C#, default parameter value for an IntPtr

Question

I'd like to use a default parameter value of IntPtr.Zero in a function that takes an IntPtr as an argument. This is not possible as IntPtr.Zero is not a compile time constant.

Is there any way I can do what I want?

Prelude

Answer 1

Somewhat unintuitive, to put it mildly, you get it by using the new operator:

    void Foo(IntPtr arg = new IntPtr()) { 
    }

That was for fun, you probably enjoy this one better:

    void Foo(IntPtr arg = default(IntPtr)) { 
    }

Jenine

Darn, I had a hunch that "default" might work, but no compiler nearby to check - so played it safe. Good answer. – Copperas

Answer 2

Since IntPtr is a struct, you could use Nullable-of-T?

static void SomeMethod(IntPtr? ptr = null) {
    var actualPtr = ptr ?? IntPtr.Zero;
    //...
 }

Copperas

Answer 3

Note that using only default works as well:

void Foo(IntPtr arg = default) 
{ 
}

Censorious