ceph/src/boost/libs/hana/test/_include/auto/at.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_AT_HPP
   6 #define BOOST_HANA_TEST_AUTO_AT_HPP
   7
   8 #include <boost/hana/assert.hpp>
   9 #include <boost/hana/at.hpp>
  10 #include <boost/hana/equal.hpp>
  11 #include <boost/hana/integral_constant.hpp>
  12
  13 #include "test_case.hpp"
  14 #include <laws/base.hpp>
  15 #include <support/tracked.hpp>
  16
  17
  18 namespace _test_at_detail { template <int> struct invalid { }; }
  19
  20
  21 TestCase test_at{[]{
  22     namespace hana = boost::hana;
  23     using hana::test::ct_eq;
  24     using _test_at_detail::invalid;
  25
  26     BOOST_HANA_CONSTANT_CHECK(hana::equal(
  27         hana::at(MAKE_TUPLE(ct_eq<0>{}), hana::size_c<0>),
  28         ct_eq<0>{}
  29     ));
  30     BOOST_HANA_CONSTANT_CHECK(hana::equal(
  31         hana::at(MAKE_TUPLE(ct_eq<0>{}, invalid<1>{}), hana::size_c<0>),
  32         ct_eq<0>{}
  33     ));
  34
  35     BOOST_HANA_CONSTANT_CHECK(hana::equal(
  36         hana::at(MAKE_TUPLE(invalid<0>{}, ct_eq<1>{}), hana::size_c<1>),
  37         ct_eq<1>{}
  38     ));
  39     BOOST_HANA_CONSTANT_CHECK(hana::equal(
  40         hana::at(MAKE_TUPLE(invalid<0>{}, ct_eq<1>{}, invalid<2>{}), hana::size_c<1>),
  41         ct_eq<1>{}
  42     ));
  43
  44     BOOST_HANA_CONSTANT_CHECK(hana::equal(
  45         hana::at(MAKE_TUPLE(invalid<0>{}, invalid<1>{}, ct_eq<2>{}), hana::size_c<2>),
  46         ct_eq<2>{}
  47     ));
  48     BOOST_HANA_CONSTANT_CHECK(hana::equal(
  49         hana::at(MAKE_TUPLE(invalid<0>{}, invalid<1>{}, ct_eq<2>{}, invalid<3>{}), hana::size_c<2>),
  50         ct_eq<2>{}
  51     ));
  52
  53 #ifndef MAKE_TUPLE_NO_CONSTEXPR
  54     static_assert(hana::equal(
  55         hana::at(MAKE_TUPLE(1), hana::size_c<0>),
  56         1
  57     ), "");
  58     static_assert(hana::equal(
  59         hana::at(MAKE_TUPLE(1, '2'), hana::size_c<0>),
  60         1
  61     ), "");
  62     static_assert(hana::equal(
  63         hana::at(MAKE_TUPLE(1, '2', 3.3), hana::size_c<0>),
  64         1
  65     ), "");
  66
  67     static_assert(hana::equal(
  68         hana::at(MAKE_TUPLE(1, '2'), hana::size_c<1>),
  69         '2'
  70     ), "");
  71     static_assert(hana::equal(
  72         hana::at(MAKE_TUPLE(1, '2', 3.3), hana::size_c<1>),
  73         '2'
  74     ), "");
  75
  76     static_assert(hana::equal(
  77         hana::at(MAKE_TUPLE(1, '2', 3.3), hana::size_c<2>),
  78         3.3
  79     ), "");
  80 #endif
  81
  82     // make sure we can use non-pods on both sides
  83     {
  84         // store the result to make sure `at` is executed.
  85         auto result = hana::at(MAKE_TUPLE(Tracked{0}, ct_eq<1>{}, Tracked{1}), hana::size_c<1>);;
  86         BOOST_HANA_CONSTANT_CHECK(hana::equal(result, ct_eq<1>{}));
  87     }
  88
  89 }};
  90
  91 #endif // !BOOST_HANA_TEST_AUTO_AT_HPP