[PyQt] a subclass for a c++ object
phil at riverbankcomputing.com
Sat Jun 26 09:13:22 BST 2010
On Sat, 26 Jun 2010 00:17:36 -0400, Blaine Bell
<blaine.bell at schrodinger.com> wrote:
> When I subclass a c++ object which is wrapped in SIP, I have found that
> I need to include all functions of that C++ object in the SIP interface
> that are used from within that class (or any of its subclasses). For
> example, this one class I am using in python subclasses a class that
> subclasses QAbstractProxyModel, and overrides the function
> "Qt::ItemFlags flags(const QModelIndex &index) const;". I do not use
> this function at all in python, but it doesn't get called unless I
> include it in the SIP interface. Can someone explain what is happening
> here? I would think that if that class is being instantiated properly,
> then inside C++ the interface should have all of the functions
> implemented. Is it possible I am not doing something right here?
SIP will generate a C++ reimplementation of flags() that works out if there
is a Python reimplementation and calls it if so.
If there is no Python version then it explicitly calls the most specific
C++ implementation that it knows about. It has to explicitly call it (i.e.
with an explicit scope) to avoid recursion. If you haven't told it about a
more specific version (because it doesn't appear in the corresponding .sip
file) then it can never be called.
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