is_sugar_expression.h

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// -*- mode: C++; c-indent-level: 4; c-basic-offset: 4; tab-width: 4 -*-
//
// is_sugar_expression.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__traits__is_sugar_expression_h
#define Rcpp__traits__is_sugar_expression_h
 
namespace Rcpp{
namespace traits{
 
        template<typename T>
        class _is_sugar_expression_helper : __sfinae_types {
      template<typename U> struct _Wrap_type { };
 
      template<typename U>
        static __one __test(_Wrap_type<typename U::rcpp_sugar_expression>*);
 
      template<typename U>
        static __two __test(...);
 
    public:
      static const bool value = sizeof(__test<T>(0)) == 1;
    };
 
  template<typename T> struct is_sugar_expression :
        integral_constant<bool, _is_sugar_expression_helper<T>::value >{ };
 
 
}
}
 
#endif