ceph/src/boost/libs/callable_traits/example/void.cpp

   1 /*
   2
   3 Copyright Barrett Adair 2016-2017
   4 Distributed under the Boost Software License, Version 1.0.
   5 (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
   6
   7 */
   8
   9 #include <type_traits>
  10 #include <functional>
  11 #include <tuple>
  12 #include <boost/callable_traits.hpp>
  13
  14 struct foo {
  15     void operator()() const {}
  16 };
  17
  18 namespace ct = boost::callable_traits;
  19
  20 int main() {
  21
  22     using args = ct::args_t<foo>;
  23     using expected_args = std::tuple<>;
  24     static_assert(std::is_same<args, expected_args>{}, "");
  25
  26     using signature = ct::function_type_t<foo>;
  27     using expected_signature = void();
  28     static_assert(std::is_same<signature, expected_signature>{}, "");
  29
  30     return 0;
  31 }