一个类似于c++ stl中的auto_ptr，但是功能更加的强大。支持复制构造，并且新构造出来的实例和被复制的实例都拥有资源的操作权力，而且在最后一个拥有资源的实例被析构的时候资源才会被自动的释放-A similar c++ Stl of auto_ptr, but more powerful features. Support copy constructor, and the new structure by copying examples and examples have the resources to operate the power, but also have the resources in the last example was a time when resources destructor will automatically release