Question 1

How to use the Observer pattern in Delphi with DelphiPatterns?

Accepted Answer

Download the project, navigate to the Behavioral.Observer directory, and examine the .pattern.pas file for the implementation and .example.pas for a usage demo. You can copy and adapt these files into your own Delphi projects to implement the pattern.

Question 2

Is DelphiPatterns compatible with the latest Delphi versions?

Accepted Answer

It's likely compatible with older Delphi versions, but since it's from an archived project, it may not use features from recent releases like generics or anonymous methods. Check the code for any deprecated syntax or libraries before use.

Question 3

Can I contribute missing patterns to DelphiPatterns?

Accepted Answer

Yes, the repository is on GitHub, so you can fork it and submit pull requests to add implementations for missing patterns like Prototype or Flyweight, as noted in the 'ToDo' section of the README.

Question 4

DelphiPatterns vs other design pattern resources for Delphi?

Accepted Answer

DelphiPatterns is unique in providing a complete set of GoF patterns with separate example files, while other resources might be scattered or less comprehensive. However, it may lack modern patterns or updated examples compared to newer tutorials or libraries.

Question 5

What license does DelphiPatterns use and can I use it commercially?

Accepted Answer

It uses the CDDL license, similar to MPL or EPL. You can use it commercially, but you must comply with license terms, such as disclosing source modifications if you distribute the code, which might add overhead for some projects.

Question 6

How to learn design patterns effectively with DelphiPatterns?

Accepted Answer

Start by reading the pattern descriptions and Wikipedia links in the README, then study the .pattern.pas files to understand the structure, and run the .example.pas projects to see them in action. Practice by implementing similar patterns in your own code to reinforce learning.

DelphiPatterns

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