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Module `deepbook::custodian`

crates/sui-framework/docs/deepbook/custodian.md

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<pre><code><b>use</b> <a href="../std/address.md#std_address">std::address</a>; <b>use</b> <a href="../std/ascii.md#std_ascii">std::ascii</a>; <b>use</b> <a href="../std/bcs.md#std_bcs">std::bcs</a>; <b>use</b> <a href="../std/internal.md#std_internal">std::internal</a>; <b>use</b> <a href="../std/option.md#std_option">std::option</a>; <b>use</b> <a href="../std/string.md#std_string">std::string</a>; <b>use</b> <a href="../std/type_name.md#std_type_name">std::type_name</a>; <b>use</b> <a href="../std/u128.md#std_u128">std::u128</a>; <b>use</b> <a href="../std/vector.md#std_vector">std::vector</a>; <b>use</b> <a href="../sui/accumulator.md#sui_accumulator">sui::accumulator</a>; <b>use</b> <a href="../sui/accumulator_settlement.md#sui_accumulator_settlement">sui::accumulator_settlement</a>; <b>use</b> <a href="../sui/address.md#sui_address">sui::address</a>; <b>use</b> <a href="../sui/bag.md#sui_bag">sui::bag</a>; <b>use</b> <a href="../sui/balance.md#sui_balance">sui::balance</a>; <b>use</b> <a href="../sui/bcs.md#sui_bcs">sui::bcs</a>; <b>use</b> <a href="../sui/coin.md#sui_coin">sui::coin</a>; <b>use</b> <a href="../sui/config.md#sui_config">sui::config</a>; <b>use</b> <a href="../sui/deny_list.md#sui_deny_list">sui::deny_list</a>; <b>use</b> <a href="../sui/dynamic_field.md#sui_dynamic_field">sui::dynamic_field</a>; <b>use</b> <a href="../sui/dynamic_object_field.md#sui_dynamic_object_field">sui::dynamic_object_field</a>; <b>use</b> <a href="../sui/event.md#sui_event">sui::event</a>; <b>use</b> <a href="../sui/funds_accumulator.md#sui_funds_accumulator">sui::funds_accumulator</a>; <b>use</b> <a href="../sui/hash.md#sui_hash">sui::hash</a>; <b>use</b> <a href="../sui/hex.md#sui_hex">sui::hex</a>; <b>use</b> <a href="../sui/object.md#sui_object">sui::object</a>; <b>use</b> <a href="../sui/party.md#sui_party">sui::party</a>; <b>use</b> <a href="../sui/protocol_config.md#sui_protocol_config">sui::protocol_config</a>; <b>use</b> <a href="../sui/table.md#sui_table">sui::table</a>; <b>use</b> <a href="../sui/transfer.md#sui_transfer">sui::transfer</a>; <b>use</b> <a href="../sui/tx_context.md#sui_tx_context">sui::tx_context</a>; <b>use</b> <a href="../sui/types.md#sui_types">sui::types</a>; <b>use</b> <a href="../sui/url.md#sui_url">sui::url</a>; <b>use</b> <a href="../sui/vec_map.md#sui_vec_map">sui::vec_map</a>; <b>use</b> <a href="../sui/vec_set.md#sui_vec_set">sui::vec_set</a>; </code></pre>

<a name="deepbook_custodian_Account"></a>

Struct Account

<pre><code><b>public</b> <b>struct</b> <a href="../deepbook/custodian.md#deepbook_custodian_Account">Account</a>&lt;<b>phantom</b> T&gt; <b>has</b> store </code></pre> <details> <summary>Fields</summary> <dl> <dt> <code>available_balance: <a href="../sui/balance.md#sui_balance_Balance">sui::balance::Balance</a>&lt;T&gt;</code> </dt> <dd> </dd> <dt> <code>locked_balance: <a href="../sui/balance.md#sui_balance_Balance">sui::balance::Balance</a>&lt;T&gt;</code> </dt> <dd> </dd> </dl> </details>

<a name="deepbook_custodian_AccountCap"></a>

Struct AccountCap

<pre><code><b>public</b> <b>struct</b> <a href="../deepbook/custodian.md#deepbook_custodian_AccountCap">AccountCap</a> <b>has</b> key, store </code></pre> <details> <summary>Fields</summary> <dl> <dt> <code>id: <a href="../sui/object.md#sui_object_UID">sui::object::UID</a></code> </dt> <dd> </dd> </dl> </details>

