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69 lines
2.2 KiB
C++
69 lines
2.2 KiB
C++
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//-----------------------------------------------------------------------------
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// boost mpl/example/integer.cpp source file
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// See http://www.boost.org for updates, documentation, and revision history.
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//-----------------------------------------------------------------------------
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//
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// Copyright (c) 2001-02
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// Aleksey Gurtovoy
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//
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// Permission to use, copy, modify, distribute and sell this software
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// and its documentation for any purpose is hereby granted without fee,
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// provided that the above copyright notice appears in all copies and
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// that both the copyright notice and this permission notice appear in
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// supporting documentation. No representations are made about the
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// suitability of this software for any purpose. It is provided "as is"
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// without express or implied warranty.
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#include "boost/mpl/arithmetic/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_c.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/apply_if.hpp"
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#include "boost/mpl/apply.hpp"
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#include "boost/mpl/begin_end.hpp"
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#include "boost/mpl/assert_is_same.hpp"
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namespace mpl = boost::mpl;
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using namespace mpl::placeholder;
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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_c<8> >
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>
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, mpl::int_c<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::apply_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::apply0<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_IS_SAME(int1, char);
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BOOST_MPL_ASSERT_IS_SAME(int5, char);
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BOOST_MPL_ASSERT_IS_SAME(int15, short);
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BOOST_MPL_ASSERT_IS_SAME(int32, int);
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BOOST_MPL_ASSERT_IS_SAME(int100, big_int<100>);
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