以下代码段是什么意思

Question

I have a class named BridgeChannel. It has some things under the private sections. I don't know what they do.

private:

  BridgeChannel (const BridgeChannel &);
  BridgeChannel &operator = (const BridgeChannel &);

Your ideas and knowledge is greatly apprecitated.

Answer 1

It means that the copy constructor and copy assignment operator are private . This way objects of type BridgeChannel cannot be copied or assigned outside of BridgeChannel .

This is useful if your class contains some resource which is impossible, too costly, or nonsensical to copy.

In C++11 this idiom has been replaced by marking those functions as = delete , which serves the same purpose but provides clearer error messages.

An old helper to simplify this idiom is to inherit from boost::noncopyable .