30Private Shared ReadOnly s_conversionTable As ConversionClass()() 37Const bad_ As ConversionClass = ConversionClass.Bad 38Const iden As ConversionClass = ConversionClass.Identity 39Const wide As ConversionClass = ConversionClass.Widening 40Const narr As ConversionClass = ConversionClass.Narrowing 41Const none As ConversionClass = ConversionClass.None 45s_conversionTable = New ConversionClass(max)() _ 47New ConversionClass(max) {bad_, bad_, bad_, bad_, bad_, bad_, bad_, bad_, bad_, bad_, bad_, bad_, bad_, bad_, bad_, bad_, bad_, bad_, bad_}, 48New ConversionClass(max) {bad_, iden, bad_, wide, wide, wide, wide, wide, wide, wide, wide, wide, wide, wide, wide, wide, wide, bad_, wide}, 49New ConversionClass(max) {bad_, bad_, bad_, bad_, bad_, bad_, bad_, bad_, bad_, bad_, bad_, bad_, bad_, bad_, bad_, bad_, bad_, bad_, bad_}, 50New ConversionClass(max) {bad_, narr, bad_, iden, none, narr, narr, narr, narr, narr, narr, narr, narr, narr, narr, narr, none, bad_, narr}, 51New ConversionClass(max) {bad_, narr, bad_, none, iden, none, none, none, none, none, none, none, none, none, none, none, none, bad_, narr}, 52New ConversionClass(max) {bad_, narr, bad_, narr, none, iden, narr, narr, narr, narr, narr, narr, narr, narr, narr, narr, none, bad_, narr}, 53New ConversionClass(max) {bad_, narr, bad_, narr, none, narr, iden, narr, narr, narr, narr, narr, narr, narr, narr, narr, none, bad_, narr}, 54New ConversionClass(max) {bad_, narr, bad_, narr, none, wide, wide, iden, narr, narr, narr, narr, narr, narr, narr, narr, none, bad_, narr}, 55New ConversionClass(max) {bad_, narr, bad_, narr, none, narr, wide, narr, iden, narr, narr, narr, narr, narr, narr, narr, none, bad_, narr}, 56New ConversionClass(max) {bad_, narr, bad_, narr, none, wide, wide, wide, wide, iden, narr, narr, narr, narr, narr, narr, none, bad_, narr}, 57New ConversionClass(max) {bad_, narr, bad_, narr, none, narr, wide, narr, wide, narr, iden, narr, narr, narr, narr, narr, none, bad_, narr}, 58New ConversionClass(max) {bad_, narr, bad_, narr, none, wide, wide, wide, wide, wide, wide, iden, narr, narr, narr, narr, none, bad_, narr}, 59New ConversionClass(max) {bad_, narr, bad_, narr, none, narr, wide, narr, wide, narr, wide, narr, iden, narr, narr, narr, none, bad_, narr}, 60New ConversionClass(max) {bad_, narr, bad_, narr, none, wide, wide, wide, wide, wide, wide, wide, wide, iden, narr, wide, none, bad_, narr}, 61New ConversionClass(max) {bad_, narr, bad_, narr, none, wide, wide, wide, wide, wide, wide, wide, wide, wide, iden, wide, none, bad_, narr}, 62New ConversionClass(max) {bad_, narr, bad_, narr, none, wide, wide, wide, wide, wide, wide, wide, wide, narr, narr, iden, none, bad_, narr}, 63New ConversionClass(max) {bad_, narr, bad_, none, none, none, none, none, none, none, none, none, none, none, none, none, iden, bad_, narr}, 64New ConversionClass(max) {bad_, bad_, bad_, bad_, bad_, bad_, bad_, bad_, bad_, bad_, bad_, bad_, bad_, bad_, bad_, bad_, bad_, bad_, bad_}, 65New ConversionClass(max) {bad_, narr, bad_, narr, wide, narr, narr, narr, narr, narr, narr, narr, narr, narr, narr, narr, narr, bad_, iden} 180Friend Shared Function ClassifyConversion(ByVal targetType As System.Type, ByVal sourceType As System.Type, ByRef operatorMethod As Method) As ConversionClass 187Dim result As ConversionClass = ClassifyPredefinedConversion(targetType, sourceType) 189If result = ConversionClass.None AndAlso 202Friend Shared Function ClassifyIntrinsicConversion(ByVal targetTypeCode As TypeCode, ByVal sourceTypeCode As TypeCode) As ConversionClass 209Friend Shared Function ClassifyPredefinedCLRConversion(ByVal targetType As System.Type, ByVal sourceType As System.Type) As ConversionClass 218If targetType Is sourceType Then Return ConversionClass.Identity 222Return ConversionClass.Widening 226Return ConversionClass.Narrowing 236Return ConversionClass.Narrowing 240Return ConversionClass.Narrowing 245Return ConversionClass.Narrowing 247Return ConversionClass.None 251Return ConversionClass.Narrowing 262Return ConversionClass.Widening 264Return ConversionClass.None 270Return ConversionClass.Widening 272Return ConversionClass.Narrowing 284Return ConversionClass.Narrowing 286Return ConversionClass.Widening 290Return ConversionClass.None 296Return ConversionClass.None 301Dim classification As ConversionClass = 304If classification = ConversionClass.Widening OrElse 305classification = ConversionClass.Identity Then 309Return ConversionClass.Widening 315Dim classification As ConversionClass = 318If classification = ConversionClass.Widening OrElse 319classification = ConversionClass.Identity Then 323Return ConversionClass.Widening 327Return IIf(IsInterface(targetType), ConversionClass.Narrowing, ConversionClass.None) 337Return ConversionClass.Narrowing 340Return ConversionClass.None 352Return ConversionClass.None 355Return ConversionClass.None 360Private Shared Function ClassifyCLRArrayToInterfaceConversion(ByVal targetInterface As System.Type, ByVal sourceArrayType As System.Type) As ConversionClass 368Return ConversionClass.Widening 374Return ConversionClass.Narrowing 394Dim conversion As ConversionClass = ConversionClass.None 418If (conversion = ConversionClass.Identity OrElse 419conversion = ConversionClass.Widening) Then 421Return ConversionClass.Widening 424Return ConversionClass.Narrowing 430Private Shared Function ClassifyCLRConversionForArrayElementTypes(ByVal targetElementType As System.Type, ByVal sourceElementType As System.Type) As ConversionClass 455Return ConversionClass.Identity 460Return ConversionClass.Widening 465Return ConversionClass.Narrowing 469Return ConversionClass.None 474Friend Shared Function ClassifyPredefinedConversion(ByVal targetType As System.Type, ByVal sourceType As System.Type) As ConversionClass 481If targetType Is sourceType Then Return ConversionClass.Identity 493Return ConversionClass.Narrowing 502Return ConversionClass.Widening 513Return ConversionClass.Widening 518Return ConversionClass.Narrowing 567Dim result As ConversionClass = ClassifyPredefinedConversion(larger, smaller) 569Return result = ConversionClass.Widening OrElse result = ConversionClass.Identity 579Dim result As ConversionClass = ClassifyPredefinedConversion(larger, smaller) 581Return result = ConversionClass.Narrowing OrElse result = ConversionClass.Identity 793ClassifyPredefinedConversion(resultType, inputType) <> ConversionClass.None Then 874ByRef operatorMethod As Method) As ConversionClass 876Dim result As ConversionClass 883Return ConversionClass.None 931ByRef foundSourceTypeOperators As Boolean) As ConversionClass 944Debug.Assert(ClassifyPredefinedConversion(targetType, sourceType) = ConversionClass.None, 958Return ConversionClass.None 975Return ConversionClass.Widening 996Return ConversionClass.Narrowing 1000Return ConversionClass.None 1010Return ConversionClass.Ambiguous 1024Friend Classification As ConversionClass 1080ByVal classification As ConversionClass, 1101ByRef classification As ConversionClass, 1118classification = ConversionClass.Bad

