r_vector_cache() : start(0){} ;
                inline void update( const VECTOR& v ) {
                    start = ::Rcpp::internal::r_vector_start<RTYPE>(v) ;
                }
                inline iterator get() const { return start; }
                inline const_iterator get_const() const { return start; }
 
                inline proxy ref() { return *start ;}
                inline proxy ref(R_xlen_t i) { return start[i] ; }
 
                inline proxy ref() const { return *start ;}
                inline proxy ref(R_xlen_t i) const { return start[i] ; }
 
                private:
                        iterator start ;
        } ;
        template <int RTYPE, template <class> class StoragePolicy = PreserveStorage>
        class proxy_cache{
        public:
                typedef typename ::Rcpp::Vector<RTYPE, StoragePolicy> VECTOR ;
                typedef typename r_vector_iterator<RTYPE, StoragePolicy>::type iterator ;
                typedef typename r_vector_const_iterator<RTYPE, StoragePolicy>::type const_iterator ;
                typedef typename r_vector_proxy<RTYPE, StoragePolicy>::type proxy ;
                typedef typename r_vector_const_proxy<RTYPE, StoragePolicy>::type const_proxy ;
 
                proxy_cache(): p(0){}
                ~proxy_cache(){}
                void update( const VECTOR& v ){
                        p = const_cast<VECTOR*>(&v) ;
                }
                inline iterator get() const { return iterator( proxy(*p, 0 ) ) ;}
                // inline const_iterator get_const() const { return const_iterator( *p ) ;}
                inline const_iterator get_const() const { return const_iterator( const_proxy(*p, 0) ) ; }
 
                inline proxy ref() { return proxy(*p,0) ; }
                inline proxy ref(R_xlen_t i) { return proxy(*p,i);}
 
                inline const_proxy ref() const { return const_proxy(*p,0) ; }
                inline const_proxy ref(R_xlen_t i) const { return const_proxy(*p,i);}
 
        private:
                VECTOR* p ;
        } ;
 
        // regular types for INTSXP, REALSXP, ...
        template <int RTYPE, template <class> class StoragePolicy = PreserveStorage>
        struct r_vector_cache_type {
            typedef r_vector_cache<RTYPE, StoragePolicy> type ;
        } ;
 
        // proxy types for VECSXP, STRSXP and EXPRSXP
        template <template <class> class StoragePolicy>
        struct r_vector_cache_type<VECSXP, StoragePolicy>  {
            typedef proxy_cache<VECSXP, StoragePolicy> type ;
        } ;
        template <template <class> class StoragePolicy>
        struct r_vector_cache_type<EXPRSXP, StoragePolicy> {
            typedef proxy_cache<EXPRSXP, StoragePolicy> type ;
        } ;
        template <template <class> class StoragePolicy>
        struct r_vector_cache_type<STRSXP, StoragePolicy>  {
            typedef proxy_cache<STRSXP, StoragePolicy> type ;
        } ;
 
} // traits
}
 
#endif