ceph/src/boost/libs/hana/test/experimental/view/joined/is_empty.cpp

   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 #include <boost/hana/assert.hpp>
   6 #include <boost/hana/experimental/view.hpp>
   7 #include <boost/hana/is_empty.hpp>
   8 #include <boost/hana/not.hpp>
   9
  10 #include <support/seq.hpp>
  11 namespace hana = boost::hana;
  12
  13
  14 template <int> struct undefined { };
  15
  16 int main() {
  17     auto container = ::seq;
  18
  19     {
  20         auto storage1 = container();
  21         auto storage2 = container();
  22         auto joined = hana::experimental::joined(storage1, storage2);
  23         BOOST_HANA_CONSTANT_CHECK(hana::is_empty(joined));
  24     }
  25     {
  26         auto storage1 = container(undefined<0>{});
  27         auto storage2 = container();
  28         auto joined = hana::experimental::joined(storage1, storage2);
  29         BOOST_HANA_CONSTANT_CHECK(hana::not_(hana::is_empty(joined)));
  30     }
  31     {
  32         auto storage1 = container(undefined<0>{});
  33         auto storage2 = container(undefined<1>{});
  34         auto joined = hana::experimental::joined(storage1, storage2);
  35         BOOST_HANA_CONSTANT_CHECK(hana::not_(hana::is_empty(joined)));
  36     }
  37     {
  38         auto storage1 = container();
  39         auto storage2 = container(undefined<0>{});
  40         auto joined = hana::experimental::joined(storage1, storage2);
  41         BOOST_HANA_CONSTANT_CHECK(hana::not_(hana::is_empty(joined)));
  42     }
  43 }