How to make a (nonmutating) method pass self __owned?

Using Swift
1

not sure if this makes sense, but is there a way to mark a non-mutating instance method in swift 5.8 so that it passes self __owned by default?

public
struct S
{
    let x:[Int]
}

extension S
{
    public
    func y() -> [Int]
    {
        var x:[Int] = self.x
        x.append(0)
        return x
    }
}

import struct S.S

func test(_ s:__owned S)
{
    // how to prevent this from copying?
    let y:[Int] = s.y()
}

i would really rather not have to @inlinable the S.y method, and turning it into a static function that takes an instance of S __owned just feels awkward.

2

Use the __consuming func modifier to pass self owned.

1 Like
3

thanks!

1 Like