学习笔记：default, delete关键字

struct NoNewable

{

  void *operator new(std::size_t) = delete; //禁止通过new操作符创建对象

};

struct NonCopyable

{

  NonCopyable & operator=(const NonCopyable&) = delete; //禁止赋值

  NonCopyable(const NonCopyable&) = delete;  //禁止拷贝构造

  NonCopyable() = default;

};

struct NonStack

{

private:

    NonStack() = default; //禁止在栈上创建对象

public:

    static NonStack* Create(){

        return new NonStack;

    }

};

struct OnlyInt
{
  void f(int i);
  template<class T> void f(T) = delete; //禁止用非int类型参数调用f
};