ceph/src/spawn/test/test_async_result.cc

   1 // Copyright (c) 2020 Casey Bodley (cbodley at redhat dot com)
   2 //
   3 // Distributed under the Boost Software License, Version 1.0. (See accompanying
   4 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   5 //
   6
   7 #include <spawn/spawn.hpp>
   8
   9 // make assertions about async_result::return_type with different signatures
  10 // this is a compilation test only
  11
  12 template <typename Sig>
  13 struct yield_result : boost::asio::async_result<spawn::yield_context, Sig> {};
  14
  15 template <typename T, typename Sig>
  16 struct yield_returns : std::is_same<T, typename yield_result<Sig>::return_type> {};
  17
  18 // no return value
  19 static_assert(yield_returns<void, void()>::value,
  20               "wrong return value for void()");
  21 static_assert(yield_returns<void, void(boost::system::error_code)>::value,
  22               "wrong return value for void(error_code)");
  23 // single-parameter return value
  24 static_assert(yield_returns<int, void(int)>::value,
  25               "wrong return value for void(int)");
  26 static_assert(yield_returns<int, void(boost::system::error_code, int)>::value,
  27               "wrong return value for void(error_code, int)");
  28 // multiple-parameter return value
  29 static_assert(yield_returns<std::tuple<int, std::string>,
  30                             void(int, std::string)>::value,
  31               "wrong return value for void(int, string)");
  32 static_assert(yield_returns<std::tuple<int, std::string>,
  33                             void(boost::system::error_code, int, std::string)>::value,
  34               "wrong return value for void(error_code, int, string)");
  35 // single-tuple-parameter return value
  36 static_assert(yield_returns<std::tuple<int, std::string>,
  37                             void(std::tuple<int, std::string>)>::value,
  38               "wrong return value for void(std::tuple<int>)");
  39 static_assert(yield_returns<std::tuple<int, std::string>,
  40                             void(boost::system::error_code, std::tuple<int, std::string>)>::value,
  41               "wrong return value for void(error_code, std::tuple<int>)");
  42 // single-pair-parameter return value
  43 static_assert(yield_returns<std::pair<int, std::string>,
  44                             void(std::pair<int, std::string>)>::value,
  45               "wrong return value for void(std::tuple<int>)");
  46 static_assert(yield_returns<std::pair<int, std::string>,
  47                             void(boost::system::error_code, std::pair<int, std::string>)>::value,
  48               "wrong return value for void(error_code, std::tuple<int>)");