text: // Copyright Louis Dionne 2013-2016
  // Distributed under the Boost Software License, Version 1.0.
  // (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
  
  #ifndef BOOST_HANA_TEST_AUTO_PARTITION_HPP
  #define BOOST_HANA_TEST_AUTO_PARTITION_HPP
  
  #include <boost/hana/assert.hpp>
  #include <boost/hana/contains.hpp>
  #include <boost/hana/equal.hpp>
  #include <boost/hana/partition.hpp>
  
  #include "test_case.hpp"
  #include <laws/base.hpp>
  #include <support/minimal_product.hpp>
  
  
  TestCase test_partition{[]{
      namespace hana = boost::hana;
      using hana::test::ct_eq;
  
      struct undefined { };
  
      auto pair = ::minimal_product;
      auto pred = hana::in ^ MAKE_TUPLE(ct_eq<-1>{}, ct_eq<-2>{}, ct_eq<-3>{}, ct_eq<-4>{}, ct_eq<-5>{});
  
      BOOST_HANA_CONSTANT_CHECK(hana::equal(
          hana::partition(MAKE_TUPLE(), undefined{}),
          pair(MAKE_TUPLE(), MAKE_TUPLE())
      ));
      BOOST_HANA_CONSTANT_CHECK(hana::equal(
          hana::partition(MAKE_TUPLE(ct_eq<0>{}), pred),
          pair(MAKE_TUPLE(),
               MAKE_TUPLE(ct_eq<0>{}))
      ));
      BOOST_HANA_CONSTANT_CHECK(hana::equal(
          hana::partition(MAKE_TUPLE(ct_eq<0>{}, ct_eq<1>{}), pred),
          pair(MAKE_TUPLE(),
               MAKE_TUPLE(ct_eq<0>{}, ct_eq<1>{}))
      ));
      BOOST_HANA_CONSTANT_CHECK(hana::equal(
          hana::partition(MAKE_TUPLE(ct_eq<-1>{}), pred),
          pair(MAKE_TUPLE(ct_eq<-1>{}),
               MAKE_TUPLE())
      ));
      BOOST_HANA_CONSTANT_CHECK(hana::equal(
          hana::partition(MAKE_TUPLE(ct_eq<-1>{}, ct_eq<0>{}, ct_eq<2>{}), pred),
          pair(MAKE_TUPLE(ct_eq<-1>{}),
               MAKE_TUPLE(ct_eq<0>{}, ct_eq<2>{}))
      ));
      BOOST_HANA_CONSTANT_CHECK(hana::equal(
          hana::partition(MAKE_TUPLE(ct_eq<0>{}, ct_eq<-3>{}, ct_eq<2>{}, ct_eq<-5>{}, ct_eq<6>{}), pred),
          pair(MAKE_TUPLE(ct_eq<-3>{}, ct_eq<-5>{}),
               MAKE_TUPLE(ct_eq<0>{}, ct_eq<2>{}, ct_eq<6>{}))
      ));
      BOOST_HANA_CONSTANT_CHECK(hana::equal(
          hana::partition(MAKE_TUPLE(ct_eq<-1>{}, ct_eq<2>{}, ct_eq<-3>{}, ct_eq<0>{}, ct_eq<-3>{}, ct_eq<4>{}), pred),
          pair(MAKE_TUPLE(ct_eq<-1>{}, ct_eq<-3>{}, ct_eq<-3>{}),
               MAKE_TUPLE(ct_eq<2>{}, ct_eq<0>{}, ct_eq<4>{}))
      ));
  
      // partition.by
      BOOST_HANA_CONSTANT_CHECK(hana::equal(
          hana::partition.by(pred, MAKE_TUPLE(ct_eq<-1>{}, ct_eq<0>{}, ct_eq<2>{})),
          hana::partition(MAKE_TUPLE(ct_eq<-1>{}, ct_eq<0>{}, ct_eq<2>{}), pred)
      ));
  
      BOOST_HANA_CONSTANT_CHECK(hana::equal(
          hana::partition.by(pred)(MAKE_TUPLE(ct_eq<-1>{}, ct_eq<0>{}, ct_eq<2>{})),
          hana::partition(MAKE_TUPLE(ct_eq<-1>{}, ct_eq<0>{}, ct_eq<2>{}), pred)
      ));
  }};
  
  #endif // !BOOST_HANA_TEST_AUTO_PARTITION_HPP
  