FuturePromise.then

Undocumented in source. Be warned that the author may not have intended to support it.
  1. FuturePromise!R then(R delegate() handler)
  2. FuturePromise!R then(R delegate(T) handler)
    class FuturePromise(T)
    static if(!(is(T == void)))
    then
    (
    R
    )
    (
    R delegate
    (
    T
    )
    handler
    )

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