map erase

 最近遇到一個問題：在運行到用erase刪除map容器元素時程序總是掛斷，出現A/libc: Fatal signal 11 (SIGSEGV), code 1, fault addr 0x1 in tid 10671 (Thread-2225）錯誤，在m_disappeared.erase(objectID)處，如下；

for (auto it= m_disappeared.begin(); it != m_disappeared.end(); it++){
	int objectID = it->first;
	m_disappeared[objectID] = m_disappeared[objectID] + 1;
	if (m_disappeared[objectID] > m_maxDisappeared){
		m_disappeared.erase(objectID);
	}
}

 m_disappeared.erase(objectID)返回的是size_type 類型數據，之後這條記錄就刪除了，調試發現是刪除元素之後it 迭代器錯誤，換成如下代碼就好了，應該是說在用了迭代器遍歷map時要刪除其中某個元素，只能是用iterator erase( iterator pos )，而不能用size_type erase( const key_type& key )刪除。

for (auto it = m_disappeared.begin(); it != m_disappeared.end();){
	objectID = it->first;
	disappeare = it->second;
	m_disappeared[objectID] = disappeare + 1;
	if (m_disappeared[objectID] > m_maxDisappeared){
		it = m_disappeared.erase(it);
	}
	else{
		++it;
	}
}