Trait CompactLayout 

pub trait CompactLayout:
    Sized
    + Copy
    + Pod {
    const DISC: u8;
    const BODY_SIZE: usize = _;
    const COMPACT_LEN: usize = _;

    // Provided method
    fn validate_compact(data: &[u8]) -> ProgramResult { ... }
}

A zero-copy account layout stored in compact [disc:u8][body] form.

Safety

The blanket access methods overlay Self directly on account bytes starting at COMPACT_BODY_OFFSET. Implementing this trait asserts the same contract as crate::Pod for the body: alignment 1, no padding, every bit pattern valid, no internal pointers. The Pod supertrait carries that obligation; CompactLayout only adds the discriminator and the compact wire-length math.

Required Associated Constants

const DISC: u8

Discriminator stored at byte 0 of the account.

Provided Associated Constants

const BODY_SIZE: usize = _

Body size in bytes (the zero-copy struct).

const COMPACT_LEN: usize = _

Total compact wire length: 1 discriminator byte + body.

Provided Methods

fn validate_compact(data: &[u8]) -> ProgramResult

Validate that data is a compact account of this type.

Checks the buffer has exactly the fixed compact wire length and the discriminator at byte 0 matches. Deliberately does not read a layout_id or epoch.

Dyn Compatibility

This trait is not dyn compatible.

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

Implementors