What is operator overloading in C++?

What is operator overloading in C++?

Operator overloading allows you to redefine the way operators work for user-defined types in C++. For example, you can define how the '+' operator behaves for a class.

Can you give me a basic example of operator overloading?

Sure! Here's a simple example:

class Box {
public:
    int length;
    Box(int l) : length(l) {}
    Box operator+(const Box& b) {
        return Box(this->length + b.length);
    }
};

In this example, the '+' operator is overloaded to add the lengths of two Box objects.

What happens if I try to add two different types?

If you try to add two different types without an overloaded operator, you'll get a compilation error. You need to define how the operation should work for those types.

Are there any operators that cannot be overloaded?

Yes, some operators like ::, .*, and . cannot be overloaded in C++. These operators have fixed meanings in the language.