Hi Isaac,
This is not about associated types. Rather, the issue is that a ‘Thing’ is a
‘Something’, but you are casting it to
‘Something’. The two types are not related; in general, if A
is a subtype of B, then G is not a subtype of G.
https://en.wikipedia.org/wiki/Covariance_and_contravarianc
I don't know if you are using an IDE, but in Xcode. I can just cmd+mouse
left click to see the code headers.
Zhaoxin
On Fri, Feb 17, 2017 at 2:22 AM, Jon Shier via swift-users <
swift-users@swift.org> wrote:
> I’ve had good luck with being able to click the candidates in
> cases like thi
I am a noob too and I got Swift to compile on Ubuntu 16.04 LTS using the
following command from the swift/utils directory:
./build-script --preset=buildbot_linux_1604 install_destdir=/tmp/install
installable_package=/tmp/swift.tar.gz
And then running swift with:
/tmp/install/bin/swift my_code.swi
Hi Francesco,
Which toolchain are you using? Is it the development or swift 3.1 snapshot and
which build did you download swift.org?
Thanks,
Mishal Shah
> On Feb 15, 2017, at 10:42 AM, Francesco via swift-users
> wrote:
>
> I followed all the procedures indicated on the Swift site to instal
I’ve had good luck with being able to click the candidates in cases
like this so Xcode will navigate to those bits of code. However, in this case I
think the issue is that the candidates weren’t from user code but from the
standard library, which Xcode has all sorts of issues navigating
> As usual the candidates are unknown.
Just on this particular note, this is a terrible presentation issue and totally
something we Apple people need to fix in Xcode, but you can usually see what
the candidates were in the build log.
Jordan
> On Feb 16, 2017, at 07:56, J.E. Schotsman via swif
On 16 Feb 2017, at 15:59, Biala via swift-users wrote:
> I have to implement a callback method that is called by the API. As a
> variable I get a class with void * member. I have to allocate some object in
> memory and assign this void* member to point to it.
I don’t really understand this qu
DispatchTimeInterval.nanoseconds expects an Int, while uptimeNanoseconds is an
UInt64 (an thus so is their difference). You can “fix” this by adding an
explicit cast:
func -(time1: DispatchTime, time2: DispatchTime) -> DispatchTimeInterval {
return DispatchTimeInterval.nanoseconds(Int(ti
Hello,
Using the Apple core audio I come to this problem: I have to implement a
callback method that is called by the API. As a variable I get a class with
void * member. I have to allocate some object in memory and assign this void*
member to point to it.How can I do this in SWIFT?
Regards,Ale
Hi!
Sorry for my noobness. I have two questions that may or may not be very apt.
1) How do I search through the threads of the mailing list? I'm looking for
answers to Q2
2) What kind of environment can I set up for programming for Swift on
Linux? I have a slow, old pc, so I can't quite afford th
I followed all the procedures indicated on the Swift site to install
Swift on Ubuntu 4.16, but when I enter the terminal command "swift"
gives me this error: can not execute binary file: executable format can
invalid, help me solve the problem, thank you. ;-)
Hello, list!
I am trying to find my way around Swift’s protocol limitations. It appears that
in general, any protocol with declared associatedtype will break polymorphism?
Take the case below which does not compile. All "Thing” instances are
"Something” but they can’t be passed around or coerce
I don’t know about the candidates
But the uptimeNanoseconds is a UInt64 and as such you should probably use
substractWithOverflow.
var a: UInt64 = 12
var b: UInt64 = 25
let result = UInt64.subtractWithOverflow(a, b)
if result.overflow {
print("Overflow")
} else {
let answer = result.0
Hello,
I am trying to define an operator that subtracts dispatch times:
#import Dispatch
func -( time1: DispatchTime, time2: DispatchTime ) -> DispatchTimeInterval
{
return DispatchTimeInterval.nanoseconds( time2.uptimeNanoseconds -
time1.uptimeNanoseconds )
}
Compiler
Excellent!
I had not seen the bitPattern initializer before…
Regards,
Rien
Site: http://balancingrock.nl
Blog: http://swiftrien.blogspot.com
Github: http://github.com/Balancingrock
Project: http://swiftfire.nl
> On 16 Feb 2017, at 14:47, Martin R wrote:
>
> // Int to pointer:
> let ptr =
// Int to pointer:
let ptr = UnsafePointer(bitPattern: 123)!
print(ptr) // 0x007b
// Pointer to Int:
let int = Int(bitPattern: ptr)
print(int) // 123
Int has the same size as a pointer on both 32-bit and 64-bit platforms.
Regards, Martin
> On 16 Feb 2017, at 14:27, Rien via swift-us
What would be the easiest (and fastest) way to convert a pointer to an
(unsigned)integer?
Ptr -> String -> Int
seems a bit cumbersome to me :-)
Regards,
Rien
Site: http://balancingrock.nl
Blog: http://swiftrien.blogspot.com
Github: http://github.com/Balancingrock
Project: http://swiftfire.nl
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