Implement AsPrimitive for NonZero*

Author: acrrd

src/cast.rs

@@ -934,3 +934,33 @@ impl_as_primitive!(f32 => { f32, f64 });
 impl_as_primitive!(f64 => { f32, f64 });
 impl_as_primitive!(char => { char });
 impl_as_primitive!(bool => {});
+
+macro_rules! impl_as_primitive_non_zero {
+    (@ $T: ty => $(#[$cfg:meta])* impl $U: ty ) => {
+        $(#[$cfg])*
+        impl AsPrimitive<$U> for $T {
+            #[inline] fn as_(self) -> $U { self.get() as $U }
+        }
+    };
+    (@ $T: ty => { $( $U: ty ),* } ) => {$(
+        impl_as_primitive_non_zero!(@ $T => impl $U);
+    )*};
+    ($T: ty => { $( $U: ty ),* } ) => {
+        impl_as_primitive_non_zero!(@ $T => { $( $U ),* });
+        impl_as_primitive_non_zero!(@ $T => { u8, u16, u32, u64, u128, usize });
+        impl_as_primitive_non_zero!(@ $T => { i8, i16, i32, i64, i128, isize });
+    };
+}
+
+impl_as_primitive_non_zero!(NonZeroU8 => { char, f32, f64 });
+impl_as_primitive_non_zero!(NonZeroI8 => { f32, f64 });
+impl_as_primitive_non_zero!(NonZeroU16 => { f32, f64 });
+impl_as_primitive_non_zero!(NonZeroI16 => { f32, f64 });
+impl_as_primitive_non_zero!(NonZeroU32 => { f32, f64 });
+impl_as_primitive_non_zero!(NonZeroI32 => { f32, f64 });
+impl_as_primitive_non_zero!(NonZeroU64 => { f32, f64 });
+impl_as_primitive_non_zero!(NonZeroI64 => { f32, f64 });
+impl_as_primitive_non_zero!(NonZeroU128 => { f32, f64 });
+impl_as_primitive_non_zero!(NonZeroI128 => { f32, f64 });
+impl_as_primitive_non_zero!(NonZeroUsize => { f32, f64 });
+impl_as_primitive_non_zero!(NonZeroIsize => { f32, f64 });