Initialization

initialization1.cpp

#include <iostream>

class B{
    public:
    int a;
    B():a(1){}
};

class A{
    public:
    B b;
    A(B b):b(b){}
};

int main(){
    A obj1(B());  
    std::cout<< obj1.b.a;
    // This might be a compiler error because obj1 gets
    // interpreted as a declaration of a method.

   A obj2( (B()) );
   std::cout<< obj2.b.a; 
    // With the extra set of parenthesis, this is correctly
    // interpreted as the creation of an object of class A;
   
}