ceph/src/boost/libs/hana/example/permutations.cpp

   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 #include <boost/hana/all_of.hpp>
   6 #include <boost/hana/assert.hpp>
   7 #include <boost/hana/config.hpp>
   8 #include <boost/hana/contains.hpp>
   9 #include <boost/hana/functional/curry.hpp>
  10 #include <boost/hana/permutations.hpp>
  11 #include <boost/hana/tuple.hpp>
  12 namespace hana = boost::hana;
  13
  14
  15 BOOST_HANA_CONSTEXPR_LAMBDA auto is_permutation_of = hana::curry<2>([](auto xs, auto perm) {
  16     return hana::contains(hana::permutations(xs), perm);
  17 });
  18
  19 int main() {
  20     BOOST_HANA_CONSTEXPR_CHECK(
  21         hana::all_of(
  22             hana::make_tuple(
  23                 hana::make_tuple('1', 2, 3.0),
  24                 hana::make_tuple('1', 3.0, 2),
  25                 hana::make_tuple(2, '1', 3.0),
  26                 hana::make_tuple(2, 3.0, '1'),
  27                 hana::make_tuple(3.0, '1', 2),
  28                 hana::make_tuple(3.0, 2, '1')
  29             ),
  30             is_permutation_of(hana::make_tuple('1', 2, 3.0))
  31         )
  32     );
  33 }