Question

So Google’s not a good choice for looking up examples for overloaded operators like “And” or “Or”, because it tries to parse them as operators to the search query itself. MSDN also provides no examples of how to implement an overloaded And operator, so I’m not certain how to properly overload it for my project.

Does anyone have an example of “And” at minimum? “Or” or “Xor” (or any others) would be a bonus. I’m not certain if I need to overload these operators in my objects just yet, as I’m still building them out and haven’t planned beyond just yet. But having examples around that might get indexed by Google will probably help save the sanity of a lot of people…

Answer 1

You overload the logical operators in the same way that you overload the unary or arithmetic operators.

I can’t actually think of a case where this would be useful at the moment, but for the sake of example, here’s a sample structure that overrides the And and Or operators:

Public Structure Foo

    Public Shared Operator And(ByVal val1 as Foo, ByVal val2 as Foo) As Foo
        ''#(calculate the logical And of the two specified values here)
        Return New Foo(val1.Bar And val2.Bar, val1.Baz And val2.Baz)
    End Operator

    Public Shared Operator Or(ByVal val1 as Foo, ByVal val2 as Foo) As Foo
        ''#(calculate the logical Or of the two specified values here)
        Return New Foo(val1.Bar Or val2.Bar, val1.Baz Or val2.Baz)
    End Operator

End Structure

This MSDN page gives some other examples and further explanation.