Trait LayoutMigration 

pub trait LayoutMigration {
    const MIGRATIONS: &'static [MigrationEdge];
}

Layouts opt into in-place migration by providing a MIGRATIONS constant. The default (empty slice) means “no migrations declared” and any mismatch between header and AccountLayout::SCHEMA_EPOCH is a hard failure.

The trait is sealed-by-convention: downstream crates should express migrations via the #[hopper::migrate(...)] attribute macro and the hopper::layout_migrations! composition helper, never by hand-writing impl LayoutMigration for T.

Required Associated Constants

const MIGRATIONS: &'static [MigrationEdge]

Ordered migration chain. MIGRATIONS[i].to_epoch == MIGRATIONS[i + 1].from_epoch must hold for every adjacent pair, and the whole chain must be strictly monotonic.

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.

Implementors