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//! Clear unregisters every previously registered callback, erasing every		//! Clear unregisters every previously registered callback, erasing every
//! map entry. After this call, the list may still contain callbacks that		//! map entry. After this call, the list may still contain callbacks that
//! are currently executing, but it will be cleared when they are done		//! are currently executing, but it will be cleared when they are done
//! executing.		//! executing.
void Clear() {		void Clear() {
LOCK(m_mutex);		LOCK(m_mutex);
for (const auto &entry : m_map) {		for (const auto &entry : m_map) {
if (!--entry.second->count) m_list.erase(entry.second);		if (!--entry.second->count) {
		m_list.erase(entry.second);
		}
}		}
m_map.clear();		m_map.clear();
}		}

template <typename F> void Iterate(F &&f) {		template <typename F> void Iterate(F &&f) {
WAIT_LOCK(m_mutex, lock);		WAIT_LOCK(m_mutex, lock);
for (auto it = m_list.begin(); it != m_list.end();) {		for (auto it = m_list.begin(); it != m_list.end();) {
++it->count;		++it->count;
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