Multiple inheritance constructor execution order in C + +

Code Listing 1:

1#include <cstdio>2#include <iostream>3 4 using namespacestd;5 6 classa{7      Public:8 A () {9cout<<"A"<<Endl;Ten         } One }; A classb{ -      Public: - B () { thecout<<"B"<<Endl; -         } - }; - classC: PublicB Publica{ + //class C:public A,public b{ -      Public: + C () { Acout<<"C"<<Endl; at         } - }; - intMain () { -  - c C; -     return 0; in}

Output:

Bac

Analysis:

Multiple inheritance is similar to single inheritance, and it is the base class constructor that executes first. Between multiple base classes, it executes from left to right when declared by a derived class.

Code Listing 2:

1#include <cstdio>2#include <iostream>3 4 using namespacestd;5 6 classa{7      Public:8 A () {9cout<<"A"<<Endl;Ten         } One }; A classb{ -      Public: - B () { thecout<<"B"<<Endl; -         } - }; - classC: PublicB Publica{ + //class C:public A,public b{ -      Public: + A; A C () { atcout<<"C"<<Endl; -         } - }; - intMain () { -  - c C; in     return 0; -}

Output:

BAAC

Analysis:

Execution order: base class constructor, initialize member variable, derived class constructor

Multiple inheritance constructor execution order in C + +