People
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Whether you're trying to give back to the open source community or collaborating on your own projects, knowing how to properly fork and generate pull requests is essential. Unfortunately, it's quite easy to make mistakes or not know what you should do when you're initially learning the process. I know that I certainly had considerable initial trouble with it, and I found a lot of the information on GitHub and around the internet to be rather piecemeal and incomplete - part of the process described here, another there, common hangups in a different place, and so on.
In an attempt to coallate this information for myself and others, this short tutorial is what I've found to be fairly standard procedure for creating a fork, doing your work, issuing a pull request, and merging that pull request back into the original project.
Just head over to the GitHub page and click the "Fork" button. It's just that simple. Once you've done that, you can use your favorite git client to clone your repo or j
| // Playground - noun: a place where people can play | |
| import Cocoa | |
| var str = "Hello, playground" | |
| // Here's take 1. First, I defined the algebra like I would in | |
| // Scala, as separate protocols: | |
| protocol Semigroup { | |
| typealias T |
#Every Single Option Under The Sun
Author: Chris Lattner
| // https://stackoverflow.com/a/45777692/5536516 | |
| import Foundation | |
| struct MemoryAddress<T>: CustomStringConvertible { | |
| let intValue: Int | |
| var description: String { | |
| let length = 2 + 2 * MemoryLayout<UnsafeRawPointer>.size |
The libdispatch is one of the most misused API due to the way it was presented to us when it was introduced and for many years after that, and due to the confusing documentation and API. This page is a compilation of important things to know if you're going to use this library. Many references are available at the end of this document pointing to comments from Apple's very own libdispatch maintainer (Pierre Habouzit).
My take-aways are:
You should create very few, long-lived, well-defined queues. These queues should be seen as execution contexts in your program (gui, background work, ...) that benefit from executing in parallel. An important thing to note is that if these queues are all active at once, you will get as many threads running. In most apps, you probably do not need to create more than 3 or 4 queues.
Go serial first, and as you find performance bottle necks, measure why, and if concurrency helps, apply with care, always validating under system pressure. Reuse
