Key

Each Key instance stores a per-strand value which is inherited by scoped strands. Background strands created by spawn and stream start fresh and do not inherit values.

Constructor

Key()

Creates a new strand-local key.

let key = strand.Key()

Fields

value

Gets or sets the value associated with this key in the current strand.

Defaults to nil when the key has not been set in the current strand.

let key = strand.Key()
assert_eq $key.value nil

key.value = "parent"
assert_eq $key.value "parent"

let results = strand.fork
  do
    assert_eq $key.value "parent"
    key.value = "child"
    key.value

assert_eq $results ["child"]
assert_eq $key.value "parent"