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// Copyright 2019 Peter Dimov.
//
// 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
#include <boost/mp11/algorithm.hpp>
#include <boost/mp11/list.hpp>
#include <boost/mp11/integral.hpp>
#include <boost/core/lightweight_test_trait.hpp>
using boost::mp11::mp_int;
template<class N> using mod_2 = mp_int<N::value % 2>;
template<class N> using mod_3 = mp_int<N::value % 3>;
template<class N> using mod_6 = mp_int<N::value % 6>;
using boost::mp11::mp_not;
using boost::mp11::mp_plus;
template<class T> using P1 = mp_not<mod_6<T>>;
template<class T1, class... T> using P2 = mp_not<mp_plus<T...>>;
using boost::mp11::mp_bool;
template<std::size_t N> struct second_is
{
template<class T1, class T2> using fn = mp_bool< T2::value == N >;
};
using boost::mp11::mp_first;
using boost::mp11::mp_filter_q;
using boost::mp11::mp_iota;
using boost::mp11::mp_size;
template<class L, std::size_t N> using at_c = mp_first< mp_filter_q< second_is<N>, L, mp_iota<mp_size<L>> > >;
int main()
{
using boost::mp11::mp_iota_c;
using boost::mp11::mp_filter;
using boost::mp11::mp_list;
using boost::mp11::mp_size_t;
using boost::mp11::mp_transform;
{
int const N = 12;
using L1 = mp_iota_c<N>;
using R1 = mp_filter<P1, L1>;
BOOST_TEST_TRAIT_TRUE((std::is_same<R1, mp_list<mp_size_t<0>, mp_size_t<6>>>));
using L2 = mp_transform<mod_2, L1>;
using L3 = mp_transform<mod_3, L1>;
using L6 = mp_transform<mod_6, L1>;
using R2 = mp_filter<P2, L1, L6>;
BOOST_TEST_TRAIT_TRUE((std::is_same<R2, mp_list<mp_size_t<0>, mp_size_t<6>>>));
using R3 = mp_filter<P2, L1, L2, L3>;
BOOST_TEST_TRAIT_TRUE((std::is_same<R3, mp_list<mp_size_t<0>, mp_size_t<6>>>));
}
{
int const N = 64;
int const M = 17;
using L1 = mp_iota_c<N>;
using R1 = at_c<L1, M>;
BOOST_TEST_TRAIT_TRUE((std::is_same<R1, mp_size_t<M>>));
}
return boost::report_errors();
}
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