Struct serde_with::FromInto [−][src]
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
Deserialize this value from the given Serde deserializer.
Serialize this value into the given Serde serializer.
Auto Trait Implementations
impl<T> RefUnwindSafe for FromInto<T> where
T: RefUnwindSafe,
impl<T> UnwindSafe for FromInto<T> where
T: UnwindSafe,
Blanket Implementations
Mutably borrows from an owned value. Read more