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Anchor · medium

33. Anchor: Error Codes and require! Macro

Custom error handling in Anchor.

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The `#[error_code]` enum defines custom errors. The `require!` macro asserts boolean conditions and returns errors.

rust
#[error_code]
pub enum VaultError {
    #[msg("Insufficient vault balance")]
    InsufficientBalance,
}

require!(vault.balance >= amount, VaultError::InsufficientBalance);

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