Method require

atomic-core/src/change/format_v3/hash_table.rs:330–334

Look up the index for a hash, returning an error if not found. This is a convenience method that wraps [`lookup`](Self::lookup) and converts `None` to [`FormatError::HashNotFound`]. # Arguments `hash` - The 32-byte hash to look up. # Errors - [`FormatError::HashNotFound`] if the hash isn't in the table. # Examples ```rust use atomic_core::change::format_v3::HashDedupTable; let self_hash =

(&self, hash: &[u8; 32])

    /// assert!(table.require(&[99u8; 32]).is_err());
    /// ```
    pub fn require(&self, hash: &[u8; 32]) -> FormatResult<HashIndex> {
        self.lookup(hash).ok_or_else(|| FormatError::HashNotFound {
            hash: data_encoding::BASE32_NOPAD.encode(&hash[..8]),
        })
    }

    /// Resolve an index back to its 32-byte hash.
    ///