Is there anything way to append to a Tuple or create a new tuple with additional elements?

[bcardarella (Brian Cardarella)]

I can't find any documentation on the Tuple type. At least not on apple.com

From what I have seen there isn't any way to append directly into an existing tuple, but is there a way to compose a new tuple from either an array of elements or produce a new tuple with additional elements?

[nikitamounier]

Indeed you can't append to an existing tuple, and composing a new tuple from an array of elements would require going through each element of the array and adding it to the tuple, which we can't. Maybe try looking into making a Result Builder (TupleBuilder)? That should give you more flexibility.

[phoneyDev (Stern)]

There's some low level shenanigans you can try:

Convert an Array (of known fixed size) to a tuple

To round this out, I wrote this as a global function, so that structs with tuple pseudo-arrays can be accessed without having to extend each one explicitly. My version: func withUnsafeMutableBufferPointer<Struct,Element,Tuple,R>( to value: inout Struct, at property: WritableKeyPath<Struct,Tuple>, using type: Element.Type, _ body: (UnsafeMutableBufferPointer<Element>) throws -> R) rethrows -> R { return try withUnsafeMutablePointer(to: &value [keyPath: property]) { le…

https://developer.apple.com/forums/thread/72120