6. StdId
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## 6. StdId

Id generation routines.

    openId     :: Ids m => m Id
    openIds    :: Ids m => Int -> m [Id]

    openR2Id   :: Ids m => m (R2Id m r)
    openR2Ids  :: Ids m => Int -> m (R2Id m r)

    openRId    :: Ids m => m (RId x)
    openRIds   :: Ids m => Int -> m [RId x]

There is `Ids` type class, which allows the functions to be called both from `IO` and `GUI` monad.

`openId` returns one new id

`openIds` returns a list of N items i.e. [id1, id2..idN]

    openIds 3 = [id1, id2, id3]

`openRId`, `openRIds`, `openR2Id` and `openR2Ids` are the same as openId and openIds but they return special receiver and bi-receiver ids (see Section 13, “StdReceiver”).

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