mirror of
https://github.com/XRPLF/rippled.git
synced 2026-06-07 10:47:05 +00:00
311719daeb
Three invariant checks used = instead of |= to accumulate their boolean flag across multiple visited entries. A later "good" entry could overwrite a violation detected by an earlier "bad" entry. Gate the corrected |= behavior behind fixInvariantOverwrite to preserve pre-amendment consensus. Each affected class tracks both the fixed (|=) and legacy (=) values; finalize picks which to use based on the amendment. Affected invariants: - NoZeroEscrow (bad_ for MPT locked vs outstanding) - NoXRPTrustLines (xrpTrustLine_) - NoDeepFreezeTrustLinesWithoutFreeze (deepFreezeWithoutFreeze_)
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 therippledcodebase.- 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.