Function from_context 

pub fn from_context<C, F, R>(f: F) -> R
where
    F: FnOnce(Option<&C>) -> R,
    C: 'static,

Provides immutable access to the current context value

Type Parameters

• C - The type of the context value to access
• F - The function type that will operate on the context
• R - The return type from the function

Arguments

• f - A function that receives an Option<&C> and returns R

Examples

use with_async_context::from_context;

struct MyContext {
    some_value: String
}
let value = from_context(|ctx: Option<&MyContext>| {
    ctx.unwrap().some_value.clone()
});