The Character type is essentially defined like this [1]:
struct Character {
enum Representation {
// A _StringBuffer whose first grapheme cluster is self.
// NOTE: may be more than 1 Character long.
case large(_StringBuffer._Storage)
case small(Builtin.Int63)
}
var _representation: Representation
}
Note the type of the associated value for `case .small`, `Builtin.Int63`.
Presumably, this is so that the type fits into a single word, including the
single bit that is needed for the enum case.
However, `MemoryLayout<Character>.size` returns 9. Given the above, I would
have expected 8 bytes.
Why? Is this a potential optimization that hasn't been implemented? Or am I
missing something?
Thanks
Ole
[1]:
https://github.com/apple/swift/blob/master/stdlib/public/core/Character.swift
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