tti/detail/dplaceholder.hpp

0001
0002 //  (C) Copyright Edward Diener 2012,2013
0003 //  Use, modification and distribution are subject to the Boost Software License,
0004 //  Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
0005 //  http://www.boost.org/LICENSE_1_0.txt).
0006
0007 #if !defined(BOOST_TTI_DETAIL_PLACEHOLDER_HPP)
0008 #define BOOST_TTI_DETAIL_PLACEHOLDER_HPP
0009
0010 #include <boost/mpl/lambda.hpp>
0011 #include <boost/mpl/not.hpp>
0012 #include <boost/type_traits/is_same.hpp>
0013
0014 namespace boost
0015   {
0016   namespace tti
0017     {
0018     namespace detail
0019       {
0020       template <class BOOST_TTI_DETAIL_TP_T>
0021       struct is_placeholder_expression :
0022         boost::mpl::not_
0023           <
0024           boost::is_same
0025             <
0026             typename boost::mpl::lambda<BOOST_TTI_DETAIL_TP_T>::type,
0027             BOOST_TTI_DETAIL_TP_T
0028             >
0029           >
0030         {
0031         };
0032       }
0033     }
0034   }
0035
0036 #endif // BOOST_TTI_DETAIL_PLACEHOLDER_HPP