2001-02-01 MK 2.4.3 Bug-fix release, mostly
As the title says... Python include path now upgraded to python2.2 (was 2.1).
2001-01-31 Cross-platform serialization, Tcl
There was a bug with serializing a datafile (SaveTo) when it was created on a platform with reverse endian-ness. Fixed so serialized data also flags reversed byte order. Tweaks to fix const changes in the latest Tcl cvs branch. Fixed a recently-introduced UTF8 path bug in mk4tcl.cpp.
2001-12-21 Optimized GetAs
Now that GetAs is used so much more, optimize the common case where a description does not require restructuring. Can lead to order-of magnitude speed improvement in cases where a storage contains many views.
2001-12-20 Fixed bug in Locate, comparison issue
Testing for the Mk4py changes uncovered a serious bug in
c4_View::Locate, causing it to sometimes return zero, even
if there are matching rows (thanks, Gordon).
But a very fundamental weakness also showed up, being that
row comparisons (and that includes the C++ operators) have
the confusing property of not being symmetric in all cases.
The problem occurs when left- and right-hand sides do not
contain the same (number of) properties. In that case, the
*left-hand* row participating in the comparison determines
which properties take part in a comparison.
In the case of Locate, this caused improper comparisons.
And it is very easy to get bitten by this, such as here:
c4_RowRef key = ...;
int n = view.Search(key);
bool match = n >= 0 && view[n] == key;
The above code is *wrong*. The last line needs to be:
bool match = n >= 0 && key == view[n];
This is very clearly a design mistake. Comparisons should
have been *either* implemented *or* named differently.
A new "m04" test has been added to the regression suite.2001-12-19 Changes to mk4py by Gordon McMillan
Several changes and cleanups. Mk4py now has logic to track different view categories, e.g. to make sure a R/O view is not being written to. This should greatly reduce the number of silently ignored incorrect calls, as well as crashes, and will produce appropriate error messages instead.
2001-12-18 Cleanup
Cleaned up source comments and got rid of yet more warnings.
2001-12-14 Fixed yet another case of crash-on-exit
The new Unmapped() code of 2.4.2 forgot one case of cleaning up, which has now been fixed (in c4_FormatB::Commit).
2001-12-12 MK 2.4.2 Better portability, hashing improved