When the Index type of a Range is Comparable, we can reject invalid
ranges at their formation.
It might be worth injecting some checkability concept into ForwardIndex
so that even in generic contexts where Comparability is unknown, we can
do this same check in the Range constructor.
Also, remove pattern matching support for Ranges of RandomAccessIndex,
as that is covered by Interval.
Fixes <rdar://problem/16254937> (#Seed 4: Ranges with negative strides
are broken) to the extent possible (it's still possible to form an
invalid Range of indices that are not Comparable)
Fixes <rdar://problem/17164391> (Swift: Using ranges in for in for
counting down, causes the loop to go inifinely)
Fixes <rdar://problem/17580871> (Swift: Closed range with negative
endpoint excludes that endpoint)
Swift SVN r19903
This allows 0.0..<10.3 and 0.1...4.4 to work properly in pattern
matching.
Fixes <rdar://problem/12016900> (#Seed 4: add a "contains" method to the
range types) by making "contains" available on Interval
Addresses <rdar://problem/16254937> (#Seed 4: Ranges with negative
strides are broken) by making the formation of an invalid Interval a
runtime error.
Fixes <rdar://problem/16304317> (Range<T> has limited awesomeness: it is
restricted to types that conform to ForwardIndex)
Fixes <rdar://problem/16736924> (#Seed 4: Enable range inclusion pattern
matching for all types that conform to Equatable and Comparable)
Addresses <rdar://problem/16846325> (#Seed 4: Introduce index range) by
distinguishing Range (which operates on indices) from Interval
Fixes <rdar://problem/17051263> (Pattern-matching a Double range with an
infinite endpoint triggers an assertion failure)
Fixes <rdar://problem/17051271> (#Seed 4: Pattern-matching Double ranges
excludes fractional values)
Addresses <rdar://problem/17171420> (Separate types for closed and
half-open ranges)
Swift SVN r19900
Mechanically add "Type" to the end of any protocol names that don't end
in "Type," "ible," or "able." Also, drop "Type" from the end of any
associated type names, except for those of the *LiteralConvertible
protocols.
There are obvious improvements to make in some of these names, which can
be handled with separate commits.
Fixes <rdar://problem/17165920> Protocols `Integer` etc should get
uglier names.
Swift SVN r19883
That functionality is now covered by the stride() functions for
Range<T:RandomAccessIndex>, and probably shouldn't be used for ranges of
lesser Index protocols anyway.
Swift SVN r19803
Sliceable is a totally non-critical protocol and Range slicing wasn't
even being tested. Along with r19771, fixes <rdar://problem/16363898>
Swift SVN r19775
This horrible hack prevents the user from indexing Range<I>, for all
integer types I, outside of a generic context. This seems to be the
best we can do to prevent confusion given the current language.
Addresses <rdar://problem/16363898>
Unfortunately, I can't make this work for slicing ranges yet.
Swift SVN r19771
Keep calm: remember that the standard library has many more public exports
than the average target, and that this contains ALL of them at once.
I also deliberately tried to tag nearly every top-level decl, even if that
was just to explicitly mark things @internal, to make sure I didn't miss
something.
This does export more than we might want to, mostly for protocol conformance
reasons, along with our simple-but-limiting typealias rule. I tried to also
mark things private where possible, but it's really going to be up to the
standard library owners to get this right. This is also only validated
against top-level access control; I haven't fully tested against member-level
access control yet, and none of our semantic restrictions are in place.
Along the way I also noticed bits of stdlib cruft; to keep this patch
understandable, I didn't change any of them.
Swift SVN r19145
This is motivated by <rdar://problem/17051606>.
This ends up renaming variables as well, which seems right for
consistency since we use "predicate" as variable name.
Swift SVN r19135
rdar://17380298 to track removing .. entirely for GM.
This finishes <rdar://problem/17203527> Swift range operators too easy to mis-type: change .. to ..<
Swift SVN r19004
