[ceph.git] / ceph / src / boost / libs / hana / example / functional / fix.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/config.hpp>
#include <boost/hana/functional/fix.hpp>
namespace hana = boost::hana;


BOOST_HANA_CONSTEXPR_STATELESS_LAMBDA auto factorial = hana::fix([](auto fact, auto n) -> int {
    if (n == 0) return 1;
    else        return n * fact(n - 1);
});

int main() {
    BOOST_HANA_CONSTEXPR_CHECK(factorial(5) == 120);
}
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/config.hpp>
	7	#include <boost/hana/functional/fix.hpp>
	8	namespace hana = boost::hana;
	9
	10
b32b8144	11	BOOST_HANA_CONSTEXPR_STATELESS_LAMBDA auto factorial = hana::fix([](auto fact, auto n) -> int {
7c673cae FG	12	if (n == 0) return 1;
	13	else return n * fact(n - 1);
	14	});
	15
	16	int main() {
	17	BOOST_HANA_CONSTEXPR_CHECK(factorial(5) == 120);
	18	}