00_forward_eval_methods.h

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// -*- mode: C++; c-indent-level: 4; c-basic-offset: 4; indent-tabs-mode: nil; -*-
//
// eval_methods.h: Rcpp R/C++ interface class library -- 
//
// 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/>.

#ifndef Rcpp__vector__forward_eval_methods_h
#define Rcpp__vector__forward_eval_methods_h

namespace internal{
    template <int RTYPE>
    SEXP vector_from_string( const std::string& st ) {
        return r_cast<RTYPE>( Rf_mkString( st.c_str() ) ) ;
    }
        
    template <int RTYPE>
    SEXP vector_from_string_expr( const std::string& code) {
        ParseStatus status;
        SEXP expr = PROTECT( ::Rf_mkString( code.c_str() ) );
        SEXP res  = PROTECT( ::R_ParseVector(expr, -1, &status, R_NilValue));
        switch( status ){
        case PARSE_OK:
            UNPROTECT( 2) ;
            return(res) ;
            break;
        default:
            UNPROTECT(2) ;
            throw parse_error() ;
        }
        return R_NilValue ; /* -Wall */
    }
        
    template <>
    inline SEXP vector_from_string<EXPRSXP>( const std::string& st ) {
        return vector_from_string_expr<EXPRSXP>( st ) ;
    }
        
    template <int RTYPE> class eval_methods {} ;
    template <> class eval_methods<EXPRSXP> ;
        
}
#endif