KeyedCollection.this

Initializes this. Adds item to this and connects to the signals emitted by item.

This just calls $(SRCTAG KeyedCollection.add).

Precondition:

assert(item(s) !is null);

  1. this(T item)
  2. this(I items)
    mixintemplate KeyedCollection(T)
    final
    this
    (
    I
    )
    ()
    if (
    isIterable!(I)
    )
  3. this()

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