timer.h

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/**********************************************************************
 * LeechCraft - modular cross-platform feature rich internet client.
 * Copyright (C) 2006-2014  Georg Rudoy
 *
 * Distributed under the Boost Software License, Version 1.0.
 * (See accompanying file LICENSE or copy at https://www.boost.org/LICENSE_1_0.txt)
 **********************************************************************/
 
#pragma once
 
#include <chrono>
#include <coroutine>
#include <QTimer>
#include "taskfwd.h"
#include "../threadsconfig.h"
 
namespace LC::Util
{
    namespace detail
    {
        struct UTIL_THREADS_API TimerAwaiter
        {
            QTimer Timer_;
 
            explicit TimerAwaiter (std::chrono::milliseconds duration, Qt::TimerType precision);
 
            bool await_ready () const noexcept;
            void await_suspend (std::coroutine_handle<> handle) noexcept;
            void await_resume () const noexcept;
        };
    }
 
    template<Qt::TimerType Precision>
    struct WithPrecision
    {
        std::chrono::milliseconds Duration_;
 
        auto operator co_await () const
        {
            return detail::TimerAwaiter { Duration_, Precision };
        }
    };
 
    using Precisely = WithPrecision<Qt::PreciseTimer>;
    using Coarsely = WithPrecision<Qt::CoarseTimer>;
    using VeryCoarsely = WithPrecision<Qt::VeryCoarseTimer>;
 
    inline detail::TimerAwaiter GetAwaiter (std::chrono::milliseconds duration, AwaiterCPO)
    {
        return detail::TimerAwaiter { duration, Qt::CoarseTimer };
    }
}
 
namespace LC
{
    inline auto operator co_await (std::chrono::milliseconds duration)
    {
        return Util::GetAwaiter (duration, {});
    }
}