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// -*- mode: C++; c-indent-level: 4; c-basic-offset: 4; indent-tabs-mode: nil; -*-
//
// WeakReference.h: Rcpp R/C++ interface class library -- weak references
//
// Copyright (C) 2009 - 2013 Dirk Eddelbuettel and 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_WeakReference_h
#define Rcpp_WeakReference_h
namespace Rcpp{
RCPP_API_CLASS(WeakReference_Impl) {
public:
RCPP_GENERATE_CTOR_ASSIGN(WeakReference_Impl)
WeakReference_Impl(){}
/**
* wraps a weak reference
*
* @param x presumably a SEXP of SEXTYPE WEAKREFSXP
*
* @throw not_compatible if x is not a weak reference
*/
WeakReference_Impl( SEXP x){
if( TYPEOF(x) != WEAKREFSXP )
throw not_compatible( "not a weak reference" ) ;
Storage::set__(x);
}
/**
* Retrieve the key
*/
SEXP key() const {
return R_WeakRefKey(Storage::get__()) ;
}
/**
* Retrieve the value
*/
SEXP value() const {
return R_WeakRefValue(Storage::get__());
}
void update(SEXP){}
} ;
typedef WeakReference_Impl<PreserveStorage> WeakReference ;
}
#endif
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