What are the differences between double-dot ".." and triple-dot "..." in Git diff commit ranges?
Since I'd already created these images, I thought it might be worth using them in another answer, although the description of the difference between .. (dot-dot) and ... (dot-dot-dot) is essentially the same as in manojlds's answer. The command git diff typically¹ only shows you the difference between the states of the tree between exactly two points in the commit graph. The .. and ... notations i
Swift: How to use sizeof?
Updated for Swift 3 Be careful that MemoryLayout<T>.size means something different than sizeof in C/Obj-C. You can read this old thread https://devforums.apple.com/message/1086617#1086617 Swift uses an generic type to make it explicit that the number is known at compile time. To summarize, MemoryLayout<Type>.size is the space required for a single instance while MemoryLayout<Type>.stride is the di
ActiveRecord OR query Hash notation
I know there are 3 main notations for supplying arguments to the where ActiveRecord method: Pure String Array Hash Specifying and for the where method is straight forward: # Pure String notation Person.where("name = 'Neil' AND age = 27") # Array notation Person.where(["name = ? AND age = ?", 'Neil', 27]) # Hash notation Person.where({name: "Neil", age: 27}) Specifying or for this same where method
Multiple Set-cookie headers in HTTP
I'm writing a small class that acts as a very basic HTTP client. As part of a project I'm working on, I'm making it cookie aware. However, it's unclear to me what happens when my client receives multiple "Set-Cookie" headers with the same key but different values are set. For example, Set-Cookie: PHPSESSID=abc; path=/ Set-Cookie: PHPSESSID=def; path=/ Set-Cookie: PHPSESSID=ghi; path=/ Which one of
Mac OS X virtual audio driver
Take a look at the open-source WavTap, which is a simplified fork of the open-source SoundFlower virtual sound card driver. It is a .kext that I believe does substantially what you want. For reference, here is how some popular commercial closed-source options work: Rogue Amoeba's Audio Hijack Pro -Captures system audio via code based off of the open-source SoundFlower .kext -Captures an applicatio
Xcode 6 Bug: Unknown class in Interface Builder file
I upgraded to Xcode 6 beta 4 and now my App continuously crashes with the message Unknown class X in Interface Builder file. It crashes because supposedly Xcode can't find my custom classes that I have linked in my Storyboard but it shows that they are linked correctly in the Xcode interface. I'm positive everything is linked correctly. My only other option may be to delete the entire storyboard f
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