[ceph.git] / ceph / src / boost / libs / hana / example / optional / make.cpp

// 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/core/make.hpp>
#include <boost/hana/equal.hpp>
#include <boost/hana/optional.hpp>
namespace hana = boost::hana;


int main() {
    constexpr auto x = hana::make<hana::optional_tag>();
    BOOST_HANA_CONSTANT_CHECK(x == hana::make_optional());
    BOOST_HANA_CONSTANT_CHECK(hana::is_nothing(x));

    constexpr auto just_x = hana::make<hana::optional_tag>('x');
    static_assert(just_x == hana::make_optional('x'), "");
    BOOST_HANA_CONSTANT_CHECK(hana::is_just(just_x));
}
Commit	Line	Data
b32b8144	1	// Copyright Louis Dionne 2013-2017
7c673cae FG	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/core/make.hpp>
	7	#include <boost/hana/equal.hpp>
	8	#include <boost/hana/optional.hpp>
	9	namespace hana = boost::hana;
	10
	11
	12	int main() {
	13	constexpr auto x = hana::make<hana::optional_tag>();
	14	BOOST_HANA_CONSTANT_CHECK(x == hana::make_optional());
	15	BOOST_HANA_CONSTANT_CHECK(hana::is_nothing(x));
	16
	17	constexpr auto just_x = hana::make<hana::optional_tag>('x');
	18	static_assert(just_x == hana::make_optional('x'), "");
	19	BOOST_HANA_CONSTANT_CHECK(hana::is_just(just_x));
	20	}