1 files changed, 124 insertions, 0 deletions
diff --git a/vendor/zerovec/src/zerofrom_impls.rs b/vendor/zerovec/src/zerofrom_impls.rs
new file mode 100644
index 000000000..dfb3da187
--- /dev/null
+++ b/vendor/zerovec/src/zerofrom_impls.rs
@@ -0,0 +1,124 @@
+// This file is part of ICU4X. For terms of use, please see the file
+// called LICENSE at the top level of the ICU4X source tree
+// (online at: https://github.com/unicode-org/icu4x/blob/main/LICENSE ).
+
+use crate::map::ZeroMapKV;
+use crate::ule::*;
+use crate::vecs::{FlexZeroSlice, FlexZeroVec};
+use crate::{VarZeroSlice, VarZeroVec, ZeroMap, ZeroMap2d, ZeroSlice, ZeroVec};
+use zerofrom::ZeroFrom;
+
+impl<'zf, T> ZeroFrom<'zf, ZeroVec<'_, T>> for ZeroVec<'zf, T>
+where
+    T: 'static + AsULE + ?Sized,
+{
+    #[inline]
+    fn zero_from(other: &'zf ZeroVec<'_, T>) -> Self {
+        ZeroVec::new_borrowed(other.as_ule_slice())
+    }
+}
+
+impl<'zf, T> ZeroFrom<'zf, ZeroSlice<T>> for ZeroVec<'zf, T>
+where
+    T: 'static + AsULE + ?Sized,
+{
+    #[inline]
+    fn zero_from(other: &'zf ZeroSlice<T>) -> Self {
+        ZeroVec::new_borrowed(other.as_ule_slice())
+    }
+}
+
+impl<'zf, T> ZeroFrom<'zf, ZeroSlice<T>> for &'zf ZeroSlice<T>
+where
+    T: 'static + AsULE + ?Sized,
+{
+    #[inline]
+    fn zero_from(other: &'zf ZeroSlice<T>) -> Self {
+        other
+    }
+}
+
+impl<'zf> ZeroFrom<'zf, FlexZeroVec<'_>> for FlexZeroVec<'zf> {
+    #[inline]
+    fn zero_from(other: &'zf FlexZeroVec<'_>) -> Self {
+        FlexZeroVec::Borrowed(&*other)
+    }
+}
+
+impl<'zf> ZeroFrom<'zf, FlexZeroSlice> for FlexZeroVec<'zf> {
+    #[inline]
+    fn zero_from(other: &'zf FlexZeroSlice) -> Self {
+        FlexZeroVec::Borrowed(&*other)
+    }
+}
+
+impl<'zf> ZeroFrom<'zf, FlexZeroSlice> for &'zf FlexZeroSlice {
+    #[inline]
+    fn zero_from(other: &'zf FlexZeroSlice) -> Self {
+        other
+    }
+}
+
+impl<'zf, T> ZeroFrom<'zf, VarZeroSlice<T>> for VarZeroVec<'zf, T>
+where
+    T: 'static + VarULE + ?Sized,
+{
+    #[inline]
+    fn zero_from(other: &'zf VarZeroSlice<T>) -> Self {
+        other.into()
+    }
+}
+
+impl<'zf, T> ZeroFrom<'zf, VarZeroVec<'_, T>> for VarZeroVec<'zf, T>
+where
+    T: 'static + VarULE + ?Sized,
+{
+    #[inline]
+    fn zero_from(other: &'zf VarZeroVec<'_, T>) -> Self {
+        other.as_slice().into()
+    }
+}
+
+impl<'zf, T> ZeroFrom<'zf, VarZeroSlice<T>> for &'zf VarZeroSlice<T>
+where
+    T: 'static + VarULE + ?Sized,
+{
+    #[inline]
+    fn zero_from(other: &'zf VarZeroSlice<T>) -> Self {
+        other
+    }
+}
+
+impl<'zf, 's, K, V> ZeroFrom<'zf, ZeroMap<'s, K, V>> for ZeroMap<'zf, K, V>
+where
+    K: 'static + for<'b> ZeroMapKV<'b> + ?Sized,
+    V: 'static + for<'b> ZeroMapKV<'b> + ?Sized,
+    <K as ZeroMapKV<'zf>>::Container: ZeroFrom<'zf, <K as ZeroMapKV<'s>>::Container>,
+    <V as ZeroMapKV<'zf>>::Container: ZeroFrom<'zf, <V as ZeroMapKV<'s>>::Container>,
+{
+    fn zero_from(other: &'zf ZeroMap<'s, K, V>) -> Self {
+        ZeroMap {
+            keys: K::Container::zero_from(&other.keys),
+            values: V::Container::zero_from(&other.values),
+        }
+    }
+}
+
+impl<'zf, 's, K0, K1, V> ZeroFrom<'zf, ZeroMap2d<'s, K0, K1, V>> for ZeroMap2d<'zf, K0, K1, V>
+where
+    K0: 'static + for<'b> ZeroMapKV<'b> + ?Sized,
+    K1: 'static + for<'b> ZeroMapKV<'b> + ?Sized,
+    V: 'static + for<'b> ZeroMapKV<'b> + ?Sized,
+    <K0 as ZeroMapKV<'zf>>::Container: ZeroFrom<'zf, <K0 as ZeroMapKV<'s>>::Container>,
+    <K1 as ZeroMapKV<'zf>>::Container: ZeroFrom<'zf, <K1 as ZeroMapKV<'s>>::Container>,
+    <V as ZeroMapKV<'zf>>::Container: ZeroFrom<'zf, <V as ZeroMapKV<'s>>::Container>,
+{
+    fn zero_from(other: &'zf ZeroMap2d<'s, K0, K1, V>) -> Self {
+        ZeroMap2d {
+            keys0: K0::Container::zero_from(&other.keys0),
+            joiner: ZeroVec::zero_from(&other.joiner),
+            keys1: K1::Container::zero_from(&other.keys1),
+            values: V::Container::zero_from(&other.values),
+        }
+    }
+}