Trait Extract 

pub trait Extract<T>: Sized {
    // Required method
    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

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

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.

Implementations on Foreign Types

impl<T> Extract<T> for bool

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

impl<T> Extract<T> for f64

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

impl<T> Extract<T> for i64

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

impl<T> Extract<T> for String

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

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

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

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

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

Implementors

impl<T> Extract<T> for Bytes

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