1 

     2 #ifndef BOOST_MPL_IDENTITY_HPP_INCLUDED

     3 #define BOOST_MPL_IDENTITY_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: identity.hpp 49267 2008-10-11 06:19:02Z agurtovoy $

    14 // $Date: 2008-10-11 02:19:02 -0400 (Sat, 11 Oct 2008) $

    15 // $Revision: 49267 $

    16 

    17 #include <boost/mpl/aux_/na_spec.hpp>

    18 #include <boost/mpl/aux_/lambda_support.hpp>

    19 

    20 namespace boost { namespace mpl {

    21 

    22 template<

    23       typename BOOST_MPL_AUX_NA_PARAM(T)

    24     >

    25 struct identity

    26 {

    27     typedef T type;

    28     BOOST_MPL_AUX_LAMBDA_SUPPORT(1, identity, (T))

    29 };

    30 

    31 template<

    32       typename BOOST_MPL_AUX_NA_PARAM(T)

    33     >

    34 struct make_identity

    35 {

    36     typedef identity<T> type;

    37     BOOST_MPL_AUX_LAMBDA_SUPPORT(1, make_identity, (T))

    38 };

    39 

    40 BOOST_MPL_AUX_NA_SPEC_NO_ETI(1, identity)

    41 BOOST_MPL_AUX_NA_SPEC_NO_ETI(1, make_identity)

    42 

    43 }}

    44 

    45 #endif // BOOST_MPL_IDENTITY_HPP_INCLUDED