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// -*- mode: C++; c-indent-level: 4; c-basic-offset: 4; tab-width: 8 -*-
//
// SingleLogicalResult.h: Rcpp R/C++ interface class library --
//
// Copyright (C) 2010 - 2012 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__sugar__SingleLogicalResult_h
#define Rcpp__sugar__SingleLogicalResult_h
namespace Rcpp{
namespace sugar{
template <bool>
class forbidden_conversion ;
template <>
class forbidden_conversion<true>{} ;
template <bool x>
class conversion_to_bool_is_forbidden :
forbidden_conversion<x>{
public:
void touch(){}
};
template <bool NA,typename T>
class SingleLogicalResult {
public:
const static int UNRESOLVED = -5 ;
SingleLogicalResult() : result(UNRESOLVED) {} ;
void apply(){
if( result == UNRESOLVED ){
static_cast<T&>(*this).apply() ;
}
}
inline bool is_true(){
apply() ;
return result == TRUE ;
}
inline bool is_false(){
apply() ;
return result == FALSE ;
}
inline bool is_na(){
apply() ;
return Rcpp::traits::is_na<LGLSXP>( result ) ;
}
inline operator SEXP(){
return get_sexp() ;
}
inline operator bool(){
conversion_to_bool_is_forbidden<!NA> x ;
x.touch() ;
return is_true() ;
}
inline int size(){ return 1 ; }
inline int get(){
apply();
return result;
}
inline SEXP get_sexp(){
apply() ;
return Rf_ScalarLogical( result ) ;
}
protected:
int result ;
inline void set(int x){ result = x ;}
inline void reset(){ set(UNRESOLVED) ; }
inline void set_true(){ set(TRUE); }
inline void set_false(){ set(FALSE); }
inline void set_na(){ set(NA_LOGICAL); }
inline bool is_unresolved(){ return result == UNRESOLVED ; }
} ;
}
}
#endif
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