1 package kotlinx.coroutines.flow.internal 2 3 import kotlinx.coroutines.internal.* 4 import kotlin.jvm.* 5 6 /** 7 * This value is used a a surrogate `null` value when needed. 8 * It should never leak to the outside world. 9 * Its usage typically are paired with [Symbol.unbox] usages. 10 */ 11 @JvmField 12 internal val NULL = Symbol("NULL") 13 14 /** 15 * Symbol to indicate that the value is not yet initialized. 16 * It should never leak to the outside world. 17 */ 18 @JvmField 19 internal val UNINITIALIZED = Symbol("UNINITIALIZED") 20 21 /* 22 * Symbol used to indicate that the flow is complete. 23 * It should never leak to the outside world. 24 */ 25 @JvmField 26 internal val DONE = Symbol("DONE") 27