before_crosschain_balance_change
@extendable function before_crosschain_balance_change(sender: account, recipient: account, asset: asset, amount: big_integer, will_change_sender: boolean, will_change_recipient: boolean)(source)
Extendable function that allows the developer to add more functionality to the update_balances_if_needed function, before the balance change is applied.
This allows, for example, to check that any condition is met before the balance change is applied. Or to modify the balance or amount before it is changed.
If this function throws, the balance change will not be applied.
Throws when any extension of this function throws.
Parameters
sender
the account that has transferred the tokens
recipient
the account that will receive the tokens
asset
the asset that was transferred
amount
the amount that was transferred
will_change_sender
whether the sender's balance will change
will_change_recipient
whether the recipient's balance will change