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42 lines
1.3 KiB
C++
42 lines
1.3 KiB
C++
/*
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@copyright Louis Dionne 2014
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Distributed under the Boost Software License, Version 1.0.
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(See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
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*/
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#ifndef BOOST_HANA_EXAMPLE_CPPCON_2014_MATRIX_MONOID_HPP
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#define BOOST_HANA_EXAMPLE_CPPCON_2014_MATRIX_MONOID_HPP
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#include "matrix.hpp"
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#include <boost/hana/integral.hpp>
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#include <boost/hana/monoid/mcd.hpp>
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#include <boost/hana/range/foldable.hpp>
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namespace boost { namespace hana {
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template <unsigned Rows, unsigned Columns>
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struct Monoid::instance<
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cppcon::Matrix<Rows, Columns>, cppcon::Matrix<Rows, Columns>
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> : Monoid::mcd {
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template <typename M1, typename M2>
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static constexpr decltype(auto) plus_impl(M1&& m1, M2&& m2) {
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return element_wise(plus)(
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std::forward<M1>(m1),
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std::forward<M2>(m2)
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);
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}
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static constexpr decltype(auto) zero_impl() {
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auto zero_row = unpack(range_c<int, 0, Columns>, [](auto ...x) {
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return cppcon::row((x, int_<0>)...);
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});
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return unpack(range_c<int, 0, Rows>, [=](auto ...x) {
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return cppcon::matrix((x, zero_row)...);
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});
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}
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};
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}}
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#endif // !BOOST_HANA_EXAMPLE_CPPCON_2014_MATRIX_MONOID_HPP
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