Trait AsField 

pub trait AsField: Sealed {
    // Required method
    fn as_field(&self, metadata: &Metadata<'_>) -> Option<Field>;
}

Trait implemented to allow a type to be used as a field key.

Note: Although this is implemented for both the
Field type and any
type that can be borrowed as an &str, only Field
allows O(1) access.
Indexing a field with a string results in an iterative search that performs
string comparisons. Thus, if possible, once the key for a field is known, it
should be used whenever possible.

Required Methods

fn as_field(&self, metadata: &Metadata<'_>) -> Option<Field>

Attempts to convert &self into a Field with the specified metadata.

If metadata defines this field, then the field is returned. Otherwise, this returns None.

Dyn Compatibility

This trait is dyn compatible.

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

Implementations on Foreign Types

impl AsField for str

fn as_field(&self, metadata: &Metadata<'_>) -> Option<Field>

Implementors

impl AsField for &Field

impl AsField for Field