Implement proper void pointer (void*) support

This change introduces a new type into the shiboken2 module which is
imported by calling "import PySide2.support.VoidPtr".

The type takes care of conversions from / to void* values in function
signatures.

Creating an instance can be done by passing either a shiboken wrapped
object, or an integer representing an address, or a python object that
implements the buffer interface.

For example, this is useful for passing numpy arrays to C OpenGL
functions that take void* parameters. First you convert the array into
a bytestring (using numpy.array.tobytes(), then you instantiate a
VoidPtr from that bytestring, and finally you pass it along to a GL
function.

One corner case that is currently not supported is void** parameters.

Change-Id: I01e291d6856cb6bd8b5175adc3ead6b728036535
Reviewed-by: Christian Tismer <tismer@stackless.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/sources/shiboken2/libshiboken/sbkconverter.cpp b/sources/shiboken2/libshiboken/sbkconverter.cpp
index ebd586a5e..0949d803d 100644
--- a/sources/shiboken2/libshiboken/sbkconverter.cpp
+++ b/sources/shiboken2/libshiboken/sbkconverter.cpp
@@ -45,6 +45,7 @@
 #include "autodecref.h"
 #include "sbkdbg.h"
 #include "helper.h"
+#include "voidptr.h"
 
 static SbkConverter** PrimitiveTypeConverters;
 
@@ -73,7 +74,7 @@ void init()
         Primitive<unsigned int>::createConverter(),
         Primitive<unsigned long>::createConverter(),
         Primitive<unsigned short>::createConverter(),
-        Primitive<void*>::createConverter()
+        VoidPtr::createConverter()
     };
     PrimitiveTypeConverters = primitiveTypeConverters;