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()11int 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