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Mastering Swift 3 - Linux

You're reading from   Mastering Swift 3 - Linux Learn to build fast and robust applications on the Linux platform with Swift

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Product type Paperback
Published in Jan 2017
Publisher Packt
ISBN-13 9781786461414
Length 380 pages
Edition 1st Edition
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Author (1):
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Jon Hoffman Jon Hoffman
Author Profile Icon Jon Hoffman
Jon Hoffman
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Table of Contents (24) Chapters Close

Mastering Swift 3 - Linux
Credits
About the Author
About the Reviewers
www.PacktPub.com
Preface
1. Taking the First Steps with Swift FREE CHAPTER 2. Learning About Variables, Constants, Strings, and Operators 3. Using Swift Collections and the Tuple Type 4. Control Flow and Functions 5. Classes and Structures 6. Using Protocols and Protocol Extensions 7. Protocol-Oriented Design 8. Writing Safer Code with Error Handling 9. Custom Subscripting 10. Using Optional Types 11. Working with Generics 12. Working with Closures 13. Using C Libraries with Swift 14. Concurrency and Parallelism in Swift 15. Swifts Core Libraries 16. Swift on Single Board Computers 17. Swift Formatting and Style Guide 18. Adopting Design Patterns in Swift

Memory management


As I mentioned at the start of this chapter, structures are value types and classes are reference types. What this means is that, when we pass an instance of a structure within our application, such as a parameter of a method, we create a new instance of the structure in the memory. This new instance of the structure is only valid while the application is in the scope where the structure was created. Once the structure goes out of scope, the new instance of the structure is destroyed and the memory is released. This makes memory management of structures pretty easy and somewhat painless.

Classes, on the other hand, are of the reference type. This means that we allocate the memory for the instance of the class only once when it is initially created. When we want to pass an instance of the class within our application, as either a function argument or by assigning it to a variable, we really pass a reference to where the instance is stored in the memory. Since the instance...

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