[C++-sig] Calling python virtual function from C++

[David Abrahams]

on Thu Jan 29 2009, William Marié <william.marie-AT-gmail.com> wrote:

> Hi David,
>
> Here is the reproducible test ( just change the boost.strap and the python paths in
> the jamroot ) !!
> Thanks for your time

	void testVirtualPure( BaseCmp* pBaseCmp )
	{
		this->get_override("testVirtualPure")( ptr( pBaseCmp ) );
	}                                           // ^^^^          ^

Creating Python objects that reference C++ objects by pointer is
dangerous; if you really want to do that, wrap the C++ pointer in
ptr(...).  Otherwise Boost.Python will try to copy it.  You declared
BaseCmp to be noncopyable, so no converter was registered that would
copy a BaseCmp object into a new Python object.

> David Abrahams a écrit :
>> on Wed Jan 28 2009, William Marié <william.marie-AT-gmail.com> wrote:
>>
>>   
>>> I need to call my testVirtualPure function from C++ side : BaseCmp* bc = BaseCmp();
>>> Base* b = Base();
>>> b->testVirtualPure( bc );
>>>
>>> But this causes an error : TypeError: No to_python (by-value) converter found for
>>> C++ type: class
>>> BaseCmp
>>>     
>>
>> The above doesn't compile, so you can't possibly be getting that
>> TypeError from it.  Please post the exact complete, reproducible example
>> that causes youi problems, after reducing it to a minimal test case.
>>
>> Thanks,
>>   
>
>
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-- 
Dave Abrahams
BoostPro Computing
http://www.boostpro.com