Add opt-in const generics support

Author: MOZGIII

Cargo.toml

@@ -17,3 +17,4 @@ portaudio = "0.7"
 [features]
 default = ["std"]
 std = []
+const_generics = []

src/lib.rs

@@ -13,6 +13,8 @@
 #![cfg_attr(not(feature = "std"), no_std)]
 #![cfg_attr(not(feature = "std"), feature(alloc, core_intrinsics))]
 
+#![cfg_attr(feature = "const_generics", feature(const_generics))]
+
 #[cfg(feature = "std")]
 extern crate core;
 

src/ring_buffer.rs

@@ -92,6 +92,27 @@ impl<T> SliceMut for Vec<T> {
     }
 }
 
+#[cfg(feature = "const_generics")]
+impl<T, const N: usize> Slice for [T; N] {
+    type Element = T;
+    #[inline]
+    fn slice(&self) -> &[Self::Element] {
+        &self[..]
+    }
+}
+#[cfg(feature = "const_generics")]
+impl<T, const N: usize> SliceMut for [T; N] {
+    #[inline]
+    fn slice_mut(&mut self) -> &mut [Self::Element] {
+        &mut self[..]
+    }
+}
+#[cfg(feature = "const_generics")]
+impl<T, const N: usize> FixedSizeArray for [T; N] {
+    const LEN: usize = N;
+}
+
+#[cfg(not(feature = "const_generics"))]
 macro_rules! impl_slice_for_arrays {
     ($($N:expr)*) => {
         $(
@@ -115,6 +136,7 @@ macro_rules! impl_slice_for_arrays {
     };
 }
 
+#[cfg(not(feature = "const_generics"))]
 impl_slice_for_arrays! {
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