ceph/src/boost/libs/hana/example/functional/compose.cpp

   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
  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 }