Why is it ambiguous to call overloaded ambig(long) and ambig(unsigned long) with an integer literal?

You’re passing an int to this overloaded function. Although human intuition says that ambig(signed long) ought to be preferred because your input is a negative integer (which cannot be represented as such by an unsigned long), the two conversions are in fact equivalent in “precedence” in C++. That is, the conversion int → unsigned long … Read more

C# interface method ambiguity

Implement explicitly: public class AllYourBase : IBase1, IBase2 { int IBase1.Percentage { get{ return 12; } } int IBase2.Percentage { get{ return 34; } } } If you do this, you can of course treat your non-ambigous properties just like normal. IAllYourBase ab = new AllYourBase(); ab.SomeValue = 1234; However, if you want to access … Read more

No warning or error (or runtime failure) when contravariance leads to ambiguity

I believe the compiler does the better thing in VB.NET with the warning, but I still don’t think that is going far enough. Unfortunately, the “right thing” probably either requires disallowing something that is potentially useful(implementing the same interface with two covariant or contravariant generic type parameters) or introducing something new to the language. As … Read more

Django model with 2 foreign keys from the same table

I haven’t done this yet, but I used inspectdb to generate the models.py file from an existing DB that does exactly that – this is what inspectdb threw back, so it should work: creator = models.ForeignKey(Users, null=True, related_name=”creator”) assignee = models.ForeignKey(Users, null=True, related_name=”assignee”) Hope that works for you – if it doesn’t I am going … Read more

The variable ‘MyException’ is declared but never used

You can remove it like this: try { doSomething() } catch (AmbiguousMatchException) { doSomethingElse() } Use warning disable like this: try { doSomething() } #pragma warning disable 0168 catch (AmbiguousMatchException exception) #pragma warning restore 0168 { doSomethingElse() } Other familiar warning disable #pragma warning disable 0168 // variable declared but not used. #pragma warning disable … Read more

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)