time: add Duration.Abs

Fixes #51414 Change-Id: Ia3b1674f2a902c8396fe029397536643a3bc1784 GitHub-Last-Rev: 67159648af09e7a8ac2825a1fe71b2de3fb9d748 GitHub-Pull-Request: golang/go#51739 Reviewed-on: https://go-review.googlesource.com/c/go/+/393515 Run-TryBot: Ian Lance Taylor <[email protected]> TryBot-Result: Gopher Robot <[email protected]> Reviewed-by: Ian Lance Taylor <[email protected]> Reviewed-by: Emmanuel Odeke <[email protected]>
cloudflare · Mar 27, 2022 · 0bbd05b · 0bbd05b
1 parent 737837c
commit 0bbd05b
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diff --git a/api/next/51414.txt b/api/next/51414.txt
@@ -0,0 +1 @@
+pkg time, method (Duration) Abs() Duration #51414
diff --git a/src/time/time.go b/src/time/time.go
@@ -815,6 +815,19 @@ func (d Duration) Round(m Duration) Duration {
  return maxDuration // overflow
 }
 
+// Abs returns the absolute value of d.
+// As a special case, math.MinInt64 is converted to math.MaxInt64.
+func (d Duration) Abs() Duration {
+ switch {
+ case d >= 0:
+ return d
+ case d == minDuration:
+ return maxDuration
+ default:
+ return -d
+ }
+}
+
 // Add returns the time t+d.
 func (t Time) Add(d Duration) Time {
  dsec := int64(d / 1e9)

diff --git a/src/time/time_test.go b/src/time/time_test.go
@@ -1240,6 +1240,30 @@ func TestDurationRound(t *testing.T) {
  }
 }
 
+var durationAbsTests = []struct {
+ d Duration
+ want Duration
+}{
+ {0, 0},
+ {1, 1},
+ {-1, 1},
+ {1 * Minute, 1 * Minute},
+ {-1 * Minute, 1 * Minute},
+ {minDuration, maxDuration},
+ {minDuration + 1, maxDuration},
+ {minDuration + 2, maxDuration - 1},
+ {maxDuration, maxDuration},
+ {maxDuration - 1, maxDuration - 1},
+}
+
+func TestDurationAbs(t *testing.T) {
+ for _, tt := range durationAbsTests {
+ if got := tt.d.Abs(); got != tt.want {
+ t.Errorf("Duration(%s).Abs() = %s; want: %s", tt.d, got, tt.want)
+ }
+ }
+}
+
 var defaultLocTests = []struct {
  name string
  f func(t1, t2 Time) bool