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Diffstat (limited to 'doc/html/boost_asio/example/cpp03/timers/tick_count_timer.cpp')
-rw-r--r-- | doc/html/boost_asio/example/cpp03/timers/tick_count_timer.cpp | 123 |
1 files changed, 0 insertions, 123 deletions
diff --git a/doc/html/boost_asio/example/cpp03/timers/tick_count_timer.cpp b/doc/html/boost_asio/example/cpp03/timers/tick_count_timer.cpp deleted file mode 100644 index 8111a5cacd..0000000000 --- a/doc/html/boost_asio/example/cpp03/timers/tick_count_timer.cpp +++ /dev/null @@ -1,123 +0,0 @@ -// -// 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; -} |