<https://github.com/apple/swift-corelibs-foundation/blob/5f8656628c79bf4df3980efbf45dfb3eebd35766/Foundation/NSScanner.swift#L485-L487>
/// Revised API for avoiding usage of AutoreleasingUnsafeMutablePointer
and better Optional usage.
/// - Experiment: This is a draft API currently under consideration for
official import into Foundation as a suitable alternative
/// - Note: Since this API is under consideration it may be either
removed or revised in the near future
extension Scanner {
public func scanInt() -> Int32?
public func scanInteger() -> Int?
public func scanLongLong() -> Int64?
public func scanUnsignedLongLong() -> UInt64?
public func scanFloat() -> Float?
public func scanDouble() -> Double?
public func scanHexInt() -> UInt32?
public func scanHexLongLong() -> UInt64?
public func scanHexFloat() -> Float?
public func scanHexDouble() -> Double?
public func scanString(string searchString: String) -> String?
public func scanCharactersFromSet(_ set: CharacterSet) -> String?
public func scanUpToString(_ string: String) -> String?
public func scanUpToCharactersFromSet(_ set: CharacterSet) ->
String?
}
Foundation issues should be discussed on the swift-corelibs-dev list.
-- Ben
> On 30 Nov 2016, at 10:10, Oliver Drobnik via swift-evolution
> <[email protected]> wrote:
>
> Working on a function for Foundation’s Scanner I stumbled on this LLVM crash:
> https://bugs.swift.org/browse/SR-3295 <https://bugs.swift.org/browse/SR-3295>
>
> This got me thinking about a workaround and I would like to prose this:
>
> When importing Foundation into Swift 3, all
>
> AutoreleasingUnsafeMutablePointer<T?>?
>
> should instead be exposed as simple:
>
> inout T?
>
> e.g.
>
> open func scanString(_ string: String, into result:
> AutoreleasingUnsafeMutablePointer<NSString?>?) -> Bool
>
> would become
>
> open func scanString(_ string: String, into result: inout String?) -> Bool
>
>
> The call would stay exactly the same for normal use cases where you specify a
> receiving variable:
>
> var string: String?
> scanString("=", into: &string)
>
> because inout parameters require a &
>
>
> for the use case where you don’t require a receiving parameter, a second
> method without result parameter would be generated:
>
> open func scanString(_ string: String) -> Bool
>
> This is necessary because you cannot specify nil or an immutable value for an
> inout parameter.
>
>
> A fixit/migration would change calls to
>
> scanString(“foo", into result: nil)
>
> into
>
> scanString(“foo")
>
>
> The normal call with receiving variable would stay the same. But the case
> without return would become more concise.
>
> What do you think?
>
> kind regards
> Oliver Drobnik
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