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- // Copyright Louis Dionne 2013-2017
- // Distributed under the Boost Software License, Version 1.0.
- // (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
- #include <boost/hana/assert.hpp>
- #include <boost/hana/equal.hpp>
- #include <boost/hana/ext/std/integer_sequence.hpp>
- #include <boost/hana/ext/std/integral_constant.hpp>
- #include <boost/hana/find_if.hpp>
- #include <boost/hana/optional.hpp>
- #include <cstddef>
- #include <type_traits>
- #include <utility>
- namespace hana = boost::hana;
- struct undefined { };
- int main() {
- BOOST_HANA_CONSTANT_CHECK(hana::equal(
- hana::find_if(std::index_sequence<>{},
- hana::equal.to(undefined{})),
- hana::nothing
- ));
- BOOST_HANA_CONSTANT_CHECK(hana::equal(
- hana::find_if(std::index_sequence<0>{},
- hana::equal.to(std::integral_constant<std::size_t, 0>{})),
- hana::just(std::integral_constant<std::size_t, 0>{})
- ));
- BOOST_HANA_CONSTANT_CHECK(hana::equal(
- hana::find_if(std::index_sequence<0>{},
- hana::equal.to(std::integral_constant<std::size_t, 1>{})),
- hana::nothing
- ));
- BOOST_HANA_CONSTANT_CHECK(hana::equal(
- hana::find_if(std::index_sequence<0, 1>{},
- hana::equal.to(std::integral_constant<std::size_t, 0>{})),
- hana::just(std::integral_constant<std::size_t, 0>{})
- ));
- BOOST_HANA_CONSTANT_CHECK(hana::equal(
- hana::find_if(std::index_sequence<0, 1>{},
- hana::equal.to(std::integral_constant<std::size_t, 1>{})),
- hana::just(std::integral_constant<std::size_t, 1>{})
- ));
- BOOST_HANA_CONSTANT_CHECK(hana::equal(
- hana::find_if(std::index_sequence<0, 1>{},
- hana::equal.to(std::integral_constant<std::size_t, 2>{})),
- hana::nothing
- ));
- BOOST_HANA_CONSTANT_CHECK(hana::equal(
- hana::find_if(std::index_sequence<0, 1, 2>{},
- hana::equal.to(std::integral_constant<std::size_t, 0>{})),
- hana::just(std::integral_constant<std::size_t, 0>{})
- ));
- BOOST_HANA_CONSTANT_CHECK(hana::equal(
- hana::find_if(std::index_sequence<0, 1, 2>{},
- hana::equal.to(std::integral_constant<std::size_t, 1>{})),
- hana::just(std::integral_constant<std::size_t, 1>{})
- ));
- BOOST_HANA_CONSTANT_CHECK(hana::equal(
- hana::find_if(std::index_sequence<0, 1, 2>{},
- hana::equal.to(std::integral_constant<std::size_t, 2>{})),
- hana::just(std::integral_constant<std::size_t, 2>{})
- ));
- BOOST_HANA_CONSTANT_CHECK(hana::equal(
- hana::find_if(std::index_sequence<0, 1, 2>{},
- hana::equal.to(std::integral_constant<std::size_t, 3>{})),
- hana::nothing
- ));
- BOOST_HANA_CONSTANT_CHECK(hana::equal(
- hana::find_if(std::index_sequence<0, 1, 2, 3>{},
- hana::equal.to(std::integral_constant<std::size_t, 0>{})),
- hana::just(std::integral_constant<std::size_t, 0>{})
- ));
- BOOST_HANA_CONSTANT_CHECK(hana::equal(
- hana::find_if(std::index_sequence<0, 1, 2, 3>{},
- hana::equal.to(std::integral_constant<std::size_t, 1>{})),
- hana::just(std::integral_constant<std::size_t, 1>{})
- ));
- BOOST_HANA_CONSTANT_CHECK(hana::equal(
- hana::find_if(std::index_sequence<0, 1, 2, 3>{},
- hana::equal.to(std::integral_constant<std::size_t, 2>{})),
- hana::just(std::integral_constant<std::size_t, 2>{})
- ));
- BOOST_HANA_CONSTANT_CHECK(hana::equal(
- hana::find_if(std::index_sequence<0, 1, 2, 3>{},
- hana::equal.to(std::integral_constant<std::size_t, 3>{})),
- hana::just(std::integral_constant<std::size_t, 3>{})
- ));
- BOOST_HANA_CONSTANT_CHECK(hana::equal(
- hana::find_if(std::index_sequence<0, 1, 2, 3>{},
- hana::equal.to(std::integral_constant<std::size_t, 4>{})),
- hana::nothing
- ));
- }
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