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