SWIFT: Stream generic functions for NSView and NSCell to allow quick initialisation of properties

AppKit+propertyStreamer.swift

/// Stream generic functions for NSView and NSCell to allow quick initialisation of properties
/// Useful for when your (eg) button variable has a long name or is optional.

func <<<T> (left: T, configureBlock: (T) -> Void) -> T where T: NSView {
  configureBlock(left)
  return left
}
func <<<T> (left: T, configureBlock: (T) -> Void) -> T where T: NSCell {
  configureBlock(left)
  return left
}

/// Usage:
///  self.performTaskButton = NSButton() << {
///    $0.setButtonType(.toggle)
///    $0.title = "Button!"
///    $0.alternativeTitle = "button pressed"
///    $0.setContentHuggingPriority(.required, for: .horizontal)
///    $0.setContentHuggingPriority(.required, for: .vertical)
///    $0.setContentCompressionResistancePriority(.required, for: .horizontal)
///    $0.setContentCompressionResistancePriority(.required, for: .vertical)
///  }