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* ximinez/number-round-maxrep-down: Revert "Rollback Number class changes; show the fix works without side effects" Rollback Number class changes; show the fix works without side effects Include rounding in failed unit tests Improve comment descriptions Rework subtraction rounding (again) for more accuracy build: Create single test binary xrpl_tests (7327) ci: [DEPENDABOT] bump actions/checkout from 6.0.2 to 6.0.3 (7414) ci: Refactor build-related nix / docker / workflows (7408) refactor: Construct Number::Guard from MantissaRange or relevant fields ci: Use multiple directories in dependabot config (7413) ci: Update clang-tidy to nix-based v22 (7412) clang-tidy: template param names, const correctness, braces
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.
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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.