Struct ManagedMapEncoded

pub struct ManagedMapEncoded<M, K, V>
where
    M: ManagedTypeApi,
{ /* private fields */ }

A managed map that works with any serializable key and value types.

It encodes both when saving, and decodes the value when getting.

Empty encodings

Just like the base ManagedMap, it makes no difference between a missing key and a key with a corresponding empty encoded value.

So, for instance, here contains returns false, because 0 is encoded as an empty buffer:

mme.put(&key, &0);
assert!(!mme.contains(&key));

Implementations

impl<M, K, V> ManagedMapEncoded<M, K, V>

where M: ManagedTypeApi,

pub fn new() -> Self

impl<M, K, V> ManagedMapEncoded<M, K, V>

where M: ManagedTypeApi + ErrorApi, K: TopEncode, V: TopEncode + TopDecode,

pub fn get(&self, key: &K) -> V

Retrieves and decodes value associated with key.

pub fn put(&mut self, key: &K, value: &V)

Since both the key and value are encoded before saving to the map, there is no need to take them owned.

pub fn remove(&mut self, key: &K) -> V

Clears value associated with key, and returns old value.

pub fn contains(&self, key: &K) -> bool

Returns true if there is a non-empty encoded value associated with the key.

Trait Implementations

impl<M, K: Default, V: Default> Default for ManagedMapEncoded<M, K, V>

where M: ManagedTypeApi + Default,

fn default() -> ManagedMapEncoded<M, K, V>

Returns the “default value” for a type.