<a name="deepbook_custodian_Custodian"></a>

Struct Custodian

<pre><code><b>public</b> <b>struct</b> <a href="../deepbook/custodian.md#deepbook_custodian_Custodian">Custodian</a>&lt;<b>phantom</b> T&gt; <b>has</b> key, store </code></pre> <details> <summary>Fields</summary> <dl> <dt> <code>id: <a href="../sui/object.md#sui_object_UID">sui::object::UID</a></code> </dt> <dd> </dd> <dt> <code>account_balances: <a href="../sui/table.md#sui_table_Table">sui::table::Table</a>&lt;<a href="../sui/object.md#sui_object_ID">sui::object::ID</a>, <a href="../deepbook/custodian.md#deepbook_custodian_Account">deepbook::custodian::Account</a>&lt;T&gt;&gt;</code> </dt> <dd> Map from an AccountCap object ID to an Account object </dd> </dl> </details>

<a name="deepbook_custodian_mint_account_cap"></a>

Function mint_account_cap

Create an <code><a href="../deepbook/custodian.md#deepbook_custodian_AccountCap">AccountCap</a></code> that can be used across all DeepBook pool

<pre><code><b>public</b> <b>fun</b> <a href="../deepbook/custodian.md#deepbook_custodian_mint_account_cap">mint_account_cap</a>(_ctx: &<b>mut</b> <a href="../sui/tx_context.md#sui_tx_context_TxContext">sui::tx_context::TxContext</a>): <a href="../deepbook/custodian.md#deepbook_custodian_AccountCap">deepbook::custodian::AccountCap</a> </code></pre> <details> <summary>Implementation</summary> <pre><code><b>public</b> <b>fun</b> <a href="../deepbook/custodian.md#deepbook_custodian_mint_account_cap">mint_account_cap</a>(_ctx: &<b>mut</b> TxContext): <a href="../deepbook/custodian.md#deepbook_custodian_AccountCap">AccountCap</a> { <b>abort</b> 1337 } </code></pre> </details>

<a name="deepbook_custodian_account_balance"></a>

Function account_balance

<pre><code><b>public</b>(package) <b>fun</b> <a href="../deepbook/custodian.md#deepbook_custodian_account_balance">account_balance</a>&lt;Asset&gt;(<a href="../deepbook/custodian.md#deepbook_custodian">custodian</a>: &<a href="../deepbook/custodian.md#deepbook_custodian_Custodian">deepbook::custodian::Custodian</a>&lt;Asset&gt;, user: <a href="../sui/object.md#sui_object_ID">sui::object::ID</a>): (u64, u64) </code></pre> <details> <summary>Implementation</summary> <pre><code><b>public</b>(package) <b>fun</b> <a href="../deepbook/custodian.md#deepbook_custodian_account_balance">account_balance</a>&lt;Asset&gt;( <a href="../deepbook/custodian.md#deepbook_custodian">custodian</a>: &<a href="../deepbook/custodian.md#deepbook_custodian_Custodian">Custodian</a>&lt;Asset&gt;, user: ID ): (u64, u64) { // <b>if</b> <a href="../deepbook/custodian.md#deepbook_custodian">custodian</a> account is not created yet, directly <b>return</b> (0, 0) rather than <b>abort</b> <b>if</b> (!table::contains(&<a href="../deepbook/custodian.md#deepbook_custodian">custodian</a>.account_balances, user)) { <b>return</b> (0, 0) }; <b>let</b> account_balances = table::borrow(&<a href="../deepbook/custodian.md#deepbook_custodian">custodian</a>.account_balances, user); <b>let</b> avail_balance = balance::value(&account_balances.available_balance); <b>let</b> locked_balance = balance::value(&account_balances.locked_balance); (avail_balance, locked_balance) } </code></pre> </details>

<a name="deepbook_custodian_new"></a>

Function new

<pre><code><b>public</b>(package) <b>fun</b> <a href="../deepbook/custodian.md#deepbook_custodian_new">new</a>&lt;T&gt;(ctx: &<b>mut</b> <a href="../sui/tx_context.md#sui_tx_context_TxContext">sui::tx_context::TxContext</a>): <a href="../deepbook/custodian.md#deepbook_custodian_Custodian">deepbook::custodian::Custodian</a>&lt;T&gt; </code></pre> <details> <summary>Implementation</summary> <pre><code><b>public</b>(package) <b>fun</b> <a href="../deepbook/custodian.md#deepbook_custodian_new">new</a>&lt;T&gt;(ctx: &<b>mut</b> TxContext): <a href="../deepbook/custodian.md#deepbook_custodian_Custodian">Custodian</a>&lt;T&gt; { <a href="../deepbook/custodian.md#deepbook_custodian_Custodian">Custodian</a>&lt;T&gt; { id: object::new(ctx), account_balances: table::new(ctx), } } </code></pre> </details>

