ceph/src/boost/libs/hana/test/map/find_if.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/find_if.hpp>
   8 #include <boost/hana/map.hpp>
   9 #include <boost/hana/optional.hpp>
  10
  11 #include <laws/base.hpp>
  12 #include <support/minimal_product.hpp>
  13 namespace hana = boost::hana;
  14
  15
  16 template <int i>
  17 auto key() { return hana::test::ct_eq<i>{}; }
  18
  19 template <int i>
  20 auto val() { return hana::test::ct_eq<-i>{}; }
  21
  22 template <int i, int j>
  23 auto p() { return ::minimal_product(key<i>(), val<j>()); }
  24
  25 int main() {
  26     BOOST_HANA_CONSTANT_CHECK(hana::equal(
  27         hana::find_if(hana::make_map(), hana::equal.to(key<1>())),
  28         hana::nothing
  29     ));
  30
  31     BOOST_HANA_CONSTANT_CHECK(hana::equal(
  32         hana::find_if(hana::make_map(p<1, 1>()), hana::equal.to(key<1>())),
  33         hana::just(val<1>())
  34     ));
  35     BOOST_HANA_CONSTANT_CHECK(hana::equal(
  36         hana::find_if(hana::make_map(p<1, 1>()), hana::equal.to(key<2>())),
  37         hana::nothing
  38     ));
  39
  40     BOOST_HANA_CONSTANT_CHECK(hana::equal(
  41         hana::find_if(hana::make_map(p<1, 1>(), p<2, 2>()), hana::equal.to(key<1>())),
  42         hana::just(val<1>())
  43     ));
  44     BOOST_HANA_CONSTANT_CHECK(hana::equal(
  45         hana::find_if(hana::make_map(p<1, 1>(), p<2, 2>()), hana::equal.to(key<2>())),
  46         hana::just(val<2>())
  47     ));
  48     BOOST_HANA_CONSTANT_CHECK(hana::equal(
  49         hana::find_if(hana::make_map(p<1, 1>(), p<2, 2>()), hana::equal.to(key<3>())),
  50         hana::nothing
  51     ));
  52 }