1 // Copyright Louis Dionne 2013-2017
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/compose.hpp>
8 namespace hana = boost::hana;
9 
10 
main()11 int main() {
12     BOOST_HANA_CONSTEXPR_LAMBDA auto to_char = [](int x) {
13         return static_cast<char>(x + 48);
14     };
15 
16     BOOST_HANA_CONSTEXPR_LAMBDA auto increment = [](auto x) {
17         return x + 1;
18     };
19 
20     BOOST_HANA_CONSTEXPR_CHECK(hana::compose(to_char, increment)(3) == '4');
21 }
22