sync: implement map.LoadAndDelete

src/sync/map_test.go

@@ -0,0 +1,19 @@
+package sync_test
+
+import (
+	"sync"
+	"testing"
+)
+
+func TestMapLoadAndDelete(t *testing.T) {
+	var sm sync.Map
+	sm.Store("present", "value")
+
+	if v, ok := sm.LoadAndDelete("present"); !ok || v != "value" {
+		t.Errorf("LoadAndDelete returned %v, %v, want value, true", v, ok)
+	}
+
+	if v, ok := sm.LoadAndDelete("absent"); ok || v != nil {
+		t.Errorf("LoadAndDelete returned %v, %v, want nil, false", v, ok)
+	}
+}