ceph/src/boost/libs/hana/example/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/erase_key.hpp>
   7 #include <boost/hana/map.hpp>
   8 #include <boost/hana/pair.hpp>
   9 #include <boost/hana/string.hpp>
  10 #include <boost/hana/type.hpp>
  11
  12 #include <string>
  13 namespace hana = boost::hana;
  14 using namespace std::literals;
  15
  16
  17 int main() {
  18     auto m = hana::make_map(
  19         hana::make_pair(hana::type_c<int>, "abcd"s),
  20         hana::make_pair(hana::type_c<void>, 1234),
  21         hana::make_pair(BOOST_HANA_STRING("foobar!"), hana::type_c<char>)
  22     );
  23
  24     BOOST_HANA_RUNTIME_CHECK(
  25         hana::erase_key(m, BOOST_HANA_STRING("foobar!")) ==
  26         hana::make_map(
  27             hana::make_pair(hana::type_c<int>, "abcd"s),
  28             hana::make_pair(hana::type_c<void>, 1234)
  29         )
  30     );
  31
  32     BOOST_HANA_RUNTIME_CHECK(hana::erase_key(m, hana::type_c<char>) == m);
  33 }