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Avoid copying in Dynamic.

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This commit is contained in:
Stephen Chung
2020-04-30 22:52:36 +08:00
parent 60b52c142e
commit 4f91e7fbcf
2 changed files with 102 additions and 129 deletions
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30
src/any.rs
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@@ -252,6 +252,12 @@ impl Clone for Dynamic {
}
}
impl Default for Dynamic {
fn default() -> Self {
Self(Union::Unit(()))
}
}
/// Cast a Boxed type into another type.
fn cast_box<X: Variant, T: Variant>(item: Box<X>) -> Result<T, Box<X>> {
// Only allow casting to the exact same type
@@ -359,22 +365,16 @@ impl Dynamic {
return cast_box::<_, T>(Box::new(self)).ok();
}
match &self.0 {
Union::Unit(value) => (value as &dyn Variant).downcast_ref::<T>().cloned(),
Union::Bool(value) => (value as &dyn Variant).downcast_ref::<T>().cloned(),
Union::Str(value) => (value.as_ref() as &dyn Variant)
.downcast_ref::<T>()
.cloned(),
Union::Char(value) => (value as &dyn Variant).downcast_ref::<T>().cloned(),
Union::Int(value) => (value as &dyn Variant).downcast_ref::<T>().cloned(),
match self.0 {
Union::Unit(ref value) => (value as &dyn Variant).downcast_ref::<T>().cloned(),
Union::Bool(ref value) => (value as &dyn Variant).downcast_ref::<T>().cloned(),
Union::Str(value) => cast_box::<_, T>(value).ok(),
Union::Char(ref value) => (value as &dyn Variant).downcast_ref::<T>().cloned(),
Union::Int(ref value) => (value as &dyn Variant).downcast_ref::<T>().cloned(),
#[cfg(not(feature = "no_float"))]
Union::Float(value) => (value as &dyn Variant).downcast_ref::<T>().cloned(),
Union::Array(value) => (value.as_ref() as &dyn Variant)
.downcast_ref::<T>()
.cloned(),
Union::Map(value) => (value.as_ref() as &dyn Variant)
.downcast_ref::<T>()
.cloned(),
Union::Float(ref value) => (value as &dyn Variant).downcast_ref::<T>().cloned(),
Union::Array(value) => cast_box::<_, T>(value).ok(),
Union::Map(value) => cast_box::<_, T>(value).ok(),
Union::Variant(value) => value.as_ref().as_ref().downcast_ref::<T>().cloned(),
}
}