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- // Copyright Aleksey Gurtovoy 2001-2004
- //
- // Distributed under the Boost Software License, Version 1.0.
- // (See accompanying file LICENSE_1_0.txt or copy at
- // http://www.boost.org/LICENSE_1_0.txt)
- //
- // See http://www.boost.org/libs/mpl for documentation.
- // $Id$
- // $Date$
- // $Revision$
- #include <boost/mpl/multiplies.hpp>
- #include <boost/mpl/list.hpp>
- #include <boost/mpl/lower_bound.hpp>
- #include <boost/mpl/transform_view.hpp>
- #include <boost/mpl/sizeof.hpp>
- #include <boost/mpl/int.hpp>
- #include <boost/mpl/identity.hpp>
- #include <boost/mpl/base.hpp>
- #include <boost/mpl/eval_if.hpp>
- #include <boost/mpl/deref.hpp>
- #include <boost/mpl/begin_end.hpp>
- #include <boost/mpl/assert.hpp>
- #include <boost/type_traits/is_same.hpp>
- namespace mpl = boost::mpl;
- using namespace mpl::placeholders;
- template< int bit_size >
- class big_int
- {
- // ...
- };
- template< int bit_size >
- struct integer
- {
- typedef mpl::list<char,short,int,long> builtins_;
- typedef typename mpl::base< typename mpl::lower_bound<
- mpl::transform_view< builtins_
- , mpl::multiplies< mpl::sizeof_<_1>, mpl::int_<8> >
- >
- , mpl::int_<bit_size>
- >::type >::type iter_;
- typedef typename mpl::end<builtins_>::type last_;
- typedef typename mpl::eval_if<
- boost::is_same<iter_,last_>
- , mpl::identity< big_int<bit_size> >
- , mpl::deref<iter_>
- >::type type;
- };
- typedef integer<1>::type int1;
- typedef integer<5>::type int5;
- typedef integer<15>::type int15;
- typedef integer<32>::type int32;
- typedef integer<100>::type int100;
- BOOST_MPL_ASSERT(( boost::is_same< int1, char > ));
- BOOST_MPL_ASSERT(( boost::is_same< int5, char > ));
- BOOST_MPL_ASSERT(( boost::is_same< int15, short > ));
- BOOST_MPL_ASSERT(( boost::is_same< int32, int > ));
- BOOST_MPL_ASSERT(( boost::is_same< int100, big_int<100> > ));
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