corelib/tools: Add two ### Qt 5 comments

A proposol to speed up qHash(QString) and QVector.

2 files changed, 6 insertions, 0 deletions

diff --git a/src/corelib/tools/qhash.cpp b/src/corelib/tools/qhash.cpp
index 66ec660..b6ba8b2 100644
--- a/src/corelib/tools/qhash.cpp
+++ b/src/corelib/tools/qhash.cpp
@@ -54,6 +54,10 @@
 
 QT_BEGIN_NAMESPACE
 
+
+// ### Qt 5: see tests/benchmarks/corelib/tools/qhash/qhash_string.cpp
+// Hashing of the whole string is a waste of cycles.
+
 /*
     These functions are based on Peter J. Weinberger's hash function
     (from the Dragon Book). The constant 24 in the original function
diff --git a/src/corelib/tools/qvector.h b/src/corelib/tools/qvector.h
index 56d1cca..9418642 100644
--- a/src/corelib/tools/qvector.h
+++ b/src/corelib/tools/qvector.h
@@ -115,6 +115,8 @@ class QVector
     };
 
 public:
+    // ### Qt 5: Consider making QVector non-shared to get at least one
+    // "really fast" container. See tests/benchmarks/corelib/tools/qvector/
     inline QVector() : d(&QVectorData::shared_null) { d->ref.ref(); }
     explicit QVector(int size);
     QVector(int size, const T &t);