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

   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/functional/lockstep.hpp>
   6 #include <boost/hana/plus.hpp>
   7 namespace hana = boost::hana;
   8
   9
  10 constexpr int to_int(char c) {
  11     return static_cast<int>(c) - 48;
  12 }
  13
  14 constexpr int increment(int i) {
  15     return i + 1;
  16 }
  17
  18 static_assert(hana::lockstep(hana::plus)(to_int, increment)('3', 4) == 3 + 5, "");
  19
  20 int main() { }