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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/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);
- }
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