1 
2 #ifndef BOOST_MPL_O1_SIZE_HPP_INCLUDED
3 #define BOOST_MPL_O1_SIZE_HPP_INCLUDED
4 
5 // Copyright Aleksey Gurtovoy 2000-2004
6 //
7 // Distributed under the Boost Software License, Version 1.0.
8 // (See accompanying file LICENSE_1_0.txt or copy at
9 // http://www.boost.org/LICENSE_1_0.txt)
10 //
11 // See http://www.boost.org/libs/mpl for documentation.
12 
13 // $Id$
14 // $Date$
15 // $Revision$
16 
17 #include <boost/mpl/O1_size_fwd.hpp>
18 #include <boost/mpl/sequence_tag.hpp>
19 #include <boost/mpl/aux_/O1_size_impl.hpp>
20 #include <boost/mpl/aux_/na_spec.hpp>
21 #include <boost/mpl/aux_/lambda_support.hpp>
22 
23 namespace boost { namespace mpl {
24 
25 // returns sequence size if it's an O(1) operation; otherwise returns -1
26 template<
27       typename BOOST_MPL_AUX_NA_PARAM(Sequence)
28     >
29 struct O1_size
30     : O1_size_impl< typename sequence_tag<Sequence>::type >
31         ::template apply< Sequence >
32 {
33     BOOST_MPL_AUX_LAMBDA_SUPPORT(1, O1_size, (Sequence))
34 };
35 
36 BOOST_MPL_AUX_NA_SPEC(1, O1_size)
37 
38 }}
39 
40 #endif // BOOST_MPL_O1_SIZE_HPP_INCLUDED
41