error C2440

Posted 2020-08-24 邓戈麟

 

error C2440: “初始化”: 无法从“std::_List_const_iterator<std::_List_val<std::_List_simple_types<Observer *>>>”转换为“std::_List_iterator<std::_List_val<std::_List_simple_types<Observer *>>>”

 

如果传递过来是一个const类型的容器，那么只能用const_iterator进行遍历

 

		for (std::list<Observer *>::const_iterator it = m_observers.begin(); it != m_observers.end(); ++it)
		{
			Observer *obj = *it;
			obj->update(m_temperature, m_humidity, m_pressure);
		}