On Mon, 10 May 2010 15:53:50 -0700, Nathan Cournia <cour...@gmail.com>
wrote:
> Hi,
>
> I'm currently trying to use %MappedType to allow my QT code to
> interact with C++ objects that have been wrapped using SWIG. My .sip
> file currently looks like:
>
> %MappedType Node /NoDefaultCtors/
> {
>
> %TypeHeaderCode
> #include <foo/Node.h>
> using namespace foo;
> %End
>
> %ConvertFromTypeCode
> return sipCpp->getPyObject();
> %End
>
> %ConvertToTypeCode
> if (!sipIsErr) {
> return foo::Node::isNode(sipPy);
> }
>
> *sipCppPtr = foo::Node::asNode(sipPy);
>
> if (!*sipCppPtr) {
> *sipIsErr = 1;
> return 0;
> } else {
> return SIP_TEMPORARY;
> }
> %End
>
> };
>
> Can %MappedType be used to tell SIP about Python objects that have
> been wrapped with SWIG? Is this a good idea?
>
> The following code is generated:
>
> extern "C" {static void assign_Node(void *, SIP_SSIZE_T, const void *);}
> static void assign_Node(void *sipDst, SIP_SSIZE_T sipDstIdx, const void
> *sipSrc)
> {
> reinterpret_cast<Node *>(sipDst)[sipDstIdx] =
> *reinterpret_cast<const Node *>(sipSrc);
> }
>
>
> extern "C" {static void *array_Node(SIP_SSIZE_T);}
> static void *array_Node(SIP_SSIZE_T sipNrElem)
> {
> return new Node[sipNrElem];
> }
>
>
> extern "C" {static void *copy_Node(const void *, SIP_SSIZE_T);}
> static void *copy_Node(const void *sipSrc, SIP_SSIZE_T sipSrcIdx)
> {
> return new Node(reinterpret_cast<const Node *>(sipSrc)[sipSrcIdx]);
> }
>
>
> /* Call the mapped type's destructor. */
> extern "C" {static void release_Node(void *, int);}
> static void release_Node(void *ptr, int)
> {
> Py_BEGIN_ALLOW_THREADS
> delete reinterpret_cast<Node *>(ptr);
> Py_END_ALLOW_THREADS
> }
> #endif
>
>
> This poses several problems. First, foo::Node's assignment and copy
> constructors have been hidden/disabled. This means assign_Node and
> copy_Node do not work. Is there a way to disable the generation of
> assign_Node and copy_Node?
>
> Second, I do not want SIP to call delete on the Node in release_Node.
> foo::Node is internally reference counted, The SWIG bindings are aware
> of this and should decrement foo::Node's reference count when the
> PyObject is released. Can I disabled the generation of release_Node?
/NoDefaultCtors/ is a class annotation, not a mapped type annotation.
Replace it with /NoRelease/ and all those functions will be suppressed.
Phil
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