/*
@copyright Louis Dionne 2014
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/detail/assert.hpp>
#include <boost/hana/detail/constexpr.hpp>
#include <boost/hana/functional.hpp>
#include <boost/hana/integral.hpp>
#include <boost/hana/list/instance.hpp>
#include <boost/hana/pair.hpp>
using namespace boost::hana;


int main() {
    //! [main]
    BOOST_HANA_CONSTEXPR_LAMBDA auto xs = list(int_<1>, int_<2>, int_<3>, int_<4>);
    BOOST_HANA_CONSTANT_ASSERT(
        span(xs, _ < int_<3>)
        ==
        pair(list(int_<1>, int_<2>), list(int_<3>, int_<4>))
    );

    BOOST_HANA_CONSTANT_ASSERT(
        span(xs, _ < int_<0>)
        ==
        pair(list(), xs)
    );

    BOOST_HANA_CONSTANT_ASSERT(
        span(xs, _ < int_<5>)
        ==
        pair(xs, list())
    );
    //! [main]
}