On Tue, May 25, 2010 at 11:34 PM, Leonhard Weber
<lweberk@gmail.com> wrote:
Made a mistake... srry for my lacking knowledge/experience in C++. Trying to improve :D.
For test purposes I changed the Python Script so it inits an instance, and then tries to fetch the instance through the PyCallback:
#####
from EngineCallback import *
a = EngineCallback()
b = PyCallback(a)
>>> a
<EngineCallback.EngineCallback object at 0x7ffbe74c5208>
>>> b
<EngineCallback.EngineCallback object at 0x7ffbe74b0050>
#####
On the C++ side I had to change this, its now passing the argument by value (which I dont want)
shared_ptr<EngineCallback> PyCallback( EngineCallback* test ) { return shared_ptr<EngineCallback>(test); }
If I passed it per reference EngineCallback* &test (hope Im getting the jargon right and not mixing up definitions) it would say:
did not match C++ signature:
PyCallback(EngineCallback* {lvalue})
by changing it to pass by value it works, though isnt it making a copy of the instance? how do I get just a reference to the instance passed to Python?
On 25 May 2010 16:56, Steven Watanabe
<watanabesj@gmail.com> wrote:
AMDG
Leonhard Weber wrote:
EngineCallback* test = new EngineCallback;
// Entrypoint for Python to come ant fetch the Application Callback
shared_ptr<EngineCallback> PyCallback( EngineCallback* &test );
<snip>
# test.py
from EngineCallback import PyCallback
from EngineCallback import EngineCallback
test = PyCallback()
PyCallback takes one argument. Hence the exception below.
Did you intend to use the global "test" instead of taking test
as an argument in PyCallback?
Traceback (most recent call last):
File "test.py", line 5, in <module>
test = PyCallback()
Boost.Python.ArgumentError: Python argument types in
EngineCallback.PyCallback()
did not match C++ signature:
PyCallback(EngineCallback* {lvalue})
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