ceph/src/boost/libs/hana/test/tuple/special.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/tuple.hpp>
   9 namespace hana = boost::hana;
  10
  11
  12 struct x0;
  13 struct x1;
  14 struct x2;
  15
  16 int main() {
  17     // tuple_t
  18     BOOST_HANA_CONSTANT_CHECK(hana::equal(
  19         hana::drop_front_exactly(hana::tuple_t<x0>),
  20         hana::tuple_t<>
  21     ));
  22     BOOST_HANA_CONSTANT_CHECK(hana::equal(
  23         hana::drop_front_exactly(hana::tuple_t<x0, x1>),
  24         hana::tuple_t<x1>
  25     ));
  26     BOOST_HANA_CONSTANT_CHECK(hana::equal(
  27         hana::drop_front_exactly(hana::tuple_t<x0, x1, x2>),
  28         hana::tuple_t<x1, x2>
  29     ));
  30
  31     // tuple_c
  32     BOOST_HANA_CONSTANT_CHECK(hana::equal(
  33         hana::drop_front_exactly(hana::tuple_c<int, 0>),
  34         hana::tuple_c<int>
  35     ));
  36
  37     BOOST_HANA_CONSTANT_CHECK(hana::equal(
  38         hana::drop_front_exactly(hana::tuple_c<int, 0, 1>),
  39         hana::tuple_c<int, 1>
  40     ));
  41
  42     BOOST_HANA_CONSTANT_CHECK(hana::equal(
  43         hana::drop_front_exactly(hana::tuple_c<int, 0, 1, 2>),
  44         hana::tuple_c<int, 1, 2>
  45     ));
  46 }