What are lvalue references in C++?

What are lvalue references in C++?

Lvalue references are references that can bind to lvalues, allowing you to modify the original variable.

Can you give me an example of how to use lvalue references?

Sure! Here's a simple example:

int x = 10;
int &ref = x; // ref is an lvalue reference to x
ref = 20; // x is now 20

In this case, ref refers to x, and modifying ref changes x.

What is the difference between lvalue and rvalue references?

Lvalue references can bind to lvalues, while rvalue references can bind to temporary objects (rvalues). Rvalue references are declared using &&.

When should I use lvalue references?

Use lvalue references when you want to modify an existing variable or pass it to a function without copying.