// -*- mode: C++; c-indent-level: 4; c-basic-offset: 4; tab-width: 8 -*-
//
// is_na.h: Rcpp R/C++ interface class library -- vector operators
//                                                                      
// 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__traits_is_na_h
#define Rcpp__traits_is_na_h

namespace Rcpp{
namespace traits{
	
	// default to always false, applies to VECSXP, EXPRSXP and RAWSXP
	template <int RTYPE> 
	bool is_na( typename storage_type<RTYPE>::type ){
	    return false ;    
	}
	
	template <> 
	inline bool is_na<INTSXP>( int x ){
		return x == NA_INTEGER ;
	}
	
	template <> 
	inline bool is_na<REALSXP>( double x ){
		return R_IsNA(x) ;
	}
	
	template <> 
	inline bool is_na<CPLXSXP>( Rcomplex x ){
		return R_IsNA(x.r) || R_IsNA(x.i) ;
	}
	
	template <>
	inline bool is_na<STRSXP>( SEXP x ){ return x == NA_STRING ; }
	
	template <>
	inline bool is_na<LGLSXP>( int x ){ return x == NA_LOGICAL ; }
	
}
}

#endif