<a name="deepbook_custodian_withdraw_asset"></a>

Function withdraw_asset

<pre><code><b>public</b>(package) <b>fun</b> <a href="../deepbook/custodian.md#deepbook_custodian_withdraw_asset">withdraw_asset</a>&lt;Asset&gt;(<a href="../deepbook/custodian.md#deepbook_custodian">custodian</a>: &<b>mut</b> <a href="../deepbook/custodian.md#deepbook_custodian_Custodian">deepbook::custodian::Custodian</a>&lt;Asset&gt;, quantity: u64, account_cap: &<a href="../deepbook/custodian.md#deepbook_custodian_AccountCap">deepbook::custodian::AccountCap</a>, ctx: &<b>mut</b> <a href="../sui/tx_context.md#sui_tx_context_TxContext">sui::tx_context::TxContext</a>): <a href="../sui/coin.md#sui_coin_Coin">sui::coin::Coin</a>&lt;Asset&gt; </code></pre> <details> <summary>Implementation</summary> <pre><code><b>public</b>(package) <b>fun</b> <a href="../deepbook/custodian.md#deepbook_custodian_withdraw_asset">withdraw_asset</a>&lt;Asset&gt;( <a href="../deepbook/custodian.md#deepbook_custodian">custodian</a>: &<b>mut</b> <a href="../deepbook/custodian.md#deepbook_custodian_Custodian">Custodian</a>&lt;Asset&gt;, quantity: u64, account_cap: &<a href="../deepbook/custodian.md#deepbook_custodian_AccountCap">AccountCap</a>, ctx: &<b>mut</b> TxContext ): Coin&lt;Asset&gt; { coin::from_balance(<a href="../deepbook/custodian.md#deepbook_custodian_decrease_user_available_balance">decrease_user_available_balance</a>&lt;Asset&gt;(<a href="../deepbook/custodian.md#deepbook_custodian">custodian</a>, account_cap, quantity), ctx) } </code></pre> </details>

<a name="deepbook_custodian_increase_user_available_balance"></a>

Function increase_user_available_balance

<pre><code><b>public</b>(package) <b>fun</b> <a href="../deepbook/custodian.md#deepbook_custodian_increase_user_available_balance">increase_user_available_balance</a>&lt;T&gt;(<a href="../deepbook/custodian.md#deepbook_custodian">custodian</a>: &<b>mut</b> <a href="../deepbook/custodian.md#deepbook_custodian_Custodian">deepbook::custodian::Custodian</a>&lt;T&gt;, user: <a href="../sui/object.md#sui_object_ID">sui::object::ID</a>, quantity: <a href="../sui/balance.md#sui_balance_Balance">sui::balance::Balance</a>&lt;T&gt;) </code></pre> <details> <summary>Implementation</summary> <pre><code><b>public</b>(package) <b>fun</b> <a href="../deepbook/custodian.md#deepbook_custodian_increase_user_available_balance">increase_user_available_balance</a>&lt;T&gt;( <a href="../deepbook/custodian.md#deepbook_custodian">custodian</a>: &<b>mut</b> <a href="../deepbook/custodian.md#deepbook_custodian_Custodian">Custodian</a>&lt;T&gt;, user: ID, quantity: Balance&lt;T&gt;, ) { <b>let</b> account = <a href="../deepbook/custodian.md#deepbook_custodian_borrow_mut_account_balance">borrow_mut_account_balance</a>&lt;T&gt;(<a href="../deepbook/custodian.md#deepbook_custodian">custodian</a>, user); balance::join(&<b>mut</b> account.available_balance, quantity); } </code></pre> </details>

