Function.cpp

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// -*- mode: C++; c-indent-level: 4; c-basic-offset: 4; indent-tabs-mode: nil; -*-
//
// Function.cpp: Rcpp R/C++ interface class library -- functions
//
// Copyright (C) 2010 - 2011 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/Function.h>

namespace Rcpp {
        
    Function::Function( SEXP x = R_NilValue ) : RObject( ){
        switch( TYPEOF(x) ){
        case CLOSXP:
        case SPECIALSXP:
        case BUILTINSXP:
            setSEXP(x); 
            break; 
        default:
            throw not_compatible("cannot convert to function") ;
        }
    }
        
    Function::Function(const std::string& name) : RObject() {
        SEXP nameSym = Rf_install( name.c_str() );      // cannot be gc()'ed  once in symbol table
        SEXP x = PROTECT( Rf_findFun( nameSym, R_GlobalEnv ) ) ;
        setSEXP( x ) ;
        UNPROTECT(1) ;
    }
        
    Function::Function(const Function& other) : RObject(){
        setSEXP( other.asSexp() );
    }
        
    Function& Function::operator=(const Function& other){
        setSEXP( other.asSexp() );
        return *this ;
    }
        
    Function::~Function(){}     
        
    SEXP Function::environment() const {
        if( TYPEOF(m_sexp) != CLOSXP ) {
            throw not_a_closure() ;
        }
        return CLOENV(m_sexp) ;
    }
        
    SEXP Function::body() const {
        return BODY( m_sexp ) ;
    }
        
} // namespace Rcpp