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Signed-off-by: JCW <a1q123456@users.noreply.github.com> # Conflicts: # include/xrpl/tx/InvariantCheck.h # include/xrpl/tx/transactors/Lending/LendingHelpers.h # src/libxrpl/tx/InvariantCheck.cpp # src/libxrpl/tx/transactors/Lending/LoanBrokerCoverWithdraw.cpp # src/test/app/Invariants_test.cpp
Basics
Utility functions and classes.
ripple/basic should contain no dependencies on other modules.
Choosing a rippled 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.
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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.
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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.