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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_EnvironmentBinding_h
#define Rcpp_proxy_EnvironmentBinding_h
namespace Rcpp{
template <typename EnvironmentClass>
class BindingPolicy {
public:
class Binding : public GenericProxy<Binding> {
public:
Binding( EnvironmentClass& env_, const std::string& name_) :
env(env_), name(name_){}
inline bool active() const {
return env.bindingIsActive(name) ;
}
inline bool locked() const {
return env.bindingIsLocked(name) ;
}
inline bool exists() const {
return env.exists(name) ;
}
void lock() {
env.lockBinding(name) ;
}
void unlock(){
env.unlockBinding(name) ;
}
Binding& operator=(const Binding& rhs){
if( *this != rhs )
set( rhs.get() ) ;
return *this ;
}
template <typename WRAPPABLE>
Binding& operator=(const WRAPPABLE& rhs);
template <typename T> operator T() const;
private:
SEXP get() const {
return env.get( name ) ;
}
void set( SEXP x){
env.assign(name, x ) ;
}
EnvironmentClass& env ;
std::string name ;
} ;
class const_Binding : public GenericProxy<const_Binding> {
public:
const_Binding( const EnvironmentClass& env_, const std::string& name_) :
env(env_), name(name_){}
inline bool active() const {
return env.bindingIsActive(name) ;
}
inline bool locked() const {
return env.bindingIsLocked(name) ;
}
inline bool exists() const {
return env.exists(name) ;
}
template <typename T> operator T() const;
private:
SEXP get() const {
return env.get( name ) ;
}
const EnvironmentClass& env ;
std::string name ;
} ;
const_Binding operator[]( const std::string& name) const {
return const_Binding( static_cast<const EnvironmentClass&>(*this), name ) ;
}
Binding operator[](const std::string& name){
return Binding( static_cast<EnvironmentClass&>(*this), name ) ;
}
} ;
}
#endif
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