C++11 中，可在想要 “禁止使用” 的特殊成员函数声明后加 “= delete”（当然也可以声明为私有函数或者保护函数），而需要保留的加 "= default" 或者不采取操作
class LeafOfTree{
public:
LeafOfTree() = default;
~LeafOfTree() = default;
LeafOfTree(const LeafOfTree&) = delete; // mark copy ctor or copy assignment operator as deleted functions
LeafOfTree & operator=(const LeafOfTree&) = delete;
};
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