/*
@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/assert.hpp>
#include <boost/hana/detail/constexpr.hpp>
#include <boost/hana/functional.hpp>
using namespace boost::hana;


int main() {
    //! [main]
    BOOST_HANA_CONSTEXPR_LAMBDA auto plus = _ + _;
    BOOST_HANA_CONSTEXPR_CHECK(plus(1, 2) == 1 + 2);

    BOOST_HANA_CONSTEXPR_LAMBDA auto increment = _ + 1;
    BOOST_HANA_CONSTEXPR_CHECK(increment(1) == 2);

    BOOST_HANA_CONSTEXPR_LAMBDA auto double_ = 2 * _;
    BOOST_HANA_CONSTEXPR_CHECK(double_(1) == 2);

    // Extra arguments are ignored.
    BOOST_HANA_CONSTEXPR_CHECK(double_(1, "ignored") == 2);
    //! [main]
}