[swift-corelibs-dev] CChar vs Int8

[Luke Howard]

OK, I filed [SR-466] as a compiler issue. If the behaviour changes and that flows through to Darwin Foundation, we can update the open source one...

— Luke

> On 5 Jan 2016, at 8:21 AM, Philippe Hausler <phausler at apple.com> wrote:
> 
> No C strings import as UnsafePointer<CChar> for some reason; they all import as Int8
> 
> e.g.
> public func pthread_setname_np(_: UnsafePointer<Int8>) -> Int32
> 
> 
>> On Jan 4, 2016, at 1:20 PM, Tony Parker via swift-corelibs-dev <swift-corelibs-dev at swift.org <mailto:swift-corelibs-dev at swift.org>> wrote:
>> 
>> Hi Luke,
>> 
>>> On Jan 2, 2016, at 8:28 PM, Luke Howard via swift-corelibs-dev <swift-corelibs-dev at swift.org <mailto:swift-corelibs-dev at swift.org>> wrote:
>>> 
>>> Many Foundation APIs use Int8 instead of CChar when representing C strings, e.g.:
>>> var UTF8String: UnsafePointer <https://developer.apple.com/library/mac/documentation/Swift/Reference/Swift_UnsafePointer_Structure/index.html#//apple_ref/swift/struct/s:VSs13UnsafePointer><Int8 <https://developer.apple.com/library/mac/documentation/Swift/Reference/Swift_Int8_Structure/index.html#//apple_ref/swift/struct/s:VSs4Int8>> { get }
>>> I don’t know if/when Swift will be ported to a platform where the character type is unsigned but perhaps it would be good to update these to take CChar instead?
>>> 
>>> — Luke
>>> 
>> 
>> I’m not really sure why it’s imported to Swift as an unsafe pointer to Int8 anyway. The Objective-C code uses char:
>> 
>> @property (nullable, readonly) __strong const char *UTF8String NS_RETURNS_INNER_POINTER;	// Convenience to return null-terminated UTF8 representation
>> 
>> - (nullable instancetype)initWithUTF8String:(const char *)nullTerminatedCString;
>> 
>> - Tony
>> 
>> 
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> 

--
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