c++ - "&" meaning after variable type

Question

(This question already has answers here): question from:https://stackoverflow.com/questions/11604190/meaning-after-variable-type

Answer 1

It means you're passing the variable by reference.

In fact, in a declaration of a type, it means reference, just like:

int x = 42;
int& y = x;

declares a reference to x, called y.