ceph/src/boost/libs/hana/test/map/erase_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/equal.hpp>
   7 #include <boost/hana/erase_key.hpp>
   8 #include <boost/hana/map.hpp>
   9
  10 #include <laws/base.hpp>
  11 #include <support/minimal_product.hpp>
  12 namespace hana = boost::hana;
  13
  14
  15 template <int i>
  16 auto key() { return hana::test::ct_eq<i>{}; }
  17
  18 template <int i>
  19 auto val() { return hana::test::ct_eq<-i>{}; }
  20
  21 template <int i, int j>
  22 auto p() { return ::minimal_product(key<i>(), val<j>()); }
  23
  24 struct undefined { };
  25
  26 int main() {
  27     BOOST_HANA_CONSTANT_CHECK(hana::equal(
  28         hana::erase_key(hana::make_map(), undefined{}),
  29         hana::make_map()
  30     ));
  31
  32     BOOST_HANA_CONSTANT_CHECK(hana::equal(
  33         hana::erase_key(hana::make_map(p<1, 1>()), key<1>()),
  34         hana::make_map()
  35     ));
  36     BOOST_HANA_CONSTANT_CHECK(hana::equal(
  37         hana::erase_key(hana::make_map(p<1, 1>()), key<99>()),
  38         hana::make_map(p<1, 1>())
  39     ));
  40
  41     BOOST_HANA_CONSTANT_CHECK(hana::equal(
  42         hana::erase_key(hana::make_map(p<1, 1>(), p<2, 2>()), key<99>()),
  43         hana::make_map(p<1, 1>(), p<2, 2>())
  44     ));
  45     BOOST_HANA_CONSTANT_CHECK(hana::equal(
  46         hana::erase_key(hana::make_map(p<1, 1>(), p<2, 2>()), key<1>()),
  47         hana::make_map(p<2, 2>())
  48     ));
  49     BOOST_HANA_CONSTANT_CHECK(hana::equal(
  50         hana::erase_key(hana::make_map(p<1, 1>(), p<2, 2>()), key<2>()),
  51         hana::make_map(p<1, 1>())
  52     ));
  53
  54     BOOST_HANA_CONSTANT_CHECK(hana::equal(
  55         hana::erase_key(hana::make_map(p<1, 1>(), p<2, 2>(), p<3, 3>()), key<99>()),
  56         hana::make_map(p<1, 1>(), p<2, 2>(), p<3, 3>())
  57     ));
  58     BOOST_HANA_CONSTANT_CHECK(hana::equal(
  59         hana::erase_key(hana::make_map(p<1, 1>(), p<2, 2>(), p<3, 3>()), key<1>()),
  60         hana::make_map(p<2, 2>(), p<3, 3>())
  61     ));
  62     BOOST_HANA_CONSTANT_CHECK(hana::equal(
  63         hana::erase_key(hana::make_map(p<1, 1>(), p<2, 2>(), p<3, 3>()), key<2>()),
  64         hana::make_map(p<1, 1>(), p<3, 3>())
  65     ));
  66     BOOST_HANA_CONSTANT_CHECK(hana::equal(
  67         hana::erase_key(hana::make_map(p<1, 1>(), p<2, 2>(), p<3, 3>()), key<3>()),
  68         hana::make_map(p<1, 1>(), p<2, 2>())
  69     ));
  70 }