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f4555c80fe
Reverts 259 files that carried unrelated upstream changes through the phase-6 merge: enum class removals (cppcoreguidelines-use-enum-class), scoped_lock→lock_guard conversions (modernize-use-scoped-lock), nodestore Backend API changes (void const* key), .clang-tidy config, test infrastructure deletions, and miscellaneous develop changes. These changes belong on develop, not in the telemetry PR chain. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Basics
Utility functions and classes.
The module xrpl/basics should contain no dependencies on other modules.
Choosing an xrpld container.
-
std::vector- For ordered containers with most insertions or erases at the end.
-
std::deque- For ordered containers with most insertions or erases at the start or end.
-
std::list- For ordered containers with inserts and erases to the middle.
- For containers with iterators stable over insert and erase.
- Generally slower and bigger than
std::vectororstd::dequeexcept for those cases.
-
std::set- For sorted containers.
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xrpl::hash_set- Where inserts and contains need to be O(1).
- For "small" sets,
std::setmight be faster and smaller.
-
xrpl::hardened_hash_set- For data sets where the key could be manipulated by an attacker in an attempt to mount an algorithmic complexity attack: see http://en.wikipedia.org/wiki/Algorithmic_complexity_attack
The following container is deprecated
std::unordered_set- Use
xrpl::hash_setinstead, which uses a better hashing algorithm. - Or use
xrpl::hardened_hash_setto prevent algorithmic complexity attacks.