Problem with using std.math: abs and std.complex: abs at the same time

H. S. Teoh hsteoh at
Wed Sep 18 15:23:50 UTC 2019

On Wed, Sep 18, 2019 at 12:37:28PM +0000, Simen Kjærås via Digitalmars-d-learn wrote:
> template MergeOverloads(T...) {
>     alias MergeOverloads = T[0];
>     static if (T.length > 1) {
>         alias MergeOverloads = MergeOverloads!(T[1..$]);
>     }
> }
> I would however label that a horrible hack.
> FWIW, I've filed this issue:

Horrible or not, it's very clever. I wouldn't have thought of that!

But yeah, the way alias can't be overloaded inside a function body is
kinda stupid, esp. seeing that aliasing an overload is exactly how you
resolve an analogous problem inside class scope:

	class Base {
		int abs(int);
	class Derived : Base {
		float abs(float); // causes ambiguity
		alias abs = Base.abs; // brings Base.abs into overload set
		void func() {
			// now abs(...) will correctly use overload sets

I would have expected you could do this in function scope as well, and
was surprised the compiler rejected it.


Famous last words: I wonder what will happen if I do *this*...

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