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

   1 // Copyright Louis Dionne 2013-2016
   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_COMPARABLE_HPP
   6 #define BOOST_HANA_EXAMPLE_CPPCON_2014_MATRIX_COMPARABLE_HPP
   7
   8 #include "matrix.hpp"
   9
  10 #include <boost/hana/all.hpp>
  11 #include <boost/hana/bool.hpp>
  12 #include <boost/hana/equal.hpp>
  13 #include <boost/hana/eval_if.hpp>
  14 #include <boost/hana/zip_with.hpp>
  15
  16
  17 namespace boost { namespace hana {
  18     template <unsigned R1, unsigned C1, unsigned R2, unsigned C2>
  19     struct equal_impl<cppcon::Matrix<R1, C1>, cppcon::Matrix<R2, C2>> {
  20         template <typename M1, typename M2>
  21         static constexpr auto apply(M1 const& m1, M2 const& m2) {
  22             return eval_if(bool_c<R1 == R2 && C1 == C2>,
  23                 [&](auto _) {
  24                     return all(zip_with(_(equal), cppcon::rows(m1),
  25                                                   cppcon::rows(m2)));
  26                 },
  27                 [] { return false_c; }
  28             );
  29         }
  30     };
  31 }}
  32
  33 #endif // !BOOST_HANA_EXAMPLE_CPPCON_2014_MATRIX_COMPARABLE_HPP