D associative arrays - pass by value or pass by reference?

Question

Say I have an associative array of pointers to structs to strings, where the struct is called Foo; the type will be Foo*[string]. Suppose I also have a function with the following signature: void bar (Foo*[string] baz). Will baz be passed to bar by value or by reference? I've not found any documentation about this, and I'm curious.

Answer 1

By reference - any modifications to an existing AA will be observed outside of the function.

However, there is a corner case for when the associative array is null. In that case, initializing the AA by adding the first element will not be observed outside of the function. If the AA to be modified might be null, you should pass it by-ref.

Answer 2

It's like in Java. It's pass-by-value, but the value is a reference.
So you can't change the reference itself, but you can modify the AA it refers to.