Trait packs::Extract

pub trait Extract<T>: Sized {
    pub fn extract(from: Value<T>) -> Option<Self>;
}

A trait to denote types which can be extracted out of a Value<T>.

let value : Value<()> = Value::Integer(42);
assert_eq!(i64::extract(value), Some(42))

For each accessibility kind there is an Option variant, treating a Value as a Option<T>, where Value::Null denotes None and every other value is tried to get parsed into Some(t):

// any `Value::Null` is a `None`:
let value : Value<()> = Value::Null;
assert_eq!(<Option<String>>::extract(value), Some(None));

let value : Value<()> = Value::String(String::from("Hello World!"));
assert_eq!(<Option<String>>::extract(value), Some(Some(String::from("Hello World!"))));

Required methods

pub fn extract(from: Value<T>) -> Option<Self>

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Implementations on Foreign Types

impl<T> Extract<T> for i64

pub fn extract(from: Value<T>) -> Option<Self>

impl<T> Extract<T> for f64

pub fn extract(from: Value<T>) -> Option<Self>

impl<T> Extract<T> for bool

pub fn extract(from: Value<T>) -> Option<Self>

impl<T> Extract<T> for String

pub fn extract(from: Value<T>) -> Option<Self>

impl<T> Extract<T> for Vec<Value<T>>

pub fn extract(from: Value<T>) -> Option<Self>

impl<T, E: Extract<T>> Extract<T> for Option<E>

pub fn extract(from: Value<T>) -> Option<Self>

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Implementors

impl<T> Extract<T> for Bytes

pub fn extract(from: Value<T>) -> Option<Self>

impl<T> Extract<T> for Dictionary<T>

pub fn extract(from: Value<T>) -> Option<Self>

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