Struct serde_with::FromInto
source · [−]pub struct FromInto<T>(_);
Expand description
Serialize value by converting to/from a proxy type with serde support.
This adapter serializes a type O
by converting it into a second type T
and serializing T
.
Deserializing works analogue, by deserializing a T
and then converting into O
.
struct S {
#[serde_as(as = "FromInto<T>")]
value: O,
}
For serialization O
needs to be O: Into<T> + Clone
.
For deserialization the opposite T: Into<O>
is required.
The Clone
bound is required since serialize
operates on a reference but Into
implementations on references are uncommon.
Note: TryFromInto
is the more generalized version of this adapter which uses the TryInto
trait instead.
Example
#[derive(Clone, Debug, PartialEq)]
struct Rgb {
red: u8,
green: u8,
blue: u8,
}
impl From<(u8, u8, u8)> for Rgb { ... }
impl From<Rgb> for (u8, u8, u8) { ... }
#[serde_as]
#[derive(Deserialize, Serialize)]
struct Color {
#[serde_as(as = "FromInto<(u8, u8, u8)>")]
rgb: Rgb,
}
let color = Color {
rgb: Rgb {
red: 128,
green: 64,
blue: 32,
},
};
// Define our expected JSON form
let j = json!({
"rgb": [128, 64, 32],
});
// Ensure serialization and deserialization produce the expected results
assert_eq!(j, serde_json::to_value(&color).unwrap());
assert_eq!(color, serde_json::from_value(j).unwrap());
Trait Implementations
sourceimpl<'de, T, U> DeserializeAs<'de, T> for FromInto<U> where
U: Into<T>,
U: Deserialize<'de>,
impl<'de, T, U> DeserializeAs<'de, T> for FromInto<U> where
U: Into<T>,
U: Deserialize<'de>,
sourcefn deserialize_as<D>(deserializer: D) -> Result<T, D::Error> where
D: Deserializer<'de>,
fn deserialize_as<D>(deserializer: D) -> Result<T, D::Error> where
D: Deserializer<'de>,
Deserialize this value from the given Serde deserializer.
sourceimpl<T, U> SerializeAs<T> for FromInto<U> where
T: Into<U> + Clone,
U: Serialize,
impl<T, U> SerializeAs<T> for FromInto<U> where
T: Into<U> + Clone,
U: Serialize,
sourcefn serialize_as<S>(source: &T, serializer: S) -> Result<S::Ok, S::Error> where
S: Serializer,
fn serialize_as<S>(source: &T, serializer: S) -> Result<S::Ok, S::Error> where
S: Serializer,
Serialize this value into the given Serde serializer.
impl<T: Copy> Copy for FromInto<T>
Auto Trait Implementations
impl<T> RefUnwindSafe for FromInto<T> where
T: RefUnwindSafe,
impl<T> Send for FromInto<T> where
T: Send,
impl<T> Sync for FromInto<T> where
T: Sync,
impl<T> Unpin for FromInto<T> where
T: Unpin,
impl<T> UnwindSafe for FromInto<T> where
T: UnwindSafe,
Blanket Implementations
sourceimpl<T> BorrowMut<T> for T where
T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized,
const: unstable · sourcefn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
Mutably borrows from an owned value. Read more