add const synonyms for wxGridTableBase::GetNumberRows/Cols(), using const_cast<> all the time is painful

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@55750 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/generic/grid.h

@@ -903,8 +903,21 @@ public:
 
     // You must override these functions in a derived table class
     //
+
+    // return the number of rows and columns in this table
     virtual int GetNumberRows() = 0;
     virtual int GetNumberCols() = 0;
+
+    // the methods above are unfortunately non-const even though they should
+    // have been const -- but changing it now is not possible any longer as it
+    // would break the existing code overriding them, so instead we provide
+    // these const synonyms which can be used from const-correct code
+    int GetRowsCount() const
+        { return wx_const_cast(wxGridTableBase *, this)->GetNumberRows(); }
+    int GetColsCount() const
+        { return wx_const_cast(wxGridTableBase *, this)->GetNumberCols(); }
+
+
     virtual bool IsEmptyCell( int row, int col ) = 0;
 
     bool IsEmpty(const wxGridCellCoords& coord)

interface/wx/grid.h

@@ -86,12 +86,42 @@ public:
     /// Destructor frees the attribute provider if it was created.
     virtual ~wxGridTableBase();
 
-    /// Must be overridden to return the number of rows in the table.
+    /**
+        Must be overridden to return the number of rows in the table.
+
+        For backwards compatibility reasons, this method is not const.
+        Use GetRowsCount() instead of it in const methods of derived table
+        classes.
+     */
     virtual int GetNumberRows() = 0;
 
-    /// Must be overridden to return the number of columns in the table.
+    /**
+        Must be overridden to return the number of columns in the table.
+
+        For backwards compatibility reasons, this method is not const.
+        Use GetColsCount() instead of it in const methods of derived table
+        classes,
+     */
     virtual int GetNumberCols() = 0;
 
+    /**
+        Return the number of rows in the table.
+
+        This method is not virtual and is only provided as a convenience for
+        the derived classes which can't call GetNumberRows() without a @c
+        const_cast from their const methods.
+     */
+    int GetRowsCount() const;
+
+    /**
+        Return the number of columns in the table.
+
+        This method is not virtual and is only provided as a convenience for
+        the derived classes which can't call GetNumberCols() without a @c
+        const_cast from their const methods.
+     */
+    int GetColsCount() const;
+
 
     /**
         Accessing table cells.