Struct Index 

pub struct Index<T, K> {
    pub position: usize,
    pub name: &'static str,
    /* private fields */
}

A handle to one of T’s secondary indexes, naming the field it covers and the type of that field.

#[derive(Mvcc)] emits one of these as an associated const per indexed field, named after the field in upper case — #[mvcc(index)] owner: u64 becomes Item::OWNER: Index<Item, u64>. Scans take the const rather than a name and a range, so both are checked at compile time: a wrong name is an unresolved item, and a range whose type does not match the indexed field fails to unify with K instead of silently matching nothing.

It is Copy and holds only a position, so passing one costs nothing.

Fields

position: usize

Position in Versioned::indexes.

name: &'static str

The indexed field’s name, for diagnostics.

Trait Implementations

impl<T, K> Clone for Index<T, K>

fn clone(&self) -> Self

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<T, K> Copy for Index<T, K>

impl<T, K> Debug for Index<T, K>

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.