is_convertible.h

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// -*- mode: C++; c-indent-level: 4; c-basic-offset: 4; tab-width: 8 -*-
/* :tabSize=4:indentSize=4:noTabs=false:folding=explicit:collapseFolds=1: */
//
// is_convertible.h: Rcpp R/C++ interface class library -- type conversion detection
//
// 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__traits__is_convertible_h
#define Rcpp__traits__is_convertible_h
 
namespace Rcpp{
namespace traits{
 
        template<typename T, typename U> class is_convertible{
 
                typedef char Small ;
                typedef struct { char dummy[2] ; } Big ;
                static Small Test( const U& ) ;
                static Big Test(...) ;
                static T MakeT() ;
 
        public:
 
                typedef bool value_type ;
                static const bool value = sizeof(Test(MakeT())) == sizeof(Small) ;
                typedef integral_constant<bool,value> type ;
 
        } ;
 
}
}
 
#endif