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60. Steel: The account! Macro & Bytemuck

Zero-copy account definitions.

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Steel's `account!` macro defines account types and integrates `bytemuck` Pod/Zeroable traits for zero-copy binary casting.

rust
use steel::*;

#[repr(C)]
#[derive(Clone, Copy, Debug, PartialEq, Pod, Zeroable)]
pub struct UserState {
    pub authority: Pubkey,
    pub balance: u64,
}

account!(UserState);

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Check your understanding

1. What does Steel's account! macro provide?
Implements AccountValidation and zero-copy traits for the structGenerates a databaseCreates a PDAEncrypts memory
2. Why must Steel account structs be annotated with #[repr(C)]?
Guarantees deterministic C memory layout for safe zero-copy byte castingEnables C++ interop onlyRequired by AnchorDisables memory safety

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