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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_AttributeProxy_h
#define Rcpp_proxy_AttributeProxy_h
namespace Rcpp{
template <typename CLASS>
class AttributeProxyPolicy {
public:
class AttributeProxy : public GenericProxy<AttributeProxy> {
public:
AttributeProxy( CLASS& v, const std::string& name)
: parent(v), attr_name(Rf_install(name.c_str()))
{}
AttributeProxy& operator=(const AttributeProxy& rhs){
if( this != &rhs ) set( rhs.get() ) ;
return *this ;
}
template <typename T> AttributeProxy& operator=(const T& rhs);
template <typename T> operator T() const;
inline operator SEXP() const;
private:
CLASS& parent;
SEXP attr_name ;
SEXP get() const {
return Rf_getAttrib( parent, attr_name ) ;
}
void set(SEXP x ){
Rf_setAttrib( parent, attr_name, Shield<SEXP>(x) ) ;
}
} ;
class const_AttributeProxy : public GenericProxy<const_AttributeProxy> {
public:
const_AttributeProxy( const CLASS& v, const std::string& name)
: parent(v), attr_name(Rf_install(name.c_str())){}
template <typename T> operator T() const;
inline operator SEXP() const;
private:
const CLASS& parent;
SEXP attr_name ;
SEXP get() const {
return Rf_getAttrib( parent, attr_name ) ;
}
} ;
AttributeProxy attr( const std::string& name){
return AttributeProxy( static_cast<CLASS&>( *this ), name ) ;
}
const_AttributeProxy attr( const std::string& name) const {
return const_AttributeProxy( static_cast<const CLASS&>( *this ), name ) ;
}
std::vector<std::string> attributeNames() const {
std::vector<std::string> v ;
SEXP attrs = ATTRIB( static_cast<const CLASS&>(*this).get__());
while( attrs != R_NilValue ){
v.push_back( std::string(CHAR(PRINTNAME(TAG(attrs)))) ) ;
attrs = CDR( attrs ) ;
}
return v ;
}
bool hasAttribute( const std::string& attr) const {
SEXP attrs = ATTRIB(static_cast<const CLASS&>(*this).get__());
while( attrs != R_NilValue ){
if( attr == CHAR(PRINTNAME(TAG(attrs))) ){
return true ;
}
attrs = CDR( attrs ) ;
}
return false; /* give up */
}
} ;
}
#endif
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