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4c98b501a6
Along the way created bridging utilities for ObjectiveC functions that take "out" arguments and added an fmap for operating on Optionals Swift SVN r11123
28 lines
815 B
Swift
28 lines
815 B
Swift
/// \brief A means of accepting "out" parameters from Objective-C
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/// functions taking the parameters by pointer
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func withOutArgument<T, Result>(
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arg: @inout T,
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f: (UnsafePointer<T>)->Result
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) -> Result
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{
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return f(UnsafePointer<T>(Builtin.addressof(&arg)))
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}
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/// \brief A means of accepting @autorelease "out" parameters from
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/// Objective-C functions, which can be tricky because they are
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/// not handed to us at +1 like other objects.
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func withAutoReleasedOutArgument<T, Result>(
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arg: @inout T?,
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f: (UnsafePointer<T>)->Result
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) -> Result
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{
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var buffer: Builtin.RawPointer = Builtin.inttoptr_Int64(0.value)
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var address = UnsafePointer<T>(Builtin.addressof(&buffer))
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var result = f(address)
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arg = Int64(Builtin.ptrtoint_Int64(buffer)) == 0
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? .None : .Some(address.get())
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return result
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}
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