qquick3dparticleutils: check extent of qt_quick3d_sine_table[]HEADdev

Let the compiler count the number of elements in
qt_quick3d_sine_table[], and then statically assert that it's as
expected. We had enough cases where zero-inialized elements were added
at the end silently by using the old technique.

As a drive-by, add Q_CONSTINIT.

Amends 0b4f59d0660b9d508c394e0b3039637364c89287.

Pick-to: 6.10 6.9 6.8 6.5
Change-Id: I1c3f6136803f5d2e292ea7eb827ef470efb54a61
Reviewed-by: Volker Hilsheimer <[email protected]>

1 files changed, 4 insertions, 1 deletions

diff --git a/src/quick3dparticles/qquick3dparticleutils.cpp b/src/quick3dparticles/qquick3dparticleutils.cpp
index 719f0615..3514b6e0 100644
--- a/src/quick3dparticles/qquick3dparticleutils.cpp
+++ b/src/quick3dparticles/qquick3dparticleutils.cpp
@@ -6,9 +6,11 @@
 
 #include <QtGui/qquaternion.h>
 
+#include <iterator>
+
 QT_BEGIN_NAMESPACE
 
-const float qt_quick3d_sine_table[QT_QUICK3D_SINE_TABLE_SIZE] = {
+Q_CONSTINIT const float qt_quick3d_sine_table[] = {
     float(0.0),
     float(0.024541228522912288),
     float(0.049067674327418015),
@@ -266,6 +268,7 @@ const float qt_quick3d_sine_table[QT_QUICK3D_SINE_TABLE_SIZE] = {
     float(-0.049067674327418091),
     float(-0.024541228522912448)
 };
+static_assert(std::size(qt_quick3d_sine_table) == QT_QUICK3D_SINE_TABLE_SIZE);
 
 QQuick3DNode *getSharedParentNode(QQuick3DNode *node, QQuick3DNode *system) {
     QQuick3DNode *systemSharedParent = nullptr;