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SlotProxy.h
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108 lines (88 loc) · 2.71 KB
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#ifndef Rcpp_SlotProxy_h
#define Rcpp_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() ;
}
}
SlotProxy& operator=(const SlotProxy& rhs) {
set( rhs.get() ) ;
return *this ;
}
template <typename T>
SlotProxy& operator=(const T& rhs) {
set( wrap( rhs ) ) ;
return *this ;
}
template <typename T> operator T() const {
return as<T>(get()) ;
}
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() ;
}
}
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 = ref() ;
if( !Rf_isS4(x) ) throw not_s4() ;
return SlotProxy( static_cast<CLASS&>(*this) , name ) ;
}
const_SlotProxy slot(const std::string& name) const {
SEXP x = ref() ;
if( !Rf_isS4(x) ) throw not_s4() ;
return const_SlotProxy( static_cast<const CLASS&>(*this) , name ) ;
}
bool hasSlot(const std::string& name) const {
SEXP data = ref() ;
if( !Rf_isS4(data) ) throw not_s4() ;
return R_has_slot( data, Rf_mkString(name.c_str()) ) ;
}
inline bool isS4() const {
return ::Rf_isS4(ref()) ;
}
private:
CLASS& ref(){
return static_cast<CLASS&>(*this) ;
}
const CLASS& ref() const{
return static_cast<const CLASS&>(*this) ;
}
} ;
}
#endif