boost/mpl/O1_size.hpp

0001
0002 #ifndef BOOST_MPL_O1_SIZE_HPP_INCLUDED
0003 #define BOOST_MPL_O1_SIZE_HPP_INCLUDED
0004
0005 // Copyright Aleksey Gurtovoy 2000-2004
0006 //
0007 // Distributed under the Boost Software License, Version 1.0.
0008 // (See accompanying file LICENSE_1_0.txt or copy at
0009 // http://www.boost.org/LICENSE_1_0.txt)
0010 //
0011 // See http://www.boost.org/libs/mpl for documentation.
0012
0013 // $Id$
0014 // $Date$
0015 // $Revision$
0016
0017 #include <boost/mpl/O1_size_fwd.hpp>
0018 #include <boost/mpl/sequence_tag.hpp>
0019 #include <boost/mpl/aux_/O1_size_impl.hpp>
0020 #include <boost/mpl/aux_/na_spec.hpp>
0021 #include <boost/mpl/aux_/lambda_support.hpp>
0022
0023 namespace boost { namespace mpl {
0024
0025 // returns sequence size if it's an O(1) operation; otherwise returns -1
0026 template<
0027       typename BOOST_MPL_AUX_NA_PARAM(Sequence)
0028     >
0029 struct O1_size
0030     : O1_size_impl< typename sequence_tag<Sequence>::type >
0031         ::template apply< Sequence >
0032 {
0033     BOOST_MPL_AUX_LAMBDA_SUPPORT(1, O1_size, (Sequence))
0034 };
0035
0036 BOOST_MPL_AUX_NA_SPEC(1, O1_size)
0037
0038 }}
0039
0040 #endif // BOOST_MPL_O1_SIZE_HPP_INCLUDED