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// Copyright (C) 2013 Romain Francois and Kevin Ushey
//
// 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__protection_Shield_h
#define Rcpp__protection_Shield_h
namespace Rcpp{
inline SEXP Rcpp_protect(SEXP x){
if( x != R_NilValue ) PROTECT(x) ;
return x ;
}
inline void Rcpp_unprotect(int i){
// Prefer this function over UNPROTECT() in Rcpp so that all
// balance checks errors by rchk are contained at one location (#892)
UNPROTECT(i);
}
template <typename T>
class Shield{
public:
Shield( SEXP t_) : t(Rcpp_protect(t_)){}
~Shield(){
if( t != R_NilValue ) Rcpp_unprotect(1) ;
}
operator SEXP() const { return t; }
SEXP t ;
private:
Shield( const Shield& ) ;
Shield& operator=( const Shield& ) ;
} ;
}
#endif
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