34 lines
1.6 KiB
Plaintext
34 lines
1.6 KiB
Plaintext
== Why is this an issue?
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Numbers can be shifted with the `<<` and `>>` https://learn.microsoft.com/en-us/dotnet/visual-basic/language-reference/operators/bit-shift-operators[operators], but the right operand of the operation needs to be an `int` or a type that has an https://learn.microsoft.com/en-us/dotnet/visual-basic/programming-guide/language-features/data-types/implicit-and-explicit-conversions[implicit conversion] to `int`. However, when the left operand is an `object`, the compiler's type checking is turned off, so you can pass anything to the right of a shift operator and have it compile. And if the argument can't be implicitly converted to `int` at runtime, then a https://learn.microsoft.com/en-us/dotnet/api/microsoft.csharp.runtimebinder.runtimebinderexception[RuntimeBinderException] will be raised.
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[source,vbnet]
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----
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Dim o As Object = 5
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Dim x As Integer = 5
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x = o >> 5 ' Noncompliant
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x = x << o ' Noncompliant
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----
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=== Exceptions
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This rule does not raise when the left or the right expression is https://learn.microsoft.com/en-us/dotnet/visual-basic/language-reference/nothing[Nothing].
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[source,vbnet]
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----
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x = Nothing >> 5
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x = 5 << Nothing
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----
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== Resources
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=== Documentation
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* https://learn.microsoft.com/en-us/dotnet/visual-basic/language-reference/operators/bit-shift-operators[Bit Shift Operators]
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* https://learn.microsoft.com/en-us/dotnet/visual-basic/programming-guide/language-features/data-types/implicit-and-explicit-conversions[Implicit and Explicit Conversions]
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* https://learn.microsoft.com/en-us/dotnet/api/microsoft.csharp.runtimebinder.runtimebinderexception[RuntimeBinderException Class]
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include::../rspecator-dotnet.adoc[]
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