Fix Run-Time Check Failure with MSVC when downcasting.

When you cast from a 64-bit type to a 32-bit one, MSVC produces an
RTCF, despite the explicit cast. The solution is to add & 0xFFFFFFFF.

Task-number: QTBUG-4255
Reviewed-by: Marius Storm-Olsen

1 files changed, 4 insertions, 4 deletions

diff --git a/src/corelib/tools/qhash.h b/src/corelib/tools/qhash.h
index 1918229..2de03dc 100644
--- a/src/corelib/tools/qhash.h
+++ b/src/corelib/tools/qhash.h
@@ -69,18 +69,18 @@ inline uint qHash(int key) { return uint(key); }
 inline uint qHash(ulong key)
 {
     if (sizeof(ulong) > sizeof(uint)) {
-        return uint((key >> (8 * sizeof(uint) - 1)) ^ key);
+        return uint(((key >> (8 * sizeof(uint) - 1)) ^ key) & (~0U));
     } else {
-        return uint(key);
+        return uint(key & (~0U));
     }
 }
 inline uint qHash(long key) { return qHash(ulong(key)); }
 inline uint qHash(quint64 key)
 {
     if (sizeof(quint64) > sizeof(uint)) {
-        return uint((key >> (8 * sizeof(uint) - 1)) ^ key);
+        return uint(((key >> (8 * sizeof(uint) - 1)) ^ key) & (~0U));
     } else {
-        return uint(key);
+        return uint(key & (~0U));
     }
 }
 inline uint qHash(qint64 key) { return qHash(quint64(key)); }