From 22935fccc62e4de81ab1b7f5178e7fced3b0d574 Mon Sep 17 00:00:00 2001
From: Raph Levien <raph.levien@gmail.com>
Date: Mon, 24 May 2021 14:25:13 -0700
Subject: [PATCH] Use const generics for IntoRefs

Yay! Now we can use an array of any size, slice, or vector.
---
 piet-gpu-hal/src/hub.rs | 38 +-------------------------------------
 1 file changed, 1 insertion(+), 37 deletions(-)

diff --git a/piet-gpu-hal/src/hub.rs b/piet-gpu-hal/src/hub.rs
index 116939c..2ad9651 100644
--- a/piet-gpu-hal/src/hub.rs
+++ b/piet-gpu-hal/src/hub.rs
@@ -502,43 +502,7 @@ impl<'a, T> IntoRefs<'a, T> for &'a [&'a T] {
     }
 }
 
-// TODO: this will benefit from const generics!
-impl<'a, T> IntoRefs<'a, T> for &'a [&'a T; 1] {
-    type Iterator = std::iter::Copied<std::slice::Iter<'a, &'a T>>;
-    fn into_refs(self) -> Self::Iterator {
-        self.into_iter().copied()
-    }
-}
-
-impl<'a, T> IntoRefs<'a, T> for &'a [&'a T; 2] {
-    type Iterator = std::iter::Copied<std::slice::Iter<'a, &'a T>>;
-    fn into_refs(self) -> Self::Iterator {
-        self.into_iter().copied()
-    }
-}
-
-impl<'a, T> IntoRefs<'a, T> for &'a [&'a T; 3] {
-    type Iterator = std::iter::Copied<std::slice::Iter<'a, &'a T>>;
-    fn into_refs(self) -> Self::Iterator {
-        self.into_iter().copied()
-    }
-}
-
-impl<'a, T> IntoRefs<'a, T> for &'a [&'a T; 4] {
-    type Iterator = std::iter::Copied<std::slice::Iter<'a, &'a T>>;
-    fn into_refs(self) -> Self::Iterator {
-        self.into_iter().copied()
-    }
-}
-
-impl<'a, T> IntoRefs<'a, T> for &'a [&'a T; 5] {
-    type Iterator = std::iter::Copied<std::slice::Iter<'a, &'a T>>;
-    fn into_refs(self) -> Self::Iterator {
-        self.into_iter().copied()
-    }
-}
-
-impl<'a, T> IntoRefs<'a, T> for &'a [&'a T; 6] {
+impl<'a, T, const N: usize> IntoRefs<'a, T> for &'a [&'a T; N] {
     type Iterator = std::iter::Copied<std::slice::Iter<'a, &'a T>>;
     fn into_refs(self) -> Self::Iterator {
         self.into_iter().copied()