C++禁止使用拷貝構造函數和賦值運算符方法

1.將拷貝構造函數和賦值運算符聲明為私有，並不予實現

class Uncopyable  
{  
private:  
    Uncopyable(const Uncopyable &); // 阻止copying  
    Uncopyable &operator=(const Uncopyable &);  
};  

2.使用delete

class Uncopyable  
{  

    Uncopyable(const Uncopyable &) =delete; // 阻止copying  
    Uncopyable &operator=(const Uncopyable &)=delete;  
};