摘要： 今天才发现，C++中结构体不仅能够定义方法，还能有继承关系。如下面代码所示： namespace std{ struct output_iterator_tag{}; struct input_iterator_tag{}; struct forward_iterator_tag :public input_iterator_tag{ }; struct bidirectional_iterator_tag :public forward_iterator_tag{ }; struct random_access_iterator_tag :public bidirectional_itera 阅读全文