int &c = 1; //Error

const int& d = 1; //OK

int&& e = 1; // double & can be bound to unnamed guy
const int &&e = 1;

int&& gg = e; // Error
int& lala = e // Ok

int& hoho = e = 1; // Ok

		name	unname
int&	l value reference	yes	no
const int&	const l value reference	yes	yes
int&&	R value reference	no	yes

R value reference is from C++11

R value reference is for reference of temp objects

Place of temp objects

const int& a = 1;

const reference initialization

void print_word Word x){ x.print (); }

printWord("Titanic");

argument passing

int func(int x){return x;}

function return value

int x = a + b + c;

evaluation of expressions

temp objects are stored in stack, FILO

Screenshot 2024-05-12 at 22.21.09.png

difference between const & and &&

Move

A
{
	private:
	int* p;

A(A&& a)
{
	p = a.p;
	a.p = nullptr;
}
};

A func(int a)
{
	A obj(a);
	// return a; //this will use a move constructor(by compiler opt)
	return move(obj); // This is the move function in CPP11
}