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Anchor · hard

37. Anchor: Zero-Copy and AccountLoader

Managing large accounts with zero-copy deserialization.

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For accounts larger than a few kilobytes, `AccountLoader<'info, T>` with `#[account(zero_copy)]` maps data directly from the account buffer without heap allocation.

rust
#[account(zero_copy)]
pub struct BigOrderBook {
    pub orders: [Order; 500],
}

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Check your understanding

1. When should you use AccountLoader and zero_copy in Anchor?
For large account data structures that exceed SBF heap limits (32KB)For simple countersFor token mints onlyFor private functions
2. What method accesses mutable zero-copy account data in Anchor?
ctx.accounts.loader.load_mut()?ctx.accounts.loader.get()loader.data()loader.deserialize()

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