Swift 2.0 Learning Notes (Day 20)--passing references to parameters in functions

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Passing references to parameters

A class is a reference type, and other data types such as Integer, float, Boolean, character, string, tuple, collection, enumeration, and struct are all value types.

Sometimes it is possible to pass a value type parameter as a reference, which is also achievable, andSwift provides ainoutkeyword can be implemented. Look at one of the following examples:

Func Increment (inout value:double, amount:double = 1.0) {    value + = amount} var value:double = 10.0 Increment (&v alue) print (value) increment (&value, amount:100.0) print (value)

CodeIncrement (&value)is the calling functionIncrement, the increment is the default value, where&value(in front of the variable, add&symbols, removingvalueaddress) is a method of passing a reference, which, when defining a function, identifies the parameter with theinoutcorrespond to one another.

CodeIncrement (&value,amount:100.0)also called functionsIncrement, the amount of growth is100.0.

The above code output results are as follows:

11.0

111.0

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Swift 2.0 Learning Notes (Day 20)--passing references to parameters in functions