Why must the formal parameters of the copy constructor be set to a reference type?

lfq372

Why must the formal parameters of the copy constructor be set to a reference type?
Such as:
demo :: demo (const demo&object)
{
}
and
demo :: demo (const demo object)
{
}
Can't it work?

diamond52

Will lead to infinite recursion

diamond52

Because when the parameters are passed
If you adapt to passing objects instead of references, the combination of formal and actual parameters will use the copy constructor
Cause infinite recursion

diamond52

Personal opinions, experts advise

lfq372

I still do n’t understand what you said

julines

Infinite recursion

zhilong821

References guarantee that you pass in an object

julines

Because a copy constructor is called when taking an object as a parameter, if the copy constructor takes an object as a parameter, it will call itself.

KTPOPO

Because often cited does not produce side effects. It seems straightforward

orangedj

Because parameters are passed by value