ceph/src/boost/libs/hana/test/set/unpack.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/assert.hpp>
   6 #include <boost/hana/contains.hpp>
   7 #include <boost/hana/permutations.hpp>
   8 #include <boost/hana/set.hpp>
   9 #include <boost/hana/transform.hpp>
  10 #include <boost/hana/tuple.hpp>
  11 #include <boost/hana/unpack.hpp>
  12
  13 #include <laws/base.hpp>
  14 namespace hana = boost::hana;
  15 using hana::test::ct_eq;
  16
  17
  18 int main() {
  19     hana::test::_injection<0> f{};
  20
  21     auto check = [=](auto ...xs) {
  22         auto arg_perms = hana::permutations(hana::make_tuple(xs...));
  23         auto possible_results = hana::transform(arg_perms, [=](auto args) {
  24             return hana::unpack(args, f);
  25         });
  26
  27         BOOST_HANA_CONSTANT_CHECK(hana::contains(
  28             possible_results,
  29             hana::unpack(hana::make_set(xs...), f)
  30         ));
  31     };
  32
  33     check();
  34     check(ct_eq<1>{});
  35     check(ct_eq<1>{}, ct_eq<2>{});
  36     check(ct_eq<1>{}, ct_eq<2>{}, ct_eq<3>{});
  37     check(ct_eq<1>{}, ct_eq<2>{}, ct_eq<3>{}, ct_eq<4>{});
  38 }