Struct EvolutionSpec 

pub struct EvolutionSpec<'a> {
    pub migrates_from: Option<u32>,
    pub changes: &'a [FieldChange<'a>],
}

How a schema version relates to the one before it.

Fields

migrates_from: Option<u32>

The version this one migrates from, or None for the genesis version.

changes: &'a [FieldChange<'a>]

Field-level changes relative to the predecessor.

Implementations

impl EvolutionSpec<'_>

pub const GENESIS: EvolutionSpec<'static>

The genesis evolution: no predecessor, no changes.

Trait Implementations

impl<'a> Clone for EvolutionSpec<'a>

fn clone(&self) -> EvolutionSpec<'a>

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<'a> Copy for EvolutionSpec<'a>

impl<'a> Debug for EvolutionSpec<'a>

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

Formats the value using the given formatter.

impl<'a> Eq for EvolutionSpec<'a>

impl<'a> PartialEq for EvolutionSpec<'a>

fn eq(&self, other: &EvolutionSpec<'a>) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl<'a> StructuralPartialEq for EvolutionSpec<'a>