Add QBENCMARK_ONCE to QTestLib.

The code block associated with QBENCHMARK_ONCE macro will only be executed once,
whether the backend returns a valid result or not. The "-iterations" command line
argument is also ignored.

This is useful for benchmarking code that has side effects.

Revby: jasplin

1 files changed, 8 insertions, 2 deletions

diff --git a/src/testlib/qbenchmark.h b/src/testlib/qbenchmark.h
index c06bfc0..87d34e7 100644
--- a/src/testlib/qbenchmark.h
+++ b/src/testlib/qbenchmark.h
@@ -64,7 +64,8 @@ namespace QTest
 class Q_TESTLIB_EXPORT QBenchmarkIterationController
 {
 public:
-    QBenchmarkIterationController();
+    enum RunMode { RepeatUntilValidMeasurement, RunOnce };
+    QBenchmarkIterationController(RunMode runMode);
     ~QBenchmarkIterationController();
     bool isDone();
     void next();
@@ -74,7 +75,12 @@ public:
 }
 
 #define QBENCHMARK \
-    for (QTest::QBenchmarkIterationController __iteration_controller; __iteration_controller.isDone() == false; __iteration_controller.next())
+    for (QTest::QBenchmarkIterationController __iteration_controller(QTest::QBenchmarkIterationController::RepeatUntilValidMeasurement); \
+            __iteration_controller.isDone() == false; __iteration_controller.next())
+
+#define QBENCHMARK_ONCE \
+    for (QTest::QBenchmarkIterationController __iteration_controller(QTest::QBenchmarkIterationController::RunOnce); \
+            __iteration_controller.isDone() == false; __iteration_controller.next())
 
 QT_END_NAMESPACE