February 2017
Intermediate to advanced
402 pages
8h 7m
English
Content preview from Go Design PatternsBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Memento design pattern
Let's now look at a pattern with a fancy name. If we check a dictionary to see the meaning of memento, we will find the following description:
"An object kept as a reminder of a person or event."
Here, the key word is reminder as we will remember actions with this design pattern.
Description
The meaning of memento is very similar to the functionality it provides in design patterns. Basically, we'll have a type with some state and we want to be able to save milestones of its state. Having a finite amount of states saved, we can recover them if necessary for a variety of tasks-undo operations, historic, and so on.
The Memento design pattern usually has three players (usually called actors):
- Memento: A type that stores the type ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.