ceph/src/boost/libs/hana/test/ext/std/integer_sequence/drop_front_exactly.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/drop_front_exactly.hpp>
   7 #include <boost/hana/equal.hpp>
   8 #include <boost/hana/ext/std/integer_sequence.hpp>
   9 #include <boost/hana/integral_constant.hpp>
  10
  11 #include <utility>
  12 namespace hana = boost::hana;
  13
  14
  15 int main() {
  16     BOOST_HANA_CONSTANT_CHECK(hana::equal(
  17         hana::drop_front_exactly(std::index_sequence<0>{}),
  18         std::index_sequence<>{}
  19     ));
  20     BOOST_HANA_CONSTANT_CHECK(hana::equal(
  21         hana::drop_front_exactly(std::index_sequence<0, 1>{}),
  22         std::index_sequence<1>{}
  23     ));
  24     BOOST_HANA_CONSTANT_CHECK(hana::equal(
  25         hana::drop_front_exactly(std::index_sequence<0, 1, 2>{}),
  26         std::index_sequence<1, 2>{}
  27     ));
  28
  29
  30     BOOST_HANA_CONSTANT_CHECK(hana::equal(
  31         hana::drop_front_exactly(std::index_sequence<0, 1, 2>{}, hana::size_c<2>),
  32         std::index_sequence<2>{}
  33     ));
  34
  35     BOOST_HANA_CONSTANT_CHECK(hana::equal(
  36         hana::drop_front_exactly(std::index_sequence<0, 1, 2, 3>{}, hana::size_c<2>),
  37         std::index_sequence<2, 3>{}
  38     ));
  39
  40     BOOST_HANA_CONSTANT_CHECK(hana::equal(
  41         hana::drop_front_exactly(std::index_sequence<0, 1, 2, 3>{}, hana::size_c<3>),
  42         std::index_sequence<3>{}
  43     ));
  44 }