This allows UnicodeScalars to be constructed from an integer, rather
then from a string. Not only this avoids an unnecessary memory
allocation (!) when creating a UnicodeScalar, this also allows the
compiler to statically check that the string contains a single scalar
value (in the same way the compiler checks that Character contains only
a single extended grapheme cluster).
rdar://17966622
Swift SVN r21198
algorithm
The implementation uses a specialized trie that has not been tuned to the table
data. I tried guessing parameter values that should work well, but did not do
any performance measurements.
There is no efficient way to initialize arrays with static data in Swift. The
required tables are being generated as C++ code in the runtime library.
rdar://16013860
Swift SVN r19340
This is only for the frontend, not for stdlib. The implementation is very
slow, optimizing it is the next step.
rdar://16755123 rdar://16013860
Swift SVN r18928
double-quoted string literals that contain a single extended grapheme cluster
SEGCL by default infer type String, but you can ask to infer Character
for them.
Single quoted literals continue to infer Character.
Actual extended grapheme cluster segmentation is not implemented yet,
<rdar://problem/16755123> Implement extended grapheme cluster
segmentation in libSwiftBasic
This is part of
<rdar://problem/16363872> Remove single quoted characters
Swift SVN r17034
