ceph/src/boost/libs/hana/test/_include/auto/drop_back.hpp

   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 #ifndef BOOST_HANA_TEST_AUTO_DROP_BACK_HPP
   6 #define BOOST_HANA_TEST_AUTO_DROP_BACK_HPP
   7
   8 #include <boost/hana/assert.hpp>
   9 #include <boost/hana/drop_back.hpp>
  10 #include <boost/hana/equal.hpp>
  11 #include <boost/hana/integral_constant.hpp>
  12
  13 #include <laws/base.hpp>
  14 #include "test_case.hpp"
  15
  16
  17 TestCase test_drop_back{[]{
  18     namespace hana = boost::hana;
  19     using hana::test::ct_eq;
  20
  21     BOOST_HANA_CONSTANT_CHECK(hana::equal(
  22         hana::drop_back(MAKE_TUPLE(), hana::size_c<0>),
  23         MAKE_TUPLE()
  24     ));
  25     BOOST_HANA_CONSTANT_CHECK(hana::equal(
  26         hana::drop_back(MAKE_TUPLE(), hana::size_c<1>),
  27         MAKE_TUPLE()
  28     ));
  29     BOOST_HANA_CONSTANT_CHECK(hana::equal(
  30         hana::drop_back(MAKE_TUPLE(), hana::size_c<2>),
  31         MAKE_TUPLE()
  32     ));
  33
  34     BOOST_HANA_CONSTANT_CHECK(hana::equal(
  35         hana::drop_back(MAKE_TUPLE(ct_eq<0>{}), hana::size_c<0>),
  36         MAKE_TUPLE(ct_eq<0>{})
  37     ));
  38     BOOST_HANA_CONSTANT_CHECK(hana::equal(
  39         hana::drop_back(MAKE_TUPLE(ct_eq<0>{}), hana::size_c<1>),
  40         MAKE_TUPLE()
  41     ));
  42     BOOST_HANA_CONSTANT_CHECK(hana::equal(
  43         hana::drop_back(MAKE_TUPLE(ct_eq<0>{}), hana::size_c<2>),
  44         MAKE_TUPLE()
  45     ));
  46
  47     BOOST_HANA_CONSTANT_CHECK(hana::equal(
  48         hana::drop_back(MAKE_TUPLE(ct_eq<0>{}, ct_eq<1>{}), hana::size_c<0>),
  49         MAKE_TUPLE(ct_eq<0>{}, ct_eq<1>{})
  50     ));
  51     BOOST_HANA_CONSTANT_CHECK(hana::equal(
  52         hana::drop_back(MAKE_TUPLE(ct_eq<0>{}, ct_eq<1>{}), hana::size_c<1>),
  53         MAKE_TUPLE(ct_eq<0>{})
  54     ));
  55     BOOST_HANA_CONSTANT_CHECK(hana::equal(
  56         hana::drop_back(MAKE_TUPLE(ct_eq<0>{}, ct_eq<1>{}), hana::size_c<2>),
  57         MAKE_TUPLE()
  58     ));
  59
  60     BOOST_HANA_CONSTANT_CHECK(hana::equal(
  61         hana::drop_back(MAKE_TUPLE(ct_eq<0>{}, ct_eq<1>{}, ct_eq<2>{}), hana::size_c<0>),
  62         MAKE_TUPLE(ct_eq<0>{}, ct_eq<1>{}, ct_eq<2>{})
  63     ));
  64     BOOST_HANA_CONSTANT_CHECK(hana::equal(
  65         hana::drop_back(MAKE_TUPLE(ct_eq<0>{}, ct_eq<1>{}, ct_eq<2>{}), hana::size_c<1>),
  66         MAKE_TUPLE(ct_eq<0>{}, ct_eq<1>{})
  67     ));
  68     BOOST_HANA_CONSTANT_CHECK(hana::equal(
  69         hana::drop_back(MAKE_TUPLE(ct_eq<0>{}, ct_eq<1>{}, ct_eq<2>{}), hana::size_c<2>),
  70         MAKE_TUPLE(ct_eq<0>{})
  71     ));
  72     BOOST_HANA_CONSTANT_CHECK(hana::equal(
  73         hana::drop_back(MAKE_TUPLE(ct_eq<0>{}, ct_eq<1>{}, ct_eq<2>{}), hana::size_c<3>),
  74         MAKE_TUPLE()
  75     ));
  76
  77     // make sure hana::drop_back(xs) == hana::drop_back(xs, hana::size_c<1>)
  78     BOOST_HANA_CHECK(hana::equal(
  79         hana::drop_back(MAKE_TUPLE()),
  80         hana::drop_back(MAKE_TUPLE(), hana::size_c<1>)
  81     ));
  82
  83     BOOST_HANA_CHECK(hana::equal(
  84         hana::drop_back(MAKE_TUPLE(ct_eq<0>{})),
  85         hana::drop_back(MAKE_TUPLE(ct_eq<0>{}), hana::size_c<1>)
  86     ));
  87
  88     BOOST_HANA_CHECK(hana::equal(
  89         hana::drop_back(MAKE_TUPLE(ct_eq<0>{}, ct_eq<1>{})),
  90         hana::drop_back(MAKE_TUPLE(ct_eq<0>{}, ct_eq<1>{}), hana::size_c<1>)
  91     ));
  92
  93     BOOST_HANA_CHECK(hana::equal(
  94         hana::drop_back(MAKE_TUPLE(ct_eq<0>{}, ct_eq<2>{})),
  95         hana::drop_back(MAKE_TUPLE(ct_eq<0>{}, ct_eq<2>{}), hana::size_c<1>)
  96     ));
  97 }};
  98
  99 #endif // !BOOST_HANA_TEST_AUTO_DROP_BACK_HPP