Hi guys,
I have a problem building a python c++ extension and, in particular, the
problem occurs when I try to map C++ exceptions to python exceptions.
Here is a simple example:
========================================================================
### Cpp_Rectangle.pxd
cdef extern from "Rectangle.h":
ctypedef struct cpp_Rectangle "Rectangle":
int raiseException() except +
cpp_Rectangle* new_Rectangle "new Rectangle"( int x0, int y0, int x1,
int y1 )
void delete_Rectangle "delete"( cpp_Rectangle* rect )
========================================================================
### PyRectangle.pyx
cimport Cpp_Rectangle
cdef class Rectangle:
cdef Cpp_Rectangle.cpp_Rectangle* thisptr
def __init__( self, int x0, int y0, int x1, int y1 ):
self.thisptr = Cpp_Rectangle.new_Rectangle( x0, y0, x1, y1 )
def __del__( self ):
Cpp_Rectangle.delete_Rectangle( self.thisptr )
def raiseException( self ):
self.thisptr.raiseException()
=========================================================================
How you can see in the Cpp_Rectangle.pyd, I am trying to use the
"except +" feature to map the exceptions generated by the raiseException
function into a Python RuntimeError.
The cython --cplus runs fine, but when I try to compile the
PyRectangle.cpp then I got the following errors:
=========================================================================
[sim...@spider Cython_Test]$ g++ -shared -fPIC -I/usr/include/python2.5
-o PyRectangle.so PyRectangle.cpp -L /usr/lib64 -L. -lRectangle -lpython2.5
PyRectangle.cpp: In function 'void __Pyx_CppExn2PyErr()':
PyRectangle.cpp:277: error: expected unqualified-id before '&' token
PyRectangle.cpp:277: error: ISO C++ forbids declaration of 'type name'
with no type
PyRectangle.cpp:277: error: expected `)' before '&' token
PyRectangle.cpp:277: error: expected `{' before '&' token
PyRectangle.cpp:277: error: 'exn' was not declared in this scope
PyRectangle.cpp:277: error: expected `;' before ')' token
PyRectangle.cpp:280: error: expected primary-expression before 'catch'
PyRectangle.cpp:280: error: expected `;' before 'catch'
PyRectangle.cpp:283: error: expected primary-expression before 'catch'
PyRectangle.cpp:283: error: expected `;' before 'catch'
==========================================================================
The errors occur because the the inclusion of the stdexcept header is
missing.
Is it a cython bug or it is up to the user to add the inclusion?
Actually, I have solved the problem adding the following rows to my
Cpp_Rectangle.pxd file, but I don't know if it is the right way to procede:
==========================================================================
cdef extern from "stdexcept":
pass
==========================================================================
Another error happens when I change my Cpp_Rectangle.pxd like this:
==========================================================================
### Cpp_Rectangle.pxd