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// -*- mode: C++; c-indent-level: 4; c-basic-offset: 4; indent-tabs-mode: nil; -*-
//
// Promise.h: Rcpp R/C++ interface class library -- promises (PROMSXP)
//
// Copyright (C) 2010 - 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_Promise_h
#define Rcpp_Promise_h
namespace Rcpp{
RCPP_API_CLASS(Promise_Impl) {
public:
RCPP_GENERATE_CTOR_ASSIGN(Promise_Impl)
Promise_Impl( SEXP x){
if( TYPEOF(x) != PROMSXP) {
const char* fmt = "Not a promise: [type = %s].";
throw not_compatible(fmt, Rf_type2char(TYPEOF(x)));
}
Storage::set__(x) ;
}
/**
* Return the result of the PRSEEN macro
*/
int seen() const {
return PRSEEN(Storage::get__());
}
/**
* Return the result of the PRVALUE macro on the promise
*/
SEXP value() const{
SEXP val = PRVALUE( Storage::get__() ) ;
if( val == R_UnboundValue ) throw unevaluated_promise() ;
return val ;
}
bool was_evaluated() const {
return PRVALUE(Storage::get__()) != R_UnboundValue ;
}
/**
* The promise expression: PRCODE
*/
ExpressionVector expression() const {
return ExpressionVector(PRCODE( Storage::get__() )) ;
}
/**
* The promise environment : PRENV
*/
Environment environment() const {
return Environment( PRENV(Storage::get__() ) ) ;
}
inline void update(SEXP data){}
} ;
typedef Promise_Impl<PreserveStorage> Promise ;
} // namespace
#endif
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