Trait Extractor 

pub trait Extractor {
    // Required methods
    fn get(&self, key: &str) -> Option<&str>;
    fn keys(&self) -> Vec<&str>;

    // Provided method
    fn get_all(&self, key: &str) -> Option<Vec<&str>> { ... }
}

Available on crate features opentelemetry and trace only.

Extractor provides an interface for removing fields from an underlying struct like HashMap

Required Methods

fn get(&self, key: &str) -> Option<&str>

Get a value from a key from the underlying data.

fn keys(&self) -> Vec<&str>

Collect all the keys from the underlying data.

Provided Methods

fn get_all(&self, key: &str) -> Option<Vec<&str>>

Get all values from a key from the underlying data.

Dyn Compatibility

This trait is dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementors

impl<S> Extractor for HashMap<String, String, S>

where S: BuildHasher,