最近遇到一个问题:在运行到用erase删除map容器元素时程序总是挂断,出现A/libc: Fatal signal 11 (SIGSEGV), code 1, fault addr 0x1 in tid 10671 (Thread-2225)错误,在m_disappeared.erase(objectID)处,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 类型数据,之后这条记录就删除了,调试发现是删除元素之后it 迭代器错误,换成如下代码就好了,应该是说在用了迭代器遍历map时要删除其中某个元素,只能是用iterator erase( iterator pos ),而不能用size_type erase( const key_type& key )删除。
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;
}
}