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The VB6 AI Migrator typing engine is able to infer the correct data type of undefined or Variant-type variables, and assign them the correct data type. In some scenarios, a variant-type variable is upgraded to a scalar value; this type inference is done over the variable usage and context.
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Public Sub ForcedToScalar(b As Boolean) Dim v As Variant If b Then Set v = Form1 MsgBox v / 3 Else Set v = Class1 End If MsgBox v End Sub Public Function Exists(col As Collection, Index As String) As Boolean Dim o As Variant On Error GoTo Error o = col(Index) Error: MsgBox "Fail Test" End Function
Public Sub ForcedToScalar(ByRef b AsBoolean) Dim Class1 As Form1 Dim v As Form1 If b Then v = Me 'UPGRADE_WARNING: (1068) v of type Form1 is being forced to Double. MessageBox.Show(CStr(CDbl(v) / 3), Application.ProductName) Else v = Class1 EndIf 'UPGRADE_WARNING: (1068) v of type Form1 is being forced to String. MessageBox.Show(CStr(v),Application.ProductName) End Sub Public Function Exists(ByVal col As OrderedDictionary, ByVal Index As String) As Boolean Dim o As Object Try 'UPGRADE_WARNING: (1068) col() of type Variant is being forced to Scalar. o = ReflectionHelper.GetPrimitiveValue(col(Index)) Catch End Try MessageBox.Show("Fail Test", My.Application.Info.Title) End Function
public void ForcedToScalar( bool b) { Form1 Class1 = null; Form1 v = null; if (b) { v = Form1.DefInstance; //UPGRADE_WARNING: (1068) v of type Form1 is being forced to double. MessageBox.Show((((double) v) / 3).ToString(), Application.ProductName); } else { v = Class1; } //UPGRADE_WARNING: (1068) v of type Form1 is being forced to string. MessageBox.Show((string) v, Application.ProductName); } internal static bool Exists(OrderedDictionary col, string Index) { object o = null; try { //UPGRADE_WARNING: (1068) col() of type Variant is being forced to Scalar. o = ReflectionHelper.GetPrimitiveValue(col[Index]); } catch { } MessageBox.Show("Fail Test", AssemblyHelper.GetTitle(System.Reflection.Assembly.GetExecutingAssembly())); return false; }