Function read_map 

pub fn read_map<K, V, F, B>(
    len: usize,
    buf: &mut B,
    read_pair: F,
) -> Result<HashMap<K, V>, DecodeError>
where
    K: Hash + Eq,
    F: Fn(&mut B) -> Result<(K, V), DecodeError>,

Reads a map from the buffer and returns it as a HashMap.

This function is generic over the key and value types of the map, and it uses a provided function to read key-value pairs from the buffer.

Arguments

• len - The number of key-value pairs to read from the buffer.
• buf - A reference to the slice containing the encoded map data.
• read_pair - A function that reads a key-value pair from the buffer and returns it as a Result<(K, V), DecodeError>.

Returns

• Ok(HashMap<K, V>) - A HashMap containing the decoded key-value pairs if successful.
• Err(DecodeError) - An error if the decoding process fails.

Errors

This function will return an error if:

• The read_pair function returns an error while reading a key-value pair.

Type Parameters

• K - The type of the keys in the map. Must implement std::hash::Hash and Eq.
• V - The type of the values in the map.
• F - The type of the function used to read key-value pairs from the buffer.