xsbti.SafeLazy.scala Maven / Gradle / Ivy

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// needs to be in xsbti package (or a subpackage) to pass through the filter in DualLoader
//  and be accessible to the compiler-side interface
package xsbti

object SafeLazy
{
	def apply[T <: AnyRef](eval: xsbti.F0[T]): xsbti.api.Lazy[T] =
		apply( eval() )
	def apply[T <: AnyRef](eval: => T): xsbti.api.Lazy[T] =
		fromFunction0( eval _ )
	def fromFunction0[T <: AnyRef](eval: () => T): xsbti.api.Lazy[T] =
		new Impl( eval )

	def strict[T <: AnyRef](value: T): xsbti.api.Lazy[T] = apply(value)

	private[this] final class Impl[T <: AnyRef](private[this] var eval: () => T) extends xsbti.api.AbstractLazy[T]
	{
		private[this] lazy val _t =
		{
			val t = eval()
			eval = null // clear the reference, ensuring the only memory we hold onto is the result
			t
		}
		def get: T = _t
	}
}