May 2022
Intermediate to advanced
356 pages
6h 45m
English
Content preview from Crystal Programming
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Chapter 13: Advanced Macro Usages
In the last few chapters, we have looked at various metaprogramming concepts, such as macros, annotations, and how they can be used together to allow for introspecting types, methods, and instance variables at compile time. However, for the most part, we used them independently. These concepts can also be combined in order to allow for the creation of even more powerful patterns! In this chapter, we are going to explore a few of these, including:
- Using annotations to influence runtime logic
- Exposing annotation/type data at runtime
- Determining a constant's value at compile time
- Creating custom compile-time errors
By the end of this chapter, you should have a deeper understanding of metaprogramming in Crystal. ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
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.