No real changes, just use const_cast<> instead of C casts.

Replace many comments indicating that the C cast used was really a
const_cast<> with the proper cast itself. There is no reason to not use it any
longer, all the supported compilers understand it.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@65861 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/generic/grid.cpp

@@ -5892,8 +5892,8 @@ void wxGrid::EnableCellEditControl( bool enable )
 
 bool wxGrid::IsCurrentCellReadOnly() const
 {
-    // const_cast
-    wxGridCellAttr* attr = ((wxGrid *)this)->GetCellAttr(m_currentCellCoords);
+    wxGridCellAttr*
+        attr = const_cast<wxGrid *>(this)->GetCellAttr(m_currentCellCoords);
     bool readonly = attr->IsReadOnly();
     attr->DecRef();
 
@@ -7270,7 +7270,7 @@ void wxGrid::CacheAttr(int row, int col, wxGridCellAttr *attr) const
 {
     if ( attr != NULL )
     {
-        wxGrid *self = (wxGrid *)this;  // const_cast
+        wxGrid * const self = const_cast<wxGrid *>(this);
 
         self->ClearAttrCache();
         self->m_attrCache.row = row;
@@ -8164,7 +8164,7 @@ void wxGrid::AutoSizeColLabelSize( int col )
 
 wxSize wxGrid::DoGetBestSize() const
 {
-    wxGrid *self = (wxGrid *)this;  // const_cast
+    wxGrid * const self = const_cast<wxGrid *>(this);
 
     // we do the same as in AutoSize() here with the exception that we don't
     // change the column/row sizes, only calculate them