ceph/src/boost/libs/hana/example/partition.cpp

   1 // Copyright Louis Dionne 2013-2016
   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/ext/std/integral_constant.hpp>
   8 #include <boost/hana/integral_constant.hpp>
   9 #include <boost/hana/mod.hpp>
  10 #include <boost/hana/not_equal.hpp>
  11 #include <boost/hana/pair.hpp>
  12 #include <boost/hana/partition.hpp>
  13 #include <boost/hana/tuple.hpp>
  14 #include <boost/hana/type.hpp>
  15
  16 #include <type_traits>
  17 namespace hana = boost::hana;
  18
  19
  20 BOOST_HANA_CONSTANT_CHECK(
  21     hana::partition(hana::tuple_c<int, 1, 2, 3, 4, 5, 6, 7>, [](auto x) {
  22         return x % hana::int_c<2> != hana::int_c<0>;
  23     })
  24     ==
  25     hana::make_pair(
  26         hana::tuple_c<int, 1, 3, 5, 7>,
  27         hana::tuple_c<int, 2, 4, 6>
  28     )
  29 );
  30
  31 BOOST_HANA_CONSTANT_CHECK(
  32     hana::partition(hana::tuple_t<void, int, float, char, double>, hana::trait<std::is_floating_point>)
  33     ==
  34     hana::make_pair(
  35         hana::tuple_t<float, double>,
  36         hana::tuple_t<void, int, char>
  37     )
  38 );
  39
  40
  41 // partition.by is syntactic sugar
  42 BOOST_HANA_CONSTANT_CHECK(
  43     hana::partition.by(hana::trait<std::is_floating_point>,
  44                        hana::tuple_t<void, int, float, char, double>)
  45     ==
  46     hana::make_pair(
  47         hana::tuple_t<float, double>,
  48         hana::tuple_t<void, int, char>
  49     )
  50 );
  51
  52 int main() { }