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Mastering Delphi Programming: A Complete Reference Guide

You're reading from   Mastering Delphi Programming: A Complete Reference Guide Learn all about building fast, scalable, and high performing applications with Delphi

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Product type Course
Published in Nov 2019
Publisher Packt
ISBN-13 9781838989118
Length 674 pages
Edition 1st Edition
Languages
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Author (1):
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Primož Gabrijelčič Primož Gabrijelčič
Author Profile Icon Primož Gabrijelčič
Primož Gabrijelčič
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Toc

Table of Contents (19) Chapters Close

Preface 1. About Performance 2. Fixing the Algorithm FREE CHAPTER 3. Fine-Tuning the Code 4. Memory Management 5. Getting Started with the Parallel World 6. Working with Parallel Tools 7. Exploring Parallel Practices 8. Using External Libraries 9. Introduction to Patterns 10. Singleton, Dependency Injection, Lazy Initialization, and Object Pool 11. Factory Method, Abstract Factory, Prototype, and Builder 12. Composite, Flyweight, Marker Interface, and Bridge 13. Adapter, Proxy, Decorator, and Facade 14. Nullable Value, Template Method, Command, and State 15. Iterator, Visitor, Observer, and Memento 16. Locking Patterns 17. Thread pool, Messaging, Future and Pipeline 18. Other Books You May Enjoy

Variable capturing

Before I start writing parallel code, I have to cover something completely different. As you'll see in this chapter, the big part of the incredible usefulness of tasks and patterns is the ability to use them in combination with anonymous methods and variable capturing. As powerful as that combination is, however, it also brings in some problems.

The code in this chapter will frequently run into the problem of capturing a loop variable. Instead of trying to explain this problem at the same time as dealing with the already hard concepts of parallel code, I decided to write a simple program that demonstrates the problem and does nothing more.

The code in the AnonMethod project tries to write out the numbers from 1 to 20 in a convoluted way. For each value of i, the code calls TThread.ForceQueue and passes in an anonymous method that calls Log(i) to write...

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