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fa6a96e6d8
CredentialCreate accepted any existing Subject, including Vault, LoanBroker, and AMM pseudo-accounts. A pseudo-account can't sign, so it can never accept or delete a credential issued to it; the unaccepted credential stays pinned in the pseudo-account's owner directory and blocks deletion of the owning object, locking it and its owner reserve indefinitely. Behind fixCleanup3_4_0: - CredentialCreate::preclaim rejects a pseudo-account Subject with tecPSEUDO_ACCOUNT. - VaultDelete and LoanBrokerDelete remove any credentials pinned to the pseudo-account before deleting it. - isOnlyLiquidityProvider ignores credential entries and deleteAMMAccount removes them, so an AMM pinned before the amendment can still be withdrawn and deleted. This clears objects pinned before the amendment and prevents new pins after it.
protocol
Classes and functions for handling data and values associated with the XRP Ledger protocol.
Serialized Objects
Objects transmitted over the network must be serialized into a canonical format. The prefix "ST" refers to classes that deal with the serialized format.
The term "Tx" or "tx" is an abbreviation for "Transaction", a commonly occurring object type.
Optional Fields
Our serialized fields have some "type magic" to make optional fields easier to read:
- The operation
x[sfFoo]means "return the value of 'Foo' if it exists, or the default value if it doesn't." - The operation
x[~sfFoo]means "return the value of 'Foo' if it exists, or nothing if it doesn't." This usage of the tilde/bitwise NOT operator is not standard outside of thexrpldcodebase.- As a consequence of this,
x[~sfFoo] = y[~sfFoo]assigns the value of Foo from y to x, including omitting Foo from x if it doesn't exist in y.
- As a consequence of this,
Typically, for things that are guaranteed to exist, you use
x[sfFoo] and avoid having to deal with a container that may
or may not hold a value. For things not guaranteed to exist,
you use x[~sfFoo] because you want such a container. It
avoids having to look something up twice, once just to see if
it exists and a second time to get/set its value.
(Real example)
The source of this "type magic" is in SField.h.