WeakReference.h

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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(){}
 
        WeakReference_Impl( SEXP x){
             if( TYPEOF(x) != WEAKREFSXP )
                throw not_compatible( "not a weak reference" ) ;
            Storage::set__(x);
        }
 
        SEXP key() const {
            return R_WeakRefKey(Storage::get__()) ;
        }
 
        SEXP value() const {
            return R_WeakRefValue(Storage::get__());
        }
 
        void update(SEXP){}
 
    } ;
 
    typedef WeakReference_Impl<PreserveStorage> WeakReference ;
}
 
#endif