ceph/src/boost/libs/hana/test/experimental/view/sliced/length.cpp

   1 // Copyright Louis Dionne 2013-2017
   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/equal.hpp>
   7 #include <boost/hana/experimental/view.hpp>
   8 #include <boost/hana/integral_constant.hpp>
   9 #include <boost/hana/length.hpp>
  10 #include <boost/hana/tuple.hpp>
  11
  12 #include <support/seq.hpp>
  13 namespace hana = boost::hana;
  14
  15
  16 template <int> struct undefined { };
  17
  18 int main() {
  19     auto container = ::seq;
  20
  21     {
  22         auto storage = container();
  23         auto sliced = hana::experimental::sliced(storage, hana::tuple_c<int>);
  24         BOOST_HANA_CONSTANT_CHECK(hana::equal(
  25             hana::length(sliced),
  26             hana::size_c<0>
  27         ));
  28     }
  29
  30     {
  31         auto storage = container(undefined<0>{});
  32         auto sliced = hana::experimental::sliced(storage, hana::tuple_c<int, 0>);
  33         BOOST_HANA_CONSTANT_CHECK(hana::equal(
  34             hana::length(sliced),
  35             hana::size_c<1>
  36         ));
  37     }{
  38         auto storage = container(undefined<0>{});
  39         auto sliced = hana::experimental::sliced(storage, hana::tuple_c<int>);
  40         BOOST_HANA_CONSTANT_CHECK(hana::equal(
  41             hana::length(sliced),
  42             hana::size_c<0>
  43         ));
  44     }
  45
  46     {
  47         auto storage = container(undefined<0>{}, undefined<1>{});
  48         auto sliced = hana::experimental::sliced(storage, hana::tuple_c<int, 0>);
  49         BOOST_HANA_CONSTANT_CHECK(hana::equal(
  50             hana::length(sliced),
  51             hana::size_c<1>
  52         ));
  53     }{
  54         auto storage = container(undefined<0>{}, undefined<1>{});
  55         auto sliced = hana::experimental::sliced(storage, hana::tuple_c<int, 0, 1>);
  56         BOOST_HANA_CONSTANT_CHECK(hana::equal(
  57             hana::length(sliced),
  58             hana::size_c<2>
  59         ));
  60     }{
  61         auto storage = container(undefined<0>{}, undefined<1>{});
  62         auto sliced = hana::experimental::sliced(storage, hana::tuple_c<int, 0, 0>);
  63         BOOST_HANA_CONSTANT_CHECK(hana::equal(
  64             hana::length(sliced),
  65             hana::size_c<2>
  66         ));
  67     }
  68 }