Struct MassMapInner 

pub struct MassMapInner<R: MassMapReader, H: MassMapHashLoader = MassMapDefaultHashLoader> {
    pub header: MassMapHeader,
    pub meta: MassMapMeta,
    /* private fields */
}

Immutable hash map backed by a serialized massmap file.

A MassMap is created from a MassMapReader (typically a file) and provides low-latency lookups without loading the whole dataset into memory. Keys and values are deserialized on demand using serde and MessagePack.

Type Parameters

• K: key type stored in the map; must implement serde::Deserialize.
• V: value type stored in the map; must implement serde::Deserialize and Clone.
• R: reader that satisfies MassMapReader.
• H: hash loader used to reconstruct the BuildHasher from the persisted MassMapHashConfig.

Fields

header: MassMapHeader

Header serialized at the start of the massmap file.

meta: MassMapMeta

Metadata describing the layout and hashing strategy of the backing file.

Implementations

impl<R: MassMapReader, H: MassMapHashLoader> MassMapInner<R, H>

pub fn load(reader: R) -> Result<Self>

Constructs an untyped massmap from a MassMapReader implementation.

The method validates the leading header (magic number, metadata offset and length) and deserializes MassMapMeta. Any IO or deserialization errors are forwarded to the caller.

pub fn len(&self) -> u64

Returns the number of entries written into this map.

pub fn is_empty(&self) -> bool

Returns true if the map contains no entries.

pub fn info(&self) -> MassMapInfo

Returns information about the map’s structure and contents.

pub fn cast<K, V>(self) -> MassMap<K, V, R, H>

where K: for<'de> Deserialize<'de> + Eq + Hash, V: for<'de> Deserialize<'de> + Clone,

Casts this untyped massmap into a typed view with the specified key and value types.

Trait Implementations

impl<R: Debug + MassMapReader, H: Debug + MassMapHashLoader> Debug for MassMapInner<R, H>

where H::BuildHasher: Debug,

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.