1 
2 //  (C) Copyright Edward Diener 2012,2013
3 //  Use, modification and distribution are subject to the Boost Software License,
4 //  Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
5 //  http://www.boost.org/LICENSE_1_0.txt).
6 
7 #if !defined(BOOST_TTI_DETAIL_PLACEHOLDER_HPP)
8 #define BOOST_TTI_DETAIL_PLACEHOLDER_HPP
9 
10 #include <boost/mpl/lambda.hpp>
11 #include <boost/mpl/not.hpp>
12 #include <boost/type_traits/is_same.hpp>
13 
14 namespace boost
15   {
16   namespace tti
17     {
18     namespace detail
19       {
20       template <class BOOST_TTI_DETAIL_TP_T>
21       struct is_placeholder_expression :
22         boost::mpl::not_
23           <
24           boost::is_same
25             <
26             typename boost::mpl::lambda<BOOST_TTI_DETAIL_TP_T>::type,
27             BOOST_TTI_DETAIL_TP_T
28             >
29           >
30         {
31         };
32       }
33     }
34   }
35 
36 #endif // BOOST_TTI_DETAIL_PLACEHOLDER_HPP
37