Questions tagged [inout]
98 questions
0
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How do you pass a chunk of an array to an inout function? Type-erasure?
I have a function
func doThing(inout array: [Int]) { //thing }
I have the array
var stuff = [0,1,2,3,4,5,6]
I want doThing to operate on just the first three elements.
doThing(&stuff[0..<3])
doesn't work since
var partOfStuff: ArraySlice =…
lanza
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Use the inout keyword when passing an NSManagedObjectContext into a function?
I'm working on my first real Core Data application and have been able to successfully pass the pointer to my managedObjectContext instance throughout my application using segues. I've run into a question however as I am at a crossroad where I need…
Dan Beaulieu
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1 answer
How to set a Inout parameter inside a closure
So my question is this:
I'm trying to implement a extension to CLGeoCoder to be able to get a city name from a CLLocation but I'm facing a problem when I try to set the inout city name string inside the completionhandler of the…
Martin
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2 answers
How to modify a two dimensional array passed to a function?
My function is as following
func helper(root: TreeNode?, _ result: [[Int]], _ list: [Int], _ sum: Int, _ total: Int) {
list.append(root!.val)
if(total + root!.val == sum && root?.left == nil && root?.right == nil) {
…
Xuting
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-1
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1 answer
Swift inherited protocols sent to functions as inout
The code below does not compile. I am trying to send a class to a function that changes that class, where the class conforms to a protocol. This protocol inherits from another base protocol. I would expect the compiler to know that s (SportsCar)…
-1
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2 answers
Inout vs pass by reference swift optimization
I have a very large list of numbers and I would like to pass it to a function to do some manipulations to it. Originally, I created a function with an inout property. As many know, inout in swift does NOT pass by reference, rather it makes an…
EK_AllDay
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1 answer
How to write columnwise in FORMAT in FORTRAN 77
I am using FORTRAN77 as a third party language on ANSYS computation software. Here we can write the entire row and columns to files during I/O operations. I am not able to however move the cursor to the first row and write column wise thereafter-…
Vikram
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"&" in "swap(&someInt, &anotherInt)". What does it represent? What is its function?
I'm new to Swift and I'm trying to learn the concept of 'inout' keyword. I saw this code in "the swift programming language 2.1". My question is, why is there a "&" in "swap(&someInt, &anotherInt)". What does it represent? What is its function?
func…
Thor
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