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Date: Wed, 11 Nov 2015 09:14:06 -0800 (PST)
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Subject: Comportamento HashSet(Of T).Add()
From: Antologiko <antologiko@gmail.com>
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Xref: csiph.com it.comp.lang.visual-basic:18561

Buonasera a tutti.
Ho la seguente struttura dati

Private Structure Link
    Dim ParentID As Long
    Dim ChildID As Long

    Friend Sub New(ParentID As Long, ChildID As Long)
        Me.ParentID =3D ParentID
        Me.ChildID =3D ChildID
    End Sub
End Structure

Adesso definisco le variabili

Dim Links As HashSet(Of Link) =3D New HashSet(Of Link)
Dim P As Long =3D ... un valore qualsiasi
Dim C As Long =3D ... un valore qualsiasi
Dim L1 As Link =3D New Link(P, C)
Dim L2 As Link =3D New Link(P, C)
Dim B As Boolean

Dopodich=E9 aggiungo i due link all'insieme

B =3D Links.Add(L1)
B =3D Links.Add(L2)

Nota: il metodo Add restituisce True solo se l'oggetto
viene aggiunto all'insieme, e questo accade solo se esso
non =E8 gi=E0 presente nell'insieme.

La domanda =E8: posso stare sicuro che per qualsiasi valore
dato a P e C, il secondo Add() restituir=E0 False?

Od in altre parole, come viene calcolato l'hashcode per le
strutture come Link?