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125 lines
3.6 KiB
C++
125 lines
3.6 KiB
C++
////////////////////////////////////////////////////////////////////
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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_GCD_HPP_INCLUDED
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#define BOOST_MPL_GCD_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/integral.hpp>
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#include <boost/mpl/aux_/config/static_constant.hpp>
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#include <boost/mpl/aux_/config/dependent_nttp.hpp>
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#include <boost/cstdint.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(__CUDACC__) \
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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 gcd_impl;
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template< typename T > struct gcd_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 gcd
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: gcd_impl<
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typename gcd_tag<N1>::type
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, typename gcd_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, gcd, (N1, N2))
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};
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BOOST_MPL_AUX_NA_SPEC(2, gcd)
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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 gcd_c
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: gcd<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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// Workaround for error: the type of partial specialization template parameter constant "n2"
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// depends on another template parameter
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// Note: this solution could be wrong for n1 or n2 = [2**63 .. 2**64-1]
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#if defined(BOOST_MPL_CFG_NO_DEPENDENT_NONTYPE_PARAMETER_IN_PARTIAL_SPEC)
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template< typename T1, boost::intmax_t n1, bool n1_is_0
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, typename T2, boost::intmax_t n2, bool n2_is_0 >
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struct gcd_aux
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: gcd_aux<T2, n2, n2==0, T1, (n1 % n2), (n1 % n2)==0>
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{};
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template <typename T1, boost::intmax_t n1, typename T2, boost::intmax_t n2>
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struct gcd_aux<T1, n1, false, T2, n2, true> : integral_c<T1, n1>
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{};
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template <typename T1, boost::intmax_t n1, typename T2, boost::intmax_t n2, bool C>
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struct gcd_aux<T1, n1, true, T2, n2, C> : integral_c<T2, n2>
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{};
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#else // defined(BOOST_MPL_CFG_NO_DEPENDENT_NONTYPE_PARAMETER_IN_PARTIAL_SPEC)
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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 gcd_aux
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: gcd_aux<T2, n2, n2==0,
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typename aux::largest_int<T1, T2>::type,
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//~ T1,
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(n1 % n2), (n1 % n2)==0>
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{};
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template <typename T1, T1 n1, typename T2, T2 n2>
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struct gcd_aux<T1, n1, false, T2, n2, true> : integral_c<T1, n1>
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{};
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template <typename T1, T1 n1, typename T2, T2 n2, bool C>
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struct gcd_aux<T1, n1, true, T2, n2, C> : integral_c<T2, n2>
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{};
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#endif // defined(BOOST_MPL_CFG_NO_DEPENDENT_NONTYPE_PARAMETER_IN_PARTIAL_SPEC)
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}
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template<>
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struct gcd_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::gcd_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_GCD_HPP_INCLUDED
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