This tool is very useful, but quite dangerous as well. An operator is a special symbol or phrase that you use to check, change, or combine values. If that doesn’t convince you, just change the operator to +=: func +=(left: inout CGFloat, right: Float) { left += CGFloat(right) } If that doesn't convince you, just change the operator to +=: func +=(left: inout CGFloat, right: Float) { left += CGFloat(right) } Only the compound assignment operators can be overloaded. It can make your code a lot more concise, making even a function call seem like a 3-hour long lecture. Please leave me comment and share your thought. Let's suppose a condition. It is not possible to overload the default assignment operator (=). Similarly, the ternary conditional operator (a ? Example 2 : Overloading ++ operator and overloading postincrement operator Basic Operators¶. When two are more functions have same name but different arguments then they are known as overloaded functions and this process in known as function overloading. Operator overloading, used with caution, can be extremely powerful – I hope you find a way to use it in your own projects. For reference, you can download the Playground file on GitHub. Operator overloading is the practice of adding new operators and modifying existing ones to do different things. Similarly, the ternary conditional operator (a ? The “With great power comes great responsibility,” quote is very appropriate for operator overloading. In the code below, the four binary operators +, -, *, / are overloaded where the left side is a Double and the right side is an Int Need of Function Overloading. This operators operate on a single operand. b : c) cannot be overloaded. The next operator you’ll want to overload is the negation sign, which will change the sign of each component of the Vector . In the program, void operator ++ operator function is defined (inside overload class). So today, we are going to talk about Operator overloading in Swift. Swift Function Overloading . There is a lot of information on the net; always check which version of Swift it applies to. In Swift, user defined ternary operators are not supported and there is only one built-in ternary operator which you can read about in Apple’s documentation. Operators are those little symbols like +, *, and /, and Swift uses them in a variety of ways depending on context – a string plus another string equals a combined string, for example, whereas an integer plus another integer equals a summed integer. You can categorize operators broadly in two basic categories based on the: Number of of operands; Operation of an operator; According to the number of operands an operator operates on, operators can be categorized as: 1. b : c) cannot be overloaded. Be mindful of ambiguities when overloading or customising operators and document your code to avoid this. What do you think about this tutorial and operator overloading? In order to avoid the compiler from complaining and requesting data type conversion, when doing addition a Double number plus an Int number the operator + needs to be overloaded. I have tested the code on Xcode 7.3 and Swift 2.2. Types of operators. Only the compound assignment operators can be overloaded. It is not possible to overload the default assignment operator (=). Swift is a highly customisable language and with a bit of care, you can greatly improve the readability of your code. This function increments the value of count by 1 for i object. Unary operator. This function is called when ++ operator operates on the object of overload class (object i in this case). Operator overloading is also used in many other languages including C++, Python, Swift, and PHP. 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