<a name="deepbook_custodian_decrease_user_available_balance"></a>

Function decrease_user_available_balance

<pre><code><b>public</b>(package) <b>fun</b> <a href="../deepbook/custodian.md#deepbook_custodian_decrease_user_available_balance">decrease_user_available_balance</a>&lt;T&gt;(<a href="../deepbook/custodian.md#deepbook_custodian">custodian</a>: &<b>mut</b> <a href="../deepbook/custodian.md#deepbook_custodian_Custodian">deepbook::custodian::Custodian</a>&lt;T&gt;, account_cap: &<a href="../deepbook/custodian.md#deepbook_custodian_AccountCap">deepbook::custodian::AccountCap</a>, quantity: u64): <a href="../sui/balance.md#sui_balance_Balance">sui::balance::Balance</a>&lt;T&gt; </code></pre> <details> <summary>Implementation</summary> <pre><code><b>public</b>(package) <b>fun</b> <a href="../deepbook/custodian.md#deepbook_custodian_decrease_user_available_balance">decrease_user_available_balance</a>&lt;T&gt;( <a href="../deepbook/custodian.md#deepbook_custodian">custodian</a>: &<b>mut</b> <a href="../deepbook/custodian.md#deepbook_custodian_Custodian">Custodian</a>&lt;T&gt;, account_cap: &<a href="../deepbook/custodian.md#deepbook_custodian_AccountCap">AccountCap</a>, quantity: u64, ): Balance&lt;T&gt; { <b>let</b> account = <a href="../deepbook/custodian.md#deepbook_custodian_borrow_mut_account_balance">borrow_mut_account_balance</a>&lt;T&gt;(<a href="../deepbook/custodian.md#deepbook_custodian">custodian</a>, object::uid_to_inner(&account_cap.id)); balance::split(&<b>mut</b> account.available_balance, quantity) } </code></pre> </details>

<a name="deepbook_custodian_increase_user_locked_balance"></a>

Function increase_user_locked_balance

<pre><code><b>public</b>(package) <b>fun</b> <a href="../deepbook/custodian.md#deepbook_custodian_increase_user_locked_balance">increase_user_locked_balance</a>&lt;T&gt;(<a href="../deepbook/custodian.md#deepbook_custodian">custodian</a>: &<b>mut</b> <a href="../deepbook/custodian.md#deepbook_custodian_Custodian">deepbook::custodian::Custodian</a>&lt;T&gt;, account_cap: &<a href="../deepbook/custodian.md#deepbook_custodian_AccountCap">deepbook::custodian::AccountCap</a>, quantity: <a href="../sui/balance.md#sui_balance_Balance">sui::balance::Balance</a>&lt;T&gt;) </code></pre> <details> <summary>Implementation</summary> <pre><code><b>public</b>(package) <b>fun</b> <a href="../deepbook/custodian.md#deepbook_custodian_increase_user_locked_balance">increase_user_locked_balance</a>&lt;T&gt;( <a href="../deepbook/custodian.md#deepbook_custodian">custodian</a>: &<b>mut</b> <a href="../deepbook/custodian.md#deepbook_custodian_Custodian">Custodian</a>&lt;T&gt;, account_cap: &<a href="../deepbook/custodian.md#deepbook_custodian_AccountCap">AccountCap</a>, quantity: Balance&lt;T&gt;, ) { <b>let</b> account = <a href="../deepbook/custodian.md#deepbook_custodian_borrow_mut_account_balance">borrow_mut_account_balance</a>&lt;T&gt;(<a href="../deepbook/custodian.md#deepbook_custodian">custodian</a>, object::uid_to_inner(&account_cap.id)); balance::join(&<b>mut</b> account.locked_balance, quantity); } </code></pre> </details>

<a name="deepbook_custodian_decrease_user_locked_balance"></a>

Function decrease_user_locked_balance

<pre><code><b>public</b>(package) <b>fun</b> <a href="../deepbook/custodian.md#deepbook_custodian_decrease_user_locked_balance">decrease_user_locked_balance</a>&lt;T&gt;(<a href="../deepbook/custodian.md#deepbook_custodian">custodian</a>: &<b>mut</b> <a href="../deepbook/custodian.md#deepbook_custodian_Custodian">deepbook::custodian::Custodian</a>&lt;T&gt;, user: <a href="../sui/object.md#sui_object_ID">sui::object::ID</a>, quantity: u64): <a href="../sui/balance.md#sui_balance_Balance">sui::balance::Balance</a>&lt;T&gt; </code></pre> <details> <summary>Implementation</summary> <pre><code><b>public</b>(package) <b>fun</b> <a href="../deepbook/custodian.md#deepbook_custodian_decrease_user_locked_balance">decrease_user_locked_balance</a>&lt;T&gt;( <a href="../deepbook/custodian.md#deepbook_custodian">custodian</a>: &<b>mut</b> <a href="../deepbook/custodian.md#deepbook_custodian_Custodian">Custodian</a>&lt;T&gt;, user: ID, quantity: u64, ): Balance&lt;T&gt; { <b>let</b> account = <a href="../deepbook/custodian.md#deepbook_custodian_borrow_mut_account_balance">borrow_mut_account_balance</a>&lt;T&gt;(<a href="../deepbook/custodian.md#deepbook_custodian">custodian</a>, user); split(&<b>mut</b> account.locked_balance, quantity) } </code></pre> </details>

