[C++-sig] Get parameter info of function or method
Hi, I'm currently generating doc for my live boost.python classes, instances and function. But I can't find any way to retrieve the parameter info of functions and its signature because it has no __code__ attribute due to it's written I C++. Any solution to this? ___ Cplusplus-sig mailing list Cplusplus-sig@python.org http://mail.python.org/mailman/listinfo/cplusplus-sig
Re: [C++-sig] TypeError: No to_python (by-value) converter found for C++ type: class std::basic_ostream >
And I forgot to tell you, the python class in an extension of a c++
class. Hence I have the serialise and deserialise function defined in
python.
// Simon
On 29 sep 2010, at 16.02, Jakub Zytka wrote:
On 09/29/10 14:11, Simon W wrote:
Thank you for the answer. Is there any way I can prevent it from
copying the
stream object even though std::ostream::write() returns a
std::ostream& ?
You can use other return policy, or define one on your own.
http://www.boost.org/doc/libs/1_44_0/libs/python/doc/tutorial/doc/html/python/functions.html#python.call_policies
But honestly, I do not think it is the correct way to go. Read below.
> I'm trying to serialise some data. I have a c++ class:
> class ostream
> {
> ...
> could to the c++ way and add a integer before the byte stream that
reveal how
> big it is. But How can i serialise an int from python that takes
up constant
> "byte-size" for an integer between lets say 0-1!?
Everything can be done, but I have a different question:
I haven't followed all your previous emails, but do you *really*
need to implement serialization code in python?
Somehow I feel it is very weird that on one hand you want to have
serialization code in python, and yet use ostream.
What would be wrong with coding serialization purely in C++, and
then providing appropriate pickle suite to python:
struct MyPickleSuite
{
// ...
boost::python::tuple MyPickleSuite::getstate(MyClass & object)
{
std::ostringstream oStream(ios_base::binary);
serialize(oStream, object);
return boost::python::make_tuple(oStream.str());
}
void MyPickleSuite::setstate(MyClass & object, boost::python::tuple
state)
{
// verify tuple correctness etc.
std::string serializedData = extract(state[0]);
std::istringstream iStream(serializedData, ios_base::binary);
serialize(iStream, object); // NOTE: you can use the same code for
serialization and deserialization. stream type should determine
actual behavior
}
}
That way you do not have to expose ostream to python at all. In fact
if you wanted to switch to another type of stream (imagine that you
have a custom stream implementation, which provides eg. type
checking) it is cheap. You only change a few functions in your
pickle suite, nothing more.
Even if you do really need to define serialization in python I see
no reason to play with streams. I'd rather had a wrapper which hides
underlying implementation (eg. std::streams) and operates on strings.
Please reconsider your design.
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Re: [C++-sig] Abstract class instances to-python conversion
You could use the reload() function in python 2.7 or imp.reload() in python 3. It takes a module object as argument. // Simon On 1 aug 2011, at 12:00, Valentin Perrelle wrote: > >> All of that sounds sounds. But at what point were you trying to register a >> to-python converter? It sounded like you were trying to do that before >> importing the module, and since a to-python converter is by definition C++, >> I didn't understand how you could do it in a Python script before importing >> the module. > > I'm registering the converter by calling the boost::python::import function > in C++ code. I don't know any other way to do that. > > Now, this give me another error. I'm trying to implement a "reload script" > feature. I thought that all i had to do was to call Py_Finalize, then > Py_Initialize again, and to remove any references i was holding to wrapping > classes. But whenever i'm importing my extension again, i get the runtime > error: > > Assertion failed: slot->m_to_python == 0, file > libs\python\src\converter\registry.cpp, line 212 > > which means my to_python converter have been registered once again. Is there > a way to unregister them ? should i find a to not initialize the extension > again ? > > ___ > Cplusplus-sig mailing list > Cplusplus-sig@python.org > http://mail.python.org/mailman/listinfo/cplusplus-sig ___ Cplusplus-sig mailing list Cplusplus-sig@python.org http://mail.python.org/mailman/listinfo/cplusplus-sig
Re: [C++-sig] Abstract class instances to-python conversion
In My program I need to unload modules as well. What I do is remove all references to the particular module and it will be unloaded. Are you using boost python for python 2 or 3? If it's the latter it is safe to use Py_Finalize()! I use it myself! // Simon On 1 aug 2011, at 12:58, Valentin Perrelle wrote: > >> You could use the reload() function in python 2.7 or imp.reload() in python >> 3. It takes a module object as argument. > Thanks. However it wouldn't reset to the initial state in the general case. > All modules needs to be unloaded. I don't know a safe way to it yet. I'm just > sure i want to do it in c++ not in Python. > > I've just found that the call of Py_Finalize with Boost.Python is a known > issue, already discussed on this mailing list and that the manual says not to > call it : > http://www.boost.org/doc/libs/1_47_0/libs/python/doc/tutorial/doc/html/python/embedding.html > > ___ > Cplusplus-sig mailing list > Cplusplus-sig@python.org > http://mail.python.org/mailman/listinfo/cplusplus-sig ___ Cplusplus-sig mailing list Cplusplus-sig@python.org http://mail.python.org/mailman/listinfo/cplusplus-sig
Re: [C++-sig] Abstract class instances to-python conversion
You can remove one reference from the sys module:
Import sys
del sys.modules['mymodule']
In cpp it would be like:
import('sys').attr('modules')['mymodule'].del()
I can give you my code later. Don't have it here!
// Simon
On 1 aug 2011, at 13:38, Valentin Perrelle wrote:
> Le 01/08/2011 13:19, Simon Warg a écrit :
>> In My program I need to unload modules as well. What I do is remove all
>> references to the particular module and it will be unloaded.
> It seems i didn't achieve to do that. There should be some references i can't
> remove, i don't know why yet.
>
>>
>> Are you using boost python for python 2 or 3? If it's the latter it is safe
>> to use Py_Finalize()! I use it myself!
> I'm using Python 3. But the problem of unregistered converters is still
> there. See
> http://mail.python.org/pipermail/cplusplus-sig/2009-August/014736.html
>
>
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