ceph/src/boost/libs/hana/test/map/at_key.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/at_key.hpp>
   7 #include <boost/hana/equal.hpp>
   8 #include <boost/hana/map.hpp>
   9
  10 #include <laws/base.hpp>
  11 #include <support/minimal_product.hpp>
  12
  13 #include <utility>
  14 namespace hana = boost::hana;
  15
  16
  17 template <int i>
  18 auto key() { return hana::test::ct_eq<i>{}; }
  19
  20 template <int i>
  21 auto val() { return hana::test::ct_eq<-i>{}; }
  22
  23 template <int i, int j>
  24 auto p() { return ::minimal_product(key<i>(), val<j>()); }
  25
  26 int main() {
  27     BOOST_HANA_CONSTANT_CHECK(hana::equal(
  28         hana::at_key(hana::make_map(p<0, 0>()), key<0>()),
  29         val<0>()
  30     ));
  31
  32     BOOST_HANA_CONSTANT_CHECK(hana::equal(
  33         hana::at_key(hana::make_map(p<0, 0>(), p<1,1>()), key<0>()),
  34         val<0>()
  35     ));
  36     BOOST_HANA_CONSTANT_CHECK(hana::equal(
  37         hana::at_key(hana::make_map(p<0, 0>(), p<1,1>()), key<1>()),
  38         val<1>()
  39     ));
  40
  41     BOOST_HANA_CONSTANT_CHECK(hana::equal(
  42         hana::at_key(hana::make_map(p<0, 0>(), p<1,1>(), p<2,2>()), key<0>()),
  43         val<0>()
  44     ));
  45     BOOST_HANA_CONSTANT_CHECK(hana::equal(
  46         hana::at_key(hana::make_map(p<0, 0>(), p<1,1>(), p<2,2>()), key<1>()),
  47         val<1>()
  48     ));
  49     BOOST_HANA_CONSTANT_CHECK(hana::equal(
  50         hana::at_key(hana::make_map(p<0, 0>(), p<1,1>(), p<2,2>()), key<2>()),
  51         val<2>()
  52     ));
  53
  54     // check operators
  55     auto m = hana::make_map(p<2, 2>(), p<1, 1>());
  56     auto const const_m = hana::make_map(p<2, 2>(), p<1, 1>());
  57     BOOST_HANA_CONSTANT_CHECK(hana::equal(m[key<1>()], val<1>()));
  58     BOOST_HANA_CONSTANT_CHECK(hana::equal(const_m[key<1>()], val<1>()));
  59     BOOST_HANA_CONSTANT_CHECK(hana::equal(std::move(m)[key<1>()], val<1>()));
  60 }