This is just a little snippet that is quite useful for reporting when your GUI thread (the main thread / actor) hangs for a significant amount of time. There are numerous heavier-weight tools for analysing this sort of thing, but I’ve found that this simple monitor does what I need most of the time. You… Read more
I’ve been exploring SwiftData lately, and I’ve been unpleasantly surprised by how many sharp edges it has. I’m going to try to describe some of them here, so that hopefully others can avoid them (or perhaps be dissuaded from using SwiftData to begin with). I’m using Xcode 15.0.1 (Swift 5.9) on macOS 14.1 (Sonoma). Background… Read more
Swift’s Collection and Sequence protocols provide two primary ways to enumerate (filter, map, reduce, etc): functional-style and imperatively. For example: Or: Nominally these are equivalent – they’ll produce the same results for all correctly-implemented Collections and Sequences. So in principle which you use is purely a matter of stylistic preference. But is it? Do they… Read more
Say you want to perform some operation after a delay, and/or at regular intervals, inside a Swift actor – maybe your actor represents a weather station and you want to periodically fetch the latest weather information, automatically. How do you do that? You could punt the problem to some other code, outside the actor –… Read more
After the horrible experience just acquiring, installing, & configuring a basic Raspberry Pi, I was anticipating much effort – likely ending in failure – to get Swift working. I was pleasantly surprised. There are multiple ways to do it, apparently. One would think that there’d be the correct & working packages already available through apt,… Read more
It’s been a while since I wrote any meaningful Swift. How I didn’t miss the Swift compiler’s bullshit error messages. That yields, on the popFirst() method: Cannot use mutating member on immutable value: ‘someArray’ is immutable. No it’s not. It’s simply not. For whatever reason, if you instead call popFirst() on ArraySlice – ostensibly indistinguishable from… Read more
swift/lib/Basic/LangOptions.cpp has most of the conditional compilation macros (called “Language Options” in the compiler internally). Notably the swift() version macro is absent, and doesn’t seem to be defined anywhere… At time of writing the two undocumented additions, to the os(), arch(), and swift() set, are _endian() and _runtime(). I have no idea if they’re useful… Read more