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1 | // Copyright Louis Dionne 2013-2016 |
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 | ||
11 | BOOST_HANA_CONSTEXPR_LAMBDA auto factorial = hana::fix([](auto fact, auto n) -> int { | |
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 | } |