What does operator overloading mean in C++?

C++ operator overloading refers to changing the behavior of operators by defining and implementing functions. In C++, one can define operations for custom types by overloading operators, giving them similar behavior to built-in types. By overloading operators, custom type objects can be used for arithmetic, comparison, bitwise operations, and more.

The syntax for overloading operators is as follows:

返回类型 operator 运算符(参数列表)
{
    // 运算符的实现
}

The return type refers to the type of value that a operator returns, for example, the addition operator returns the sum of two values. Operators can have one or more parameters that are used to pass objects or values for the operator to work on.

By overloading operators, custom types of objects can perform operations such as addition, subtraction, multiplication, division, comparison, logical operations, etc., making the code cleaner and easier to read.