2548Debug.Assert(ClassifyPredefinedConversion(TargetType, SourceType) = ConversionClass.None OrElse 2549ClassifyPredefinedConversion(TargetType, SourceType) = ConversionClass.Narrowing, 2582If ClassifyPredefinedConversion(TargetType, SourceType) = ConversionClass.None AndAlso 2608Dim Result As ConversionClass = 2612Debug.Assert(Result = ConversionClass.Widening OrElse Result = ConversionClass.Narrowing, 2653ElseIf Result = ConversionClass.Ambiguous Then 2677If ClassifyPredefinedConversion(TargetType, SourceType) = ConversionClass.None AndAlso 2683Dim Result As ConversionClass =

64Dim leftToRight As ConversionClass = ClassifyConversion(type2, type1, Nothing) 65If leftToRight = ConversionClass.Identity OrElse leftToRight = ConversionClass.Widening Then 69Dim rightToLeft As ConversionClass = ClassifyConversion(type1, type2, Nothing) 70If rightToLeft = ConversionClass.Widening Then

172Dim leftToRight As ConversionClass = ClassifyConversion(rightType, leftType, operatorMethod) 174If leftToRight = ConversionClass.Identity Then Return 176If leftToRight = ConversionClass.Widening Then 179ClassifyConversion(leftType, rightType, operatorMethod) = ConversionClass.Widening Then 206Dim rightToLeft As ConversionClass = ClassifyConversion(leftType, rightType, operatorMethod) 208If rightToLeft = ConversionClass.Widening Then 936Dim conversionResult As ConversionClass = ClassifyConversion(targetType, sourceType, Nothing) 940Case ConversionClass.Identity, ConversionClass.Widening 943Case ConversionClass.Narrowing 968IIf(conversionResult = ConversionClass.Ambiguous, 1226Dim conversionResult As ConversionClass = ClassifyConversion(parameterType, argumentType, Nothing) 1227Return conversionResult = ConversionClass.Widening OrElse conversionResult = ConversionClass.Identity