Re: [swift-users] Swift-C array interop with Swift 4/Xcode 9

Hey Chris, So I work with a C library and Swift as well and have a couple of ideas for you depending on how you work with the array. Here are some tricks I have used when passing around arrays from C to Swift to ObjC and never had issues with it. Also, while passing in the first element of the

Re: [swift-users] Swift-C array interop with Swift 4/Xcode 9

Hi Chris, Yes, he'll need to do withUnsafeMutablePointer(to: ) { transformationTuplePtr in withUnsafeMutablePointer(to: ) { projectionTuplePtr in transformationTuplePtr.withMemoryRebound(to: Float.self, capacity: 16) { transformationArrayPtr in

Re: [swift-users] Swift-C array interop with Swift 4/Xcode 9

Sorry to jump in here, and maybe I’m missing something obvious, but in your example Rick is two levels of closure deep and only has access to one of the arrays in his struct. In this case there is another array of floats he needs as an argument to his method call. Will he need to go through the

Re: [swift-users] Swift-C array interop with Swift 4/Xcode 9

Hi Rick, > On 21 Sep 2017, at 1:03 am, Rick Mann via swift-users > wrote: > > I've got Swift code wrapping a C API. One of the C structs the API uses looks > like this: > > typedef struct { >size_t size; >float transformation[16]; >float projection[16]; >

Re: [swift-users] Swift-C array interop with Swift 4/Xcode 9

Adding: it seems that while passing to an UnsafePointer parameter worked before (passed a pointer to a contiguous block of 16 floats), now it's making a copy of just the first tuple element, and passing a smaller memory block. I think I'm interpreting these results correctly like that. > On

[swift-users] Swift-C array interop with Swift 4/Xcode 9

I've got Swift code wrapping a C API. One of the C structs the API uses looks like this: typedef struct { size_t size; float transformation[16]; float projection[16]; uint32_t width; uint32_t height; } image_info_t; In Swift, the two array members are 16-tuples of floats.