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-//
-// tick_count_timer.cpp
-// ~~~~~~~~~~~~~~~~~~~~
-//
-// Copyright (c) 2003-2017 Christopher M. Kohlhoff (chris at kohlhoff dot com)
-//
-// Distributed under the Boost Software License, Version 1.0. (See accompanying
-// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
-//
-
-#include <boost/asio.hpp>
-#include <ctime>
-#include <iostream>
-
-#if defined(WIN32)
-# include <windows.h>
-#else
-# error This example is for Windows only!
-#endif
-
-struct tick_count_traits
-{
- // The time type. This type has no constructor that takes a DWORD to ensure
- // that the timer can only be used with relative times.
- class time_type
- {
- public:
- time_type() : ticks_(0) {}
- private:
- friend struct tick_count_traits;
- DWORD ticks_;
- };
-
- // The duration type. According to the TimeTraits requirements, the duration
- // must be a signed type. This means we can't handle durations larger than
- // 2^31.
- class duration_type
- {
- public:
- duration_type() : ticks_(0) {}
- duration_type(LONG ticks) : ticks_(ticks) {}
- private:
- friend struct tick_count_traits;
- LONG ticks_;
- };
-
- // Get the current time.
- static time_type now()
- {
- time_type result;
- result.ticks_ = ::GetTickCount();
- return result;
- }
-
- // Add a duration to a time.
- static time_type add(const time_type& t, const duration_type& d)
- {
- time_type result;
- result.ticks_ = t.ticks_ + d.ticks_;
- return result;
- }
-
- // Subtract one time from another.
- static duration_type subtract(const time_type& t1, const time_type& t2)
- {
- // DWORD tick count values can wrap (see less_than() below). We'll convert
- // to a duration by taking the absolute difference and adding the sign
- // based on which is the "lesser" absolute time.
- return duration_type(less_than(t1, t2)
- ? -static_cast<LONG>(t2.ticks_ - t1.ticks_)
- : static_cast<LONG>(t1.ticks_ - t2.ticks_));
- }
-
- // Test whether one time is less than another.
- static bool less_than(const time_type& t1, const time_type& t2)
- {
- // DWORD tick count values wrap periodically, so we'll use a heuristic that
- // says that if subtracting t1 from t2 yields a value smaller than 2^31,
- // then t1 is probably less than t2. This means that we can't handle
- // durations larger than 2^31, which shouldn't be a problem in practice.
- return (t2.ticks_ - t1.ticks_) < static_cast<DWORD>(1 << 31);
- }
-
- // Convert to POSIX duration type.
- static boost::posix_time::time_duration to_posix_duration(
- const duration_type& d)
- {
- return boost::posix_time::milliseconds(d.ticks_);
- }
-};
-
-typedef boost::asio::basic_deadline_timer<
- DWORD, tick_count_traits> tick_count_timer;
-
-void handle_timeout(const boost::system::error_code&)
-{
- std::cout << "handle_timeout\n";
-}
-
-int main()
-{
- try
- {
- boost::asio::io_context io_context;
-
- tick_count_timer timer(io_context, 5000);
- std::cout << "Starting synchronous wait\n";
- timer.wait();
- std::cout << "Finished synchronous wait\n";
-
- timer.expires_from_now(5000);
- std::cout << "Starting asynchronous wait\n";
- timer.async_wait(&handle_timeout);
- io_context.run();
- std::cout << "Finished asynchronous wait\n";
- }
- catch (std::exception& e)
- {
- std::cout << "Exception: " << e.what() << "\n";
- }
-
- return 0;
-}