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7085aa3d55
* Add canonical "scale" computation to Number - Requires a template for STAmount and Asset. - Update tests and computeMinScale from #6217 to use scale. - Convert a few other places to use "scale" correctly. * ValidVault tracks scale of original operands alongside deltas * Update src/xrpld/app/tx/detail/InvariantCheck.cpp Co-authored-by: Vito Tumas <5780819+Tapanito@users.noreply.github.com> * Change ValidVault::DeltaInfo::scale to an optional * Change computeMinScale to use a vector instead of an initializer_list * Fix compile errors --------- Co-authored-by: Vito Tumas <5780819+Tapanito@users.noreply.github.com>
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.