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Copy pathSlotProxy.h
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69 lines (57 loc) · 1.89 KB
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#ifndef Rcpp_SlotProxy_h
#define Rcpp_SlotProxy_h
namespace Rcpp{
template <typename CLASS>
class SlotProxy : public GenericProxy<SlotProxy<CLASS>> {
public:
SlotProxy( CLASS& v, SEXP name) :
parent(v), slot_name(name)
{
if( !R_has_slot( v, slot_name) ){
stop("no such slot: %s", CHAR(PRINTNAME(name)) ) ;
}
}
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);
}
} ;
template <typename CLASS>
SlotProxy<CLASS> slot(CLASS& x, const std::string& name) {
if( !Rf_isS4(x) ) stop("not an S4 object");
return SlotProxy<CLASS>(x, Rf_install(name.c_str()) ) ;
}
template <typename CLASS>
const SlotProxy<CLASS> slot(const CLASS& x, const std::string& name) {
if( !Rf_isS4(x) ) stop("not an S4 object");
return SlotProxy<CLASS>( const_cast<CLASS&>(x) , Rf_install(name.c_str()) ) ;
}
inline bool has_slot(SEXP data, const std::string& name) {
if( !Rf_isS4(data) ) stop("not an S4 object");
return R_has_slot( data, Rf_mkString(name.c_str()) ) ;
}
inline bool isS4(SEXP data) {
return ::Rf_isS4(data) ;
}
}
#endif