Re: [swift-users] Why are Swift Loops slow?

> On 12 Oct 2016, at 23:05, Joe Groff via swift-users > wrote: > >> >> On Oct 12, 2016, at 2:25 AM, Gerriet M. Denkmann via swift-users >> wrote: >> >> uint64_t nbrBytes = 4e8; >> uint64_t count = 0; >> for( uint64_t byteIndex = 0; byteIndex <

Re: [swift-users] How to be DRY on ranges and closed ranges?

> On Oct 12, 2016, at 3:21 AM, Jean-Denis Muys via swift-users > wrote: > > > But this is not very DRY. > > What would be a more idiomatic way? > The more idiomatic way is to look at API design in a new way. Note these points: 1. `Countable` variant is preferred

[swift-users] Installation permissions issue with 3.0 release in Ubuntu 14.04?

Greetings, I'm not sure where to take this issue, so I'm starting here. It's an installation issue, not a language issue. Any tips on where to send this would be greatly appreciated! (And of course please let me know if it's a known issue.) I'm one of the brave that is installing Swift 3.0 on

Re: [swift-users] Counting in Threads

Not in this case, today: -- $ cat x.swift import Darwin.C public class AtomicInt32 { public fileprivate (set) var value : Int32 = 0 /// Create a new atomic integer with the specified initial value. public init(_ value: Int32 = 0) { self.value = value } /// Add one to the

Re: [swift-users] How to be DRY on ranges and closed ranges?

Yes, it is so inconvenient to use that CloseRange isn’t the special of Range. But according to your case, CountableRange can be used in the condition. And ClosedCountableRange and CountableRange is available to converting. Refer: https://oleb.net/blog/2016/09/swift-3-ranges/

Re: [swift-users] Counting in Threads

Or allocate a pointer for it. The other alternative would be NSLock but that might be swatting flies with sledgehammers. We had a similar issue implementing NSLock in swift-corelibs-foundation where taking the address of a pthread mutex corrupted the structure for when another thread would

Re: [swift-users] How to be DRY on ranges and closed ranges?

You could also create a “Range” protocol with “lowerBound” and “upperBound” properties. Conform all the range types to it, and make your function take generic over the protocol. Nevin On Wed, Oct 12, 2016 at 7:21 PM, Hooman Mehr via swift-users < swift-users@swift.org> wrote: > I recommend

Re: [swift-users] Counting in Threads

So we would have to drop down to C code, etc. to safely leverage OSAtomic? On Wed, Oct 12, 2016 at 8:32 AM Philippe Hausler via swift-users < swift-users@swift.org> wrote: > I was under the impression that taking the address was more than a single > load instruction and would emit a placeholder

Re: [swift-users] How to be DRY on ranges and closed ranges?

I recommend having explicit precondition and reducing repetition like this: import Foundation func random(from range: CountableRange) -> Int { precondition(range.count > 0, "The range can't be empty.") return random(from: CountableClosedRange(range)) } func

Re: [swift-users] Why are Swift Loops slow?

> On Oct 12, 2016, at 2:25 AM, Gerriet M. Denkmann via swift-users > wrote: > > uint64_t nbrBytes = 4e8; > uint64_t count = 0; > for( uint64_t byteIndex = 0; byteIndex < nbrBytes; byteIndex++ ) > { > count += byteIndex; > if ( ( byteIndex & 0x ) == 0

Re: [swift-users] find std lib doc

Dash + Alfred :) > On 12 Oct 2016, at 17:13, Lars-Jørgen Kristiansen via swift-users > wrote: > > I recommend Dash  > >> 12. okt. 2016 kl. 17.03 skrev Adrian Zubarev via swift-users >> >: >> >> You could also

Re: [swift-users] Counting in Threads

I suspect one of the actual compiler people might tell me I shouldn't trust this, but in practice it works: -- import Darwin.C public class AtomicInt32 { public fileprivate (set) var value : Int32 = 0 /// Create a new atomic integer with the specified initial value. public

Re: [swift-users] find std lib doc

You could also fallback to http://swiftdoc.org. ;) --  Adrian Zubarev Sent with Airmail Am 12. Oktober 2016 um 17:01:48, Jon Shier via swift-users (swift-users@swift.org) schrieb: I’m guessing you only came to Apple’s developer environment with Swift? (If not I apologize.) The searchability

Re: [swift-users] How to be DRY on ranges and closed ranges?

I’ve been bitten by that quite a few times. I’m not a fan of the new distinction between Range and ClosedRange. I understand the reasoning behind them, but the new model is creating more problems for me than the it solves. David. > On 12 Oct 2016, at 12:21, Jean-Denis Muys via swift-users >

[swift-users] How to be DRY on ranges and closed ranges?

Hi, I defined this: func random(from r: Range) -> Int { let from = r.lowerBound let to = r.upperBound let rnd = arc4random_uniform(UInt32(to-from)) return from + Int(rnd) } so that I can do: let testRandomValue = random(from: 4..<8) But this will not let me do: let

[swift-users] find std lib doc

Is it just me, or is the Standard library document not very discoverable? Try searching developer.apple.com for "(Swift) standard library". No hit! Can’t find it on swift.org either (which isn’t even searchable). In case anybody else needs it, Mateusz Malczak gave me the link:

[swift-users] Why are Swift Loops slow?

uint64_t nbrBytes = 4e8; uint64_t count = 0; for( uint64_t byteIndex = 0; byteIndex < nbrBytes; byteIndex++ ) { count += byteIndex; if ( ( byteIndex & 0x ) == 0 ) { count += 1.3; } (AAA) }; Takes 260 msec. Btw.: Without the (AAA) line the whole loop is done in 10 μsec.

[swift-users] Counting in Threads

How to translate this to Swift: __block atomic_uint_fast64_t counter = ATOMIC_VAR_INIT(0); dispatch_apply( nbrInterations, queue, ^void(size_t idx) { uint64_t tCount = 0; ... do some counting ... atomic_fetch_add_explicit( , tCount,

[swift-users] Looping with UInt64

With: let nbrBytes = 400_000_000 let localArray = UnsafeMutablePointer.allocate(capacity: nbrBytes) // touch every page before summing: for i in 0 ..< nbrBytes / 4096 { localArray[ 4096 * i ] = 1 } This rather innocent loop: var count: UInt64 = 0 for index in 0 ..< loopLimit { count +=