First to the segment of code:
1 class A{ 2 public: 3 int x=0; 4 A():x(1){cout<<"A(): x="<<x<<endl;} 5 A(int a):x(a){cout<<"A(int a): x="<<x<<endl;} 6 A(int a,int b):x(a){ 7 cout<<"A(int a,int b): x="<<x; 8 x=9; 9 cout<<" "<<"x="<<x<<endl; 10 } 11 }; 12 int main(){ 13 A x1; 14 A x2(3); 15 A x3(5,7); 16 getchar(); 17 }
Output:
>>> >>> initialization list constructor to initialize internal initialization sequence can be seen as a member variable declarations
Also, if there are multiple variables list initialization, the initialization sequence according to the first class declared in the order, rather than what you write A (): a (1), b (2), c (3) {} on will necessarily go to a >>> b >>> c initialized!