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// Copyright (C) 2013 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_proxy_SlotProxy_h
#define Rcpp_proxy_SlotProxy_h
namespace Rcpp{
template <typename CLASS>
class SlotProxyPolicy {
public:
class SlotProxy : public GenericProxy<SlotProxy>{
public:
SlotProxy( CLASS& v, const std::string& name) : parent(v), slot_name(Rf_install(name.c_str())) {
if( !R_has_slot( v, slot_name) ){
throw no_such_slot(name);
}
}
SlotProxy& operator=(const SlotProxy& rhs){
set( rhs.get() ) ;
return *this ;
}
template <typename T> SlotProxy& operator=(const T& rhs);
template <typename T> operator T() const;
inline operator SEXP() const {
return get() ;
}
private:
CLASS& parent;
SEXP slot_name ;
SEXP get() const {
return R_do_slot( parent, slot_name ) ;
}
void set(SEXP x ) {
parent = R_do_slot_assign(parent, slot_name, x);
}
} ;
class const_SlotProxy : public GenericProxy<const_SlotProxy> {
public:
const_SlotProxy( const CLASS& v, const std::string& name) : parent(v), slot_name(Rf_install(name.c_str())) {
if( !R_has_slot( v, slot_name) ){
throw no_such_slot(name);
}
}
template <typename T> operator T() const {
return as<T>( get() );
}
inline operator SEXP() const {
return get() ;
}
private:
const CLASS& parent;
SEXP slot_name ;
SEXP get() const {
return R_do_slot( parent, slot_name ) ;
}
} ;
SlotProxy slot(const std::string& name){
SEXP x = static_cast<CLASS&>(*this) ;
if( !Rf_isS4(x) ) throw not_s4() ;
return SlotProxy( static_cast<CLASS&>(*this) , name ) ;
}
const_SlotProxy slot(const std::string& name) const {
SEXP x = static_cast<const CLASS&>(*this) ;
if( !Rf_isS4(x) ) throw not_s4() ;
return const_SlotProxy( static_cast<const CLASS&>(*this) , name ) ;
}
bool hasSlot(const std::string& name) const{
SEXP x = static_cast<const CLASS&>(*this).get__() ;
if( !Rf_isS4(x) ) throw not_s4() ;
return R_has_slot( x, Rf_mkString(name.c_str()) ) ;
}
} ;
}
#endif
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