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99 lines
2.5 KiB
99 lines
2.5 KiB
//////////////////////////////////////////////////////////////////// |
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// |
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// Copyright Vicente J. Botet Escriba 2010 |
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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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// |
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//////////////////////////////////////////////////////////////////// |
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#ifndef BOOST_MPL_LCM_HPP_INCLUDED |
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#define BOOST_MPL_LCM_HPP_INCLUDED |
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#include <boost/mpl/integral_c.hpp> |
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#include <boost/ratio/detail/mpl/abs.hpp> |
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#include <boost/mpl/aux_/largest_int.hpp> |
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#include <boost/mpl/aux_/na_spec.hpp> |
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#include <boost/mpl/aux_/lambda_support.hpp> |
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#include <boost/mpl/aux_/config/eti.hpp> |
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#include <boost/mpl/aux_/config/integral.hpp> |
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#include <boost/mpl/aux_/config/static_constant.hpp> |
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#if !defined(BOOST_MPL_CFG_NO_NESTED_VALUE_ARITHMETIC_2) \ |
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&& !defined(BOOST_MPL_PREPROCESSING_MODE) \ |
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&& ( defined(BOOST_MSVC) \ |
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|| BOOST_WORKAROUND(__EDG_VERSION__, <= 238) \ |
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) |
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# define BOOST_MPL_CFG_NO_NESTED_VALUE_ARITHMETIC_2 |
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#endif |
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namespace boost { namespace mpl { |
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template< typename Tag1, typename Tag2 > struct lcm_impl; |
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template< typename T > struct lcm_tag |
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{ |
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typedef typename T::tag type; |
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}; |
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template< |
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typename BOOST_MPL_AUX_NA_PARAM(N1) |
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, typename BOOST_MPL_AUX_NA_PARAM(N2) |
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> |
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struct lcm |
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: lcm_impl< |
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typename lcm_tag<N1>::type |
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, typename lcm_tag<N2>::type |
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>::template apply<N1, N2>::type |
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{ |
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BOOST_MPL_AUX_LAMBDA_SUPPORT(2, lcm, (N1, N2)) |
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}; |
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BOOST_MPL_AUX_NA_SPEC(2, lcm) |
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template< |
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typename T |
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, T n1 |
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, T n2 |
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> |
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struct lcm_c |
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: lcm<integral_c<T,n1>,integral_c<T,n2> > |
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{ |
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}; |
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namespace aux { |
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template< typename T1, T1 n1, bool n1_is_0, typename T2, T2 n2, bool n2_is_0 > |
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struct lcm_aux |
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: abs<integral_c< typename aux::largest_int<T1, T2>::type, |
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( n1 / gcd<integral_c<T1,n1>, integral_c<T2,n2> >::value * n2 ) |
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> > |
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{}; |
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template <typename T1, T1 n1, typename T2, T2 n2> |
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struct lcm_aux<T1, n1, false, T2, n2, true> : integral_c<T2, 0> |
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{}; |
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template <typename T1, T1 n1, typename T2, T2 n2, bool C> |
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struct lcm_aux<T1, n1, true, T2, n2, C> : integral_c<T1, 0> |
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{}; |
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} |
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template<> |
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struct lcm_impl<integral_c_tag, integral_c_tag> |
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{ |
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template< typename N1, typename N2 > struct apply |
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: abs<aux::lcm_aux< typename N1::value_type, N1::value, N1::value==0, |
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typename N2::value_type, N2::value, N2::value==0 > > |
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{ |
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}; |
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}; |
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}} |
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#endif // BOOST_MPL_LCM_HPP_INCLUDED
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