{"id":6420,"date":"2022-08-08T20:17:45","date_gmt":"2022-08-08T20:17:45","guid":{"rendered":"https:\/\/www.modernescpp.com\/index.php\/classification-of-patterns-2\/"},"modified":"2022-08-08T20:17:45","modified_gmt":"2022-08-08T20:17:45","slug":"classification-of-patterns-2","status":"publish","type":"post","link":"https:\/\/www.modernescpp.com\/index.php\/classification-of-patterns-2\/","title":{"rendered":"Classification of Patterns"},"content":{"rendered":"

In my last post, I presented the classification of design patterns based on the seminal book “Design Patterns: Elements of Reusable Object-Oriented Software”<\/a>. Today, I present are more general classification of patterns based on the second seminal book “Pattern-Oriented Software Architecture, Volume 1<\/span><\/a>“.<\/p>\n

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 \"classification\"<\/p>\n

You may have already noticed it. The classification in my last post, “Classification of Design Patterns<\/a>” was about design patterns, but this post, “Classification of Patterns” is about patterns. This is intentional because the classification of “Pattern-Oriented Software Architecture, Volume 1<\/span><\/a>” (short POSA 1) is more general than the one of “Design Patterns: Elements of Reusable Object-Oriented Software”<\/a>. To make it short, today’s classification includes the last one.<\/p>\n

<\/span>Pattern-Oriented Software Architecture, Volume 1<\/span><\/h2>\n

Here is the big picture of the patterns presented in POSA 1.<\/p>\n

\"posa1\"<\/p>\n

POSA 1 uses two ways of classification. It classifies the patterns based on their structural category and their problem category. Before I dive into the two classifications, let me write a few words about the patterns in the table, written in bold letters.<\/p>\n

I will write about all patterns written in bold letters. The design patterns proxy, publish-subscriber, and counted pointer are particular. Proxy is already part of the book “Design Patterns: Elements of Reusable Object-Oriented Software”<\/a> and publish-subscriber is quite similar to the observer pattern that is also part of the already mentioned book. Additionally, you should already know and use the counter pointer idiom. In C++11, we call it std::shared_ptr<\/code><\/a>.<\/p>\n

<\/span>Structural Categories<\/span><\/h3>\n

Structural categorization is a categorization on their scale and abstraction:<\/p>\n