ceph/src/boost/libs/hana/example/cppcon_2014/matrix/functor.hpp

   1 // Copyright Louis Dionne 2013-2017
   2 // Distributed under the Boost Software License, Version 1.0.
   3 // (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
   4
   5 #ifndef BOOST_HANA_EXAMPLE_CPPCON_2014_MATRIX_FUNCTOR_HPP
   6 #define BOOST_HANA_EXAMPLE_CPPCON_2014_MATRIX_FUNCTOR_HPP
   7
   8 #include "matrix.hpp"
   9
  10 #include <boost/hana/functional/flip.hpp>
  11 #include <boost/hana/functional/partial.hpp>
  12 #include <boost/hana/concept/functor.hpp>
  13
  14 #include <utility>
  15
  16
  17 namespace boost { namespace hana {
  18     template <unsigned Rows, unsigned Columns>
  19     struct transform_impl<cppcon::Matrix<Rows, Columns>> {
  20         template <typename M, typename F>
  21         static constexpr decltype(auto) apply(M&& m, F&& f) {
  22             return unpack(
  23                 transform(
  24                     cppcon::rows(std::forward<M>(m)),
  25                     partial(flip(transform), std::forward<F>(f))
  26                 ),
  27                 cppcon::matrix
  28             );
  29         }
  30     };
  31 }}
  32
  33 #endif // !BOOST_HANA_EXAMPLE_CPPCON_2014_MATRIX_FUNCTOR_HPP