Disassembly Quest C + + inheritance

#include <iostream>classtabletennisplayer{Private:    intID; Public: Tabletennisplayer (intID); voidsayhi ();}; Tabletennisplayer::tabletennisplayer (intN) {ID=N;}voidTabletennisplayer::sayhi () {std::cout<<"hi,i am Player"<< ID <<Std::endl;}classMasterplayer: Publictabletennisplayer{Private:    intID; Public: Masterplayer (intID); voidfuck ();}; Masterplayer::masterplayer (intN): Tabletennisplayer (n) {ID=N;}voidMasterplayer::fuck () {std::cout<<"Fuck"<<Std::endl;}intMainvoid){    usingstd::cout; usingstd::cin; Tabletennisplayer player (1); Masterplayer Master (2);    Player.sayhi ();    Master.sayhi ();    Master.fuck (); cout<<sizeof(player) <<Std::endl; cout<<sizeof(master) <<Std::endl; Cin.Get();}

The parent class member variable ID is initialized in the constructor.

Subclasses also have member variable IDs, which are initialized in the subclass constructor.

The disassembly code sees that the subclass constructor initializes the subclass when the parent class constructor is called first to initialize the parent class--specifically to initialize the parent class member variable.

So:

This is the parent class in memory storage 00 00 00 01 of 4 bytes

This is the storage of the subclass in the parent class:

00 00 00 02 00 00 00 02 is 8 bytes, the first four bytes are the parent class member variable, and the last four bytes is the subclass member variable

As a result, subclasses are inclusive relationships to the parent class. This refers to the inclusion of a parent class member variable. In addition, the constructor is nothing special. is actually the function that is called automatically when the class is established. To initialize a class member, that is, to request memory for a member variable. Subclass initialization, first calling the parent class constructor method, initializes the parent class member variable. Then call your own, initialize your own member variable.

Disassembly Quest C + + inheritance