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// PreserveStorage.h: Rcpp R/C++ interface class library -- helper class
//
// Copyright (C) 2013 - 2020 Romain Francois
// Copyright (C) 2021 Romain Francois and Iñaki Ucar
//
// 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_PreserveStorage_h
#define Rcpp_PreserveStorage_h
namespace Rcpp{
template <typename CLASS>
class PreserveStorage {
public:
PreserveStorage() : data(R_NilValue), token(R_NilValue){}
~PreserveStorage(){
Rcpp_PreciousRelease(token) ;
data = R_NilValue;
token = R_NilValue;
}
inline void set__(SEXP x){
if (data != x) {
data = x;
Rcpp_PreciousRelease(token);
token = Rcpp_PreciousPreserve(data);
}
// calls the update method of CLASS
// this is where to react to changes in the underlying SEXP
static_cast<CLASS&>(*this).update(data) ;
}
inline SEXP get__() const {
return data ;
}
inline SEXP invalidate__(){
SEXP out = data ;
Rcpp_PreciousRelease(token);
data = R_NilValue ;
token = R_NilValue ;
return out ;
}
template <typename T>
inline T& copy__(const T& other){
if( this != &other){
set__(other.get__());
}
return static_cast<T&>(*this) ;
}
inline bool inherits(const char* clazz) const {
return ::Rf_inherits( data, clazz) ;
}
inline operator SEXP() const { return data; }
private:
SEXP data ;
SEXP token ;
} ;
}
#endif
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