Question

Is there a way to use operators as functions without declaring them manually?

Func<bool, bool> not = x => !x;

Similar to (+)/(-) in Haskell. Would be handy in various LINQ scenarios involving conditional query construction. Maybe some C# (4.0+) trick I don’t know about.

Edit: here is a sample to clarify what I mean:

 int MyWhere(Func<bool, bool, bool> cond) {}

a usual call would be:

MyWhere((x,y) => x && y)

a cool call would be (assuming Haskell style):

MyWhere((&&))

Answer 1

No.

You can find the definitions (F12 in VS) for the operators you can overload, and there exists a

 // struct Double
 public static bool operator ==(double left, double right);

But there is no way to call Double.operator==(a, b).

The Framework does offer a a.Equals(b) for this particualr case, but there is no a.Add(b).