QMap - use hint on insert in QMap::toStdMap

Giving the std-map a hint (normally) improves insert performance.
There seems to be no reason not to provide this hint.

Change-Id: I4344607ebf54574a3ae9666d87a41a3c14762361
Reviewed-by: Robin Burchell <robin+qt@viroteck.net>
Reviewed-by: Lars Knoll <lars.knoll@digia.com>

1 files changed, 12 insertions, 0 deletions

diff --git a/tests/benchmarks/corelib/tools/qmap/main.cpp b/tests/benchmarks/corelib/tools/qmap/main.cpp
index 05b52ba42f..c3b9c18cd2 100644
--- a/tests/benchmarks/corelib/tools/qmap/main.cpp
+++ b/tests/benchmarks/corelib/tools/qmap/main.cpp
@@ -60,6 +60,7 @@ private slots:
     void lookup_string_int();
 
     void iteration();
+    void toStdMap();
 };
 
 
@@ -159,6 +160,17 @@ void tst_QMap::iteration()
     }
 }
 
+void tst_QMap::toStdMap()
+{
+    QMap<int, int> map;
+    for (int i = 0; i < 100000; ++i)
+        map.insert(i, i);
+
+    QBENCHMARK {
+        std::map<int, int> n = map.toStdMap();
+        n.begin();
+    }
+}
 
 QTEST_MAIN(tst_QMap)