: m_event(::CreateEventW(NULL, FALSE, initiallySet ? TRUE : FALSE, NULL))

{

if (m_event.handle() == NULL)

{

DWORD errorCode = ::GetLastError();

throw std::system_error

{

static_cast<int>(errorCode),

std::system_category(),

"auto_reset_event: CreateEvent failed"

};

}

{

BOOL ok =::SetEvent(m_event.handle());

if (!ok)

{

DWORD errorCode = ::GetLastError();

throw std::system_error

{

static_cast<int>(errorCode),

std::system_category(),

"auto_reset_event: SetEvent failed"

};

}

{

DWORD result = ::WaitForSingleObjectEx(m_event.handle(), INFINITE, FALSE);

if (result != WAIT_OBJECT_0)

{

DWORD errorCode = ::GetLastError();

throw std::system_error

{

static_cast<int>(errorCode),

std::system_category(),

"auto_reset_event: WaitForSingleObjectEx failed"

};

}

{

std::unique_lock lock{ m_mutex };

if (!m_isSet)

{

m_isSet = true;

m_cv.notify_one();

}

{

std::unique_lock lock{ m_mutex };

while (!m_isSet)

{

m_cv.wait(lock);

}

m_isSet = false;