Does Swift have something like “ref” keyword that forces parameter to be passed by reference?

Question

In Swift, structs and value types are passed by value by default, just like in C#. But C# also has a very usable ref keyword, that forces the parameter to be passed by refer

Answer 1

Use the inout qualifier for a function parameter.

func swapTwoInts(a: inout Int, b: inout Int) {
    let temporaryA = a
    a = b
    b = temporaryA
}

swapTwoInts(&someInt, &anotherInt)

See Function Parameters and Return Values in the docs.