c++ - Input values into custom class with "<<" -

i new c++, , trying figure out how following:

i have class holds qlist. trying populate qlist demonstrated below. wondering how achieve this? done in numberlist constructor? populate mylist using method takes list of objects, , extracts them fill qlist, not work example below.

numberlist mylist; mylist << 1 << 2 << 3; 

easy.

numberlist & operator<<(numberlist & lhs, number_t rhs) {     lhs.append(rhs);     return lhs; } 

or, member function, this:

numberlist & numberlist::operator<<(number_t rhs) {     append(rhs);     return *this; }