Introduce ClockMark.hasPassedNow, hasNotPassedNow functions

Makes it more clear to use them than comparing elapsed with Duration.ZERO.

libraries/stdlib/src/kotlin/time/Clock.kt

@@ -52,6 +52,23 @@ public abstract class ClockMark {
      * The returned clock mark is more _early_ when the [duration] is positive, and more _late_ when the [duration] is negative.
      */
     public open operator fun minus(duration: Duration): ClockMark = plus(-duration)
+
+
+    /**
+     * Returns true if this clock mark has passed according to the clock from which this mark was taken.
+     *
+     * Note that the value returned by this function can change on subsequent invocations.
+     * If the clock is monotonic, it can change only from `false` to `true`, namely, when the clock mark becomes behind the current point of the clock.
+     */
+    public fun hasPassedNow(): Boolean = !elapsedNow().isNegative()
+
+    /**
+     * Returns false if this clock mark has not passed according to the clock from which this mark was taken.
+     *
+     * Note that the value returned by this function can change on subsequent invocations.
+     * If the clock is monotonic, it can change only from `true` to `false`, namely, when the clock mark becomes behind the current point of the clock.
+     */
+    public fun hasNotPassedNow(): Boolean = elapsedNow().isNegative()
 }
 
 @ExperimentalTime

libraries/stdlib/test/time/ClockMarkTest.kt

@@ -14,12 +14,19 @@ class ClockMarkTest {
     fun adjustment() {
         val clock = TestClock()
 
-        val mark = clock.markNow()
+        fun ClockMark.assertHasPassed(hasPassed: Boolean) {
-        val markFuture1 = mark + 1.milliseconds
+            assertEquals(!hasPassed, this.hasNotPassedNow(), "Expected mark in the future")
-        val markFuture2 = mark - (-1).milliseconds
+            assertEquals(hasPassed, this.hasPassedNow(), "Expected mark in the past")
 
-        val markPast1 = mark - 1.milliseconds
+            assertEquals(!hasPassed, this.elapsedNow() < Duration.ZERO, "Mark elapsed: ${this.elapsedNow()}, expected hasPassed: $hasPassed")
-        val markPast2 = markFuture1 + (-2).milliseconds
+        }
+
+        val mark = clock.markNow()
+        val markFuture1 = (mark + 1.milliseconds).apply { assertHasPassed(false) }
+        val markFuture2 = (mark - (-1).milliseconds).apply { assertHasPassed(false) }
+
+        val markPast1 = (mark - 1.milliseconds).apply { assertHasPassed(true) }
+        val markPast2 = (markFuture1 + (-2).milliseconds).apply { assertHasPassed(true) }
 
         clock += 500_000.nanoseconds
 
@@ -33,5 +40,14 @@ class ClockMarkTest {
 
         assertEquals(elapsedFromPast, markPast1.elapsedNow())
         assertEquals(elapsedFromPast, markPast2.elapsedNow())
+
+        markFuture1.assertHasPassed(false)
+        markPast1.assertHasPassed(true)
+
+        clock += 1.milliseconds
+
+        markFuture1.assertHasPassed(true)
+        markPast1.assertHasPassed(true)
+
     }
 }

libraries/tools/binary-compatibility-validator/reference-public-api/kotlin-stdlib-runtime-merged.txt

@@ -5288,6 +5288,8 @@ public abstract interface class kotlin/time/Clock {
 public abstract class kotlin/time/ClockMark {
 	public fun <init> ()V
 	public abstract fun elapsedNow ()D
+	public final fun hasNotPassedNow ()Z
+	public final fun hasPassedNow ()Z
 	public fun minus-LRDsOJo (D)Lkotlin/time/ClockMark;
 	public fun plus-LRDsOJo (D)Lkotlin/time/ClockMark;
 }