October 2004
Intermediate to advanced
240 pages
6h 22m
English
book
C++ Coding Standards: 101 Rules, Guidelines, and Best Practices
by Herb Sutter, Andrei Alexandrescu
Content preview from C++ Coding Standards: 101 Rules, Guidelines, and Best Practices
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18. Declare variables as locally as possible
Summary
Avoid scope bloat, as with requirements so too with variables: Variables introduce state, and you should have to deal with as little state as possible, with lifetimes as short as possible. This is a specific case of Item 10 that deserves its own treatment.
Discussion
Variables whose lifetimes are longer than necessary have several drawbacks:
• They make the program harder to understand and maintain: For example, should code update the module-wide path string if it only changes the current drive?
• They pollute their context with their name: As a direct consequence of this, namespace-level variables, which are the most visible of all, are also the worst (see Item 10).
• They can’t always ...
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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.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
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.