1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/os/ossrv/ossrv_pub/boost_apis/boost/iostreams/detail/select.hpp	Fri Jun 15 03:10:57 2012 +0200
     1.3 @@ -0,0 +1,79 @@
     1.4 +// (C) Copyright Jonathan Turkanis 2003.
     1.5 +// Distributed under the Boost Software License, Version 1.0. (See accompanying
     1.6 +// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt.)
     1.7 +
     1.8 +// See http://www.boost.org/libs/iostreams for documentation.
     1.9 +
    1.10 +// Contains the metafunction select, which mimics the effect of a chain of
    1.11 +// nested mpl if_'s.
    1.12 +//
    1.13 +// -----------------------------------------------------------------------------
    1.14 +//
    1.15 +// Usage:
    1.16 +//      
    1.17 +// typedef typename select<
    1.18 +//                      case1,  type1,
    1.19 +//                      case2,  type2,
    1.20 +//                      ...
    1.21 +//                      true_,  typen
    1.22 +//                  >::type selection;
    1.23 +//
    1.24 +// Here case1, case2, ... are models of MPL::IntegralConstant with value type
    1.25 +// bool, and n <= 10.
    1.26 +
    1.27 +#ifndef BOOST_IOSTREAMS_SELECT_HPP_INCLUDED
    1.28 +#define BOOST_IOSTREAMS_SELECT_HPP_INCLUDED   
    1.29 +
    1.30 +#if defined(_MSC_VER) && (_MSC_VER >= 1020)
    1.31 +# pragma once
    1.32 +#endif                  
    1.33 + 
    1.34 +#include <boost/type_traits/is_base_and_derived.hpp>
    1.35 +#include <boost/mpl/eval_if.hpp>
    1.36 +#include <boost/mpl/identity.hpp>
    1.37 +#include <boost/mpl/if.hpp>
    1.38 +#include <boost/mpl/void.hpp>
    1.39 +
    1.40 +namespace boost { namespace iostreams { 
    1.41 +
    1.42 +typedef mpl::true_ else_;
    1.43 +
    1.44 +template< typename Case1 = mpl::true_,
    1.45 +          typename Type1 = mpl::void_,
    1.46 +          typename Case2 = mpl::true_,
    1.47 +          typename Type2 = mpl::void_,
    1.48 +          typename Case3 = mpl::true_,
    1.49 +          typename Type3 = mpl::void_,
    1.50 +          typename Case4 = mpl::true_,
    1.51 +          typename Type4 = mpl::void_,
    1.52 +          typename Case5 = mpl::true_,
    1.53 +          typename Type5 = mpl::void_,
    1.54 +          typename Case6 = mpl::true_,
    1.55 +          typename Type6 = mpl::void_,
    1.56 +          typename Case7 = mpl::true_,
    1.57 +          typename Type7 = mpl::void_,
    1.58 +          typename Case8 = mpl::true_,
    1.59 +          typename Type8 = mpl::void_,
    1.60 +          typename Case9 = mpl::true_,
    1.61 +          typename Type9 = mpl::void_,
    1.62 +          typename Case10 = mpl::true_,
    1.63 +          typename Type10 = mpl::void_ >
    1.64 +struct select {
    1.65 +    typedef typename
    1.66 +            mpl::eval_if<
    1.67 +                Case1, mpl::identity<Type1>, mpl::eval_if<
    1.68 +                Case2, mpl::identity<Type2>, mpl::eval_if<
    1.69 +                Case3, mpl::identity<Type3>, mpl::eval_if<
    1.70 +                Case4, mpl::identity<Type4>, mpl::eval_if<
    1.71 +                Case5, mpl::identity<Type5>, mpl::eval_if<
    1.72 +                Case6, mpl::identity<Type6>, mpl::eval_if<
    1.73 +                Case7, mpl::identity<Type7>, mpl::eval_if<
    1.74 +                Case8, mpl::identity<Type8>, mpl::eval_if<
    1.75 +                Case9, mpl::identity<Type9>, mpl::if_<
    1.76 +                Case10, Type10, mpl::void_ > > > > > > > > >
    1.77 +            >::type type;
    1.78 +};
    1.79 +
    1.80 +} } // End namespaces iostreams, boost.
    1.81 +
    1.82 +#endif // #ifndef BOOST_IOSTREAMS_SELECT_HPP_INCLUDED