Derive Macro Payload 

#[derive(Payload)]
{
    // Attributes available to this derive:
    #[payload]
}

Derive macro that implements [ringdb::Payload] for a struct.

The storage strategy is selected with the #[payload(storage = "...")] attribute:

Value	Strategy	Requirement
"serde" (default)	bincode serialization, variable-size payloads	T: Serialize + DeserializeOwned
"pod"	raw bytes, zero-copy &T fetch	T: bytemuck::Pod

Examples

use serde::{Serialize, Deserialize};
use ringdb::Payload;

// Serde storage (default) — supports any serializable type
#[derive(Serialize, Deserialize, Payload)]
struct GeoRecord { lat: f64, lon: f64, label: String }

// Pod storage — zero-copy &T fetch, requires fixed-size plain-old-data
use bytemuck::{Pod, Zeroable};
#[derive(Copy, Clone, Pod, Zeroable, Payload)]
#[repr(C)]
#[payload(storage = "pod")]
struct GeoPoint { lat: f32, lon: f32, altitude: f32 }