<a name="deepbook_custodian_lock_balance"></a>

Function lock_balance

Move <code>quantity</code> from the unlocked balance of <code>user</code> to the locked balance of <code>user</code>

<pre><code><b>public</b>(package) <b>fun</b> <a href="../deepbook/custodian.md#deepbook_custodian_lock_balance">lock_balance</a>&lt;T&gt;(<a href="../deepbook/custodian.md#deepbook_custodian">custodian</a>: &<b>mut</b> <a href="../deepbook/custodian.md#deepbook_custodian_Custodian">deepbook::custodian::Custodian</a>&lt;T&gt;, account_cap: &<a href="../deepbook/custodian.md#deepbook_custodian_AccountCap">deepbook::custodian::AccountCap</a>, quantity: u64) </code></pre> <details> <summary>Implementation</summary> <pre><code><b>public</b>(package) <b>fun</b> <a href="../deepbook/custodian.md#deepbook_custodian_lock_balance">lock_balance</a>&lt;T&gt;( <a href="../deepbook/custodian.md#deepbook_custodian">custodian</a>: &<b>mut</b> <a href="../deepbook/custodian.md#deepbook_custodian_Custodian">Custodian</a>&lt;T&gt;, account_cap: &<a href="../deepbook/custodian.md#deepbook_custodian_AccountCap">AccountCap</a>, quantity: u64, ) { <b>let</b> to_lock = <a href="../deepbook/custodian.md#deepbook_custodian_decrease_user_available_balance">decrease_user_available_balance</a>(<a href="../deepbook/custodian.md#deepbook_custodian">custodian</a>, account_cap, quantity); <a href="../deepbook/custodian.md#deepbook_custodian_increase_user_locked_balance">increase_user_locked_balance</a>(<a href="../deepbook/custodian.md#deepbook_custodian">custodian</a>, account_cap, to_lock); } </code></pre> </details>

<a name="deepbook_custodian_unlock_balance"></a>

Function unlock_balance

Move <code>quantity</code> from the locked balance of <code>user</code> to the unlocked balance of <code>user</code>

<pre><code><b>public</b>(package) <b>fun</b> <a href="../deepbook/custodian.md#deepbook_custodian_unlock_balance">unlock_balance</a>&lt;T&gt;(<a href="../deepbook/custodian.md#deepbook_custodian">custodian</a>: &<b>mut</b> <a href="../deepbook/custodian.md#deepbook_custodian_Custodian">deepbook::custodian::Custodian</a>&lt;T&gt;, user: <a href="../sui/object.md#sui_object_ID">sui::object::ID</a>, quantity: u64) </code></pre> <details> <summary>Implementation</summary> <pre><code><b>public</b>(package) <b>fun</b> <a href="../deepbook/custodian.md#deepbook_custodian_unlock_balance">unlock_balance</a>&lt;T&gt;( <a href="../deepbook/custodian.md#deepbook_custodian">custodian</a>: &<b>mut</b> <a href="../deepbook/custodian.md#deepbook_custodian_Custodian">Custodian</a>&lt;T&gt;, user: ID, quantity: u64, ) { <b>let</b> locked_balance = <a href="../deepbook/custodian.md#deepbook_custodian_decrease_user_locked_balance">decrease_user_locked_balance</a>&lt;T&gt;(<a href="../deepbook/custodian.md#deepbook_custodian">custodian</a>, user, quantity); <a href="../deepbook/custodian.md#deepbook_custodian_increase_user_available_balance">increase_user_available_balance</a>&lt;T&gt;(<a href="../deepbook/custodian.md#deepbook_custodian">custodian</a>, user, locked_balance) } </code></pre> </details>

<a name="deepbook_custodian_account_available_balance"></a>

Function account_available_balance

<pre><code><b>public</b>(package) <b>fun</b> <a href="../deepbook/custodian.md#deepbook_custodian_account_available_balance">account_available_balance</a>&lt;T&gt;(<a href="../deepbook/custodian.md#deepbook_custodian">custodian</a>: &<a href="../deepbook/custodian.md#deepbook_custodian_Custodian">deepbook::custodian::Custodian</a>&lt;T&gt;, user: <a href="../sui/object.md#sui_object_ID">sui::object::ID</a>): u64 </code></pre> <details> <summary>Implementation</summary> <pre><code><b>public</b>(package) <b>fun</b> <a href="../deepbook/custodian.md#deepbook_custodian_account_available_balance">account_available_balance</a>&lt;T&gt;( <a href="../deepbook/custodian.md#deepbook_custodian">custodian</a>: &<a href="../deepbook/custodian.md#deepbook_custodian_Custodian">Custodian</a>&lt;T&gt;, user: ID, ): u64 { balance::value(&table::borrow(&<a href="../deepbook/custodian.md#deepbook_custodian">custodian</a>.account_balances, user).available_balance) } </code></pre> </details>

<a name="deepbook_custodian_account_locked_balance"></a>

Function account_locked_balance

<pre><code><b>public</b>(package) <b>fun</b> <a href="../deepbook/custodian.md#deepbook_custodian_account_locked_balance">account_locked_balance</a>&lt;T&gt;(<a href="../deepbook/custodian.md#deepbook_custodian">custodian</a>: &<a href="../deepbook/custodian.md#deepbook_custodian_Custodian">deepbook::custodian::Custodian</a>&lt;T&gt;, user: <a href="../sui/object.md#sui_object_ID">sui::object::ID</a>): u64 </code></pre> <details> <summary>Implementation</summary> <pre><code><b>public</b>(package) <b>fun</b> <a href="../deepbook/custodian.md#deepbook_custodian_account_locked_balance">account_locked_balance</a>&lt;T&gt;( <a href="../deepbook/custodian.md#deepbook_custodian">custodian</a>: &<a href="../deepbook/custodian.md#deepbook_custodian_Custodian">Custodian</a>&lt;T&gt;, user: ID, ): u64 { balance::value(&table::borrow(&<a href="../deepbook/custodian.md#deepbook_custodian">custodian</a>.account_balances, user).locked_balance) } </code></pre> </details>

<a name="deepbook_custodian_borrow_mut_account_balance"></a>

Function borrow_mut_account_balance

<pre><code><b>fun</b> <a href="../deepbook/custodian.md#deepbook_custodian_borrow_mut_account_balance">borrow_mut_account_balance</a>&lt;T&gt;(<a href="../deepbook/custodian.md#deepbook_custodian">custodian</a>: &<b>mut</b> <a href="../deepbook/custodian.md#deepbook_custodian_Custodian">deepbook::custodian::Custodian</a>&lt;T&gt;, user: <a href="../sui/object.md#sui_object_ID">sui::object::ID</a>): &<b>mut</b> <a href="../deepbook/custodian.md#deepbook_custodian_Account">deepbook::custodian::Account</a>&lt;T&gt; </code></pre> <details> <summary>Implementation</summary> <pre><code><b>fun</b> <a href="../deepbook/custodian.md#deepbook_custodian_borrow_mut_account_balance">borrow_mut_account_balance</a>&lt;T&gt;( <a href="../deepbook/custodian.md#deepbook_custodian">custodian</a>: &<b>mut</b> <a href="../deepbook/custodian.md#deepbook_custodian_Custodian">Custodian</a>&lt;T&gt;, user: ID, ): &<b>mut</b> <a href="../deepbook/custodian.md#deepbook_custodian_Account">Account</a>&lt;T&gt; { <b>if</b> (!table::contains(&<a href="../deepbook/custodian.md#deepbook_custodian">custodian</a>.account_balances, user)) { table::add( &<b>mut</b> <a href="../deepbook/custodian.md#deepbook_custodian">custodian</a>.account_balances, user, <a href="../deepbook/custodian.md#deepbook_custodian_Account">Account</a> { available_balance: balance::zero(), locked_balance: balance::zero() } ); }; table::borrow_mut(&<b>mut</b> <a href="../deepbook/custodian.md#deepbook_custodian">custodian</a>.account_balances, user) } </code></pre> </details>