C++ 编写一个不可复制的类

C++ 编写一个不可复制的类

flyfish

Effective C++:条款06

若不想使用编译器自动生成的函数，就该明确拒绝 .

老式C++的写法

class noncopyable
{
protected:
	noncopyable() {}
	~noncopyable() {}
private:
	noncopyable( const noncopyable& );
	noncopyable& operator=( const noncopyable& );
};

C++11的写法

class noncopyable
{
protected:
	constexpr noncopyable() = default;
	~noncopyable() = default;
	noncopyable( const noncopyable& ) = delete;
	noncopyable& operator=( const noncopyable& ) = delete;
};

Boost的实现

Boost不将两种方法结合，还防止无意识的ADL(protection from unintended ADL)

ADL(Argument Dependent Lookup)

	namespace boost {
		namespace noncopyable_
		{
			class noncopyable
			{

			};
		}
		typedef noncopyable_::noncopyable noncopyable;

}