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File: XPtr.cpp
// -*- mode: C++; c-indent-level: 4; c-basic-offset: 4; tab-width: 8 -*- // // XPtr.cpp: Rcpp R/C++ interface class library -- external pointer unit tests // // Copyright (C) 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/>. #include <Rcpp.h> using namespace Rcpp ; // [[Rcpp::export]] XPtr< std::vector<int> > xptr_1(){ /* creating a pointer to a vector<int> */ std::vector<int>* v = new std::vector<int> ; v->push_back( 1 ) ; v->push_back( 2 ) ; /* wrap the pointer as an external pointer */ /* this automatically protected the external pointer from R garbage collection until p goes out of scope. */ XPtr< std::vector<int> > p(v) ; /* return it back to R, since p goes out of scope after the return the external pointer is no more protected by p, but it gets protected by being on the R side */ return( p ) ; } // [[Rcpp::export]] int xptr_2( XPtr< std::vector<int> > p){ /* just return the front of the vector as a SEXP */ return p->front() ; } // [[Rcpp::export]] void xptr_self_tag( XPtr< std::vector<int> > p ){ XPtr< std::vector<int> > self_tag(wrap(p), wrap(p), R_NilValue) ; } // [[Rcpp::export]] bool xptr_has_self_tag( XPtr< std::vector<int> > p ){ return wrap(p) == R_ExternalPtrTag(p); } // [[Rcpp::export]] bool xptr_release( XPtr< std::vector<int> > p) { p.release(); return !p; } // [[Rcpp::export]] bool xptr_access_released( XPtr< std::vector<int> > p) { // double-release should be a no-op p.release(); // get should return NULL return p.get() == NULL; } // [[Rcpp::export]] int xptr_use_released( XPtr< std::vector<int> > p ) { return p->front(); }