rdar136267186.swift

// RUN: %target-swift-frontend -O -emit-sil -verify %s

publicstructFoo{

@Clamped(0...1)
publicvarvalue:Double=1.0
}

@propertyWrapper
publicstructClamped<WrappedValue:Numeric&Comparable>{

publicinit(wrappedValue:WrappedValue, _ range:ClosedRange<WrappedValue>){
self.range = range
self._wrappedValue = wrappedValue.clamped(to: range)
}

publicletrange:ClosedRange<WrappedValue>

privatevar_wrappedValue:WrappedValue
publicvarwrappedValue:WrappedValue{
get{ _wrappedValue }
set{ _wrappedValue = newValue.clamped(to: range)}
}
}

publicextensionComparable{

func clamped(to range:ClosedRange<Self>, exceptions:Self...)->Self{clamped(to: range, exceptions: exceptions)}
func clamped(to range:ClosedRange<Self>, exceptions:anyCollection<Self>)->Self{

return exceptions.contains(self)
?self
:max(range.lowerBound,min(range.upperBound,self))
}

mutatingfunc clamp(to range:ClosedRange<Self>, exceptions:Self...){clamp(to: range, exceptions: exceptions)}
mutatingfunc clamp(to range:ClosedRange<Self>, exceptions:anyCollection<Self>){
self=self.clamped(to: range, exceptions: exceptions)
}
}