1 
2 #ifndef BOOST_MPL_HAS_KEY_HPP_INCLUDED
3 #define BOOST_MPL_HAS_KEY_HPP_INCLUDED
4 
5 // Copyright Aleksey Gurtovoy 2003-2004
6 // Copyright David Abrahams 2003-2004
7 //
8 // Distributed under the Boost Software License, Version 1.0.
9 // (See accompanying file LICENSE_1_0.txt or copy at
10 // http://www.boost.org/LICENSE_1_0.txt)
11 //
12 // See http://www.boost.org/libs/mpl for documentation.
13 
14 // $Id$
15 // $Date$
16 // $Revision$
17 
18 #include <boost/mpl/has_key_fwd.hpp>
19 #include <boost/mpl/sequence_tag.hpp>
20 #include <boost/mpl/aux_/has_key_impl.hpp>
21 #include <boost/mpl/aux_/na_spec.hpp>
22 #include <boost/mpl/aux_/lambda_support.hpp>
23 
24 namespace boost { namespace mpl {
25 
26 template<
27       typename BOOST_MPL_AUX_NA_PARAM(AssociativeSequence)
28     , typename BOOST_MPL_AUX_NA_PARAM(Key)
29     >
30 struct has_key
31     : has_key_impl< typename sequence_tag<AssociativeSequence>::type >
32         ::template apply<AssociativeSequence,Key>
33 {
34     BOOST_MPL_AUX_LAMBDA_SUPPORT(2,has_key,(AssociativeSequence,Key))
35 };
36 
37 BOOST_MPL_AUX_NA_SPEC(2, has_key)
38 
39 }}
40 
41 #endif // BOOST_MPL_HAS_KEY_HPP_INCLUDED
42