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Module sui::object_table

Similar to 

sui::table
, an 
ObjectTable<K, V>
is a map-like collection. But unlike 
sui::table
, the values bound to these dynamic fields must be objects themselves. This allows for the objects to still exist within in storage, which may be important for external tools. The difference is otherwise not observable from within Move.

use std::ascii;
use std::bcs;
use std::option;
use std::string;
use std::vector;
use sui::address;
use sui::dynamic_field;
use sui::dynamic_object_field;
use sui::hex;
use sui::object;
use sui::tx_context;

Struct ObjectTable​

public struct ObjectTable<phantom K: copy, drop, store, phantom V: key, store> has key, store
Click to open
Fields
id: sui::object::UID
the ID of this table
size: u64
the number of key-value pairs in the table

Constants​

const ETableNotEmpty: u64 = 0;

Function new​

Creates a new, empty table

public fun new<K: copy, drop, store, V: key, store>(ctx: &mut sui::tx_context::TxContext): sui::object_table::ObjectTable<K, V>
Click to open
Implementation
public fun new<K: copy + drop + store, V: key + store>(ctx: &mut TxContext): ObjectTable<K, V> {
    ObjectTable {
        id: object::new(ctx),
        size: 0,
    }
}

Function add​

Adds a key-value pair to the table 

table: &mut ObjectTable<K, V>
Aborts with 
sui::dynamic_field::EFieldAlreadyExists
if the table already has an entry with that key k: K.

public fun add<K: copy, drop, store, V: key, store>(table: &mut sui::object_table::ObjectTable<K, V>, k: K, v: V)
Click to open
Implementation
public fun add<K: copy + drop + store, V: key + store>(table: &mut ObjectTable<K, V>, k: K, v: V) {
    ofield::add(&mut table.id, k, v);
    table.size = table.size + 1;
}

Function borrow​

Immutable borrows the value associated with the key in the table 

table: &ObjectTable<K, V>
. Aborts with 
sui::dynamic_field::EFieldDoesNotExist
if the table does not have an entry with that key k: K.

public fun borrow<K: copy, drop, store, V: key, store>(table: &sui::object_table::ObjectTable<K, V>, k: K): &V
Click to open
Implementation
public fun borrow<K: copy + drop + store, V: key + store>(table: &ObjectTable<K, V>, k: K): &V {
    ofield::borrow(&table.id, k)
}

Function borrow_mut​

Mutably borrows the value associated with the key in the table 

table: &mut ObjectTable<K, V>
. Aborts with 
sui::dynamic_field::EFieldDoesNotExist
if the table does not have an entry with that key k: K.

public fun borrow_mut<K: copy, drop, store, V: key, store>(table: &mut sui::object_table::ObjectTable<K, V>, k: K): &mut V
Click to open
Implementation
public fun borrow_mut<K: copy + drop + store, V: key + store>(
    table: &mut ObjectTable<K, V>,
    k: K,
): &mut V {
    ofield::borrow_mut(&mut table.id, k)
}

Function remove​

Removes the key-value pair in the table 

table: &mut ObjectTable<K, V>
and returns the value. Aborts with 
sui::dynamic_field::EFieldDoesNotExist
if the table does not have an entry with that key k: K.

public fun remove<K: copy, drop, store, V: key, store>(table: &mut sui::object_table::ObjectTable<K, V>, k: K): V
Click to open
Implementation
public fun remove<K: copy + drop + store, V: key + store>(table: &mut ObjectTable<K, V>, k: K): V {
    let v = ofield::remove(&mut table.id, k);
    table.size = table.size - 1;
    v
}

Function contains​

Returns true if there is a value associated with the key k: K in table 

table: &ObjectTable<K, V>

public fun contains<K: copy, drop, store, V: key, store>(table: &sui::object_table::ObjectTable<K, V>, k: K): bool
Click to open
Implementation
public fun contains<K: copy + drop + store, V: key + store>(table: &ObjectTable<K, V>, k: K): bool {
    ofield::exists_<K>(&table.id, k)
}

Function length​

Returns the size of the table, the number of key-value pairs

public fun length<K: copy, drop, store, V: key, store>(table: &sui::object_table::ObjectTable<K, V>): u64
Click to open
Implementation
public fun length<K: copy + drop + store, V: key + store>(table: &ObjectTable<K, V>): u64 {
    table.size
}

Function is_empty​

Returns true if the table is empty (if 

length
returns 0)

public fun is_empty<K: copy, drop, store, V: key, store>(table: &sui::object_table::ObjectTable<K, V>): bool
Click to open
Implementation
public fun is_empty<K: copy + drop + store, V: key + store>(table: &ObjectTable<K, V>): bool {
    table.size == 0
}

Function destroy_empty​

Destroys an empty table Aborts with 

ETableNotEmpty
if the table still contains values

public fun destroy_empty<K: copy, drop, store, V: key, store>(table: sui::object_table::ObjectTable<K, V>)
Click to open
Implementation
public fun destroy_empty<K: copy + drop + store, V: key + store>(table: ObjectTable<K, V>) {
    let ObjectTable { id, size } = table;
    assert!(size == 0, ETableNotEmpty);
    id.delete()
}

Function value_id​

Returns the ID of the object associated with the key if the table has an entry with key k: K Returns none otherwise

public fun value_id<K: copy, drop, store, V: key, store>(table: &sui::object_table::ObjectTable<K, V>, k: K): std::option::Option<sui::object::ID>
Click to open
Implementation
public fun value_id<K: copy + drop + store, V: key + store>(
    table: &ObjectTable<K, V>,
    k: K,
): Option<ID> {
    ofield::id(&table.id, k)
}