- make table power-of-two, but since it seems to give 1-2% performance
improvement, maybe forget it too.
- remove two-argument form of hashing classes and do the modulus direclty
within HashTable instead. This simplifies things a fair bit.
- migrate Hash<void*> from db/dlLibrary to primitives/hashes/Hash
- much better performance on empty tables (4-6x speedup), neutral
performance change on filled tables. Since tableSize_ is non-zero when
nElmts_ is, there is no modulus zero problem.
- OSspecific: chmod() -> chMod(), even although it's not used anywhere
- ListOps get subset() and inplaceSubset() templated on BoolListType
- added UList<bool>::operator[](..) const specialization.
Returns false (actually pTraits<bool>::zero) for out-of-range elements.
This lets us use List<bool> with lazy evaluation and no noticeable
change in performance.
- use rcIndex() and fcIndex() wherever possible.
Could check if branching or modulus is faster for fcIndex().
- UList and FixedList get 'const T* cdata() const' and 'T* data()' members.
Similar to the STL front() and std::string::data() methods, they return a
pointer to the first element without needing to write '&myList[0]', recast
begin() or violate const-ness.
- The capitalization is consistent with most other template classes, but
more importantly frees up xfer() for use as method name without needing
special treatment to avoid ambiguities.
It seems reasonable to have different names for transfer(...) and xfer()
methods, since the transfer is occuring in different directions.
The xfer() method can thus replace the recently introduced zero-parameter
transfer() methods.
Other name candidates (eg, yield, release, etc.) were deemed too abstract.
StaticHashTable:
- erase(iterator&) now actually alters the iterator and iterator++() handles
it properly
- clear() also sets count to zero
- operator=(const StaticHashTable&) doesn't crash after a previous transfer
- operator(), operator==() and operator!=() added
HashTable:
- operator=(const HashTable&) gets tableSize if required, eg, after a
previous transfer)
HashSet / Map
- add xfer<...> constructor for underlying HashTable
