before_transfer

Extendable function that allows the developer to add more functionality to the transfer function, before the transfer happens.

This allows, for example, to add fees on transfer or check that any given condition is present before the transfer can be completed.

If this function throws an exception, the assets will not be transferred.

Throws if any extension of this function throws.

Parameters

• from — the account that started the transfer
• to — the account that should receive the transfer
• asset — the asset that should be sent
• amount — the amount to transfer