多叉树实现，抽象树节点内容，用回调函数实现内容创建 比较 销毁 -Multi-tree realization of the abstract tree node content, using a callback function to achieve content creation compared the destruction of

通用的平衡二叉树算法C++源代码，通过通用的回调函数保证通用性，性能良好-Balanced binary tree algorithm for general-purpose C++ source code, to ensure that the callback function through the general versatility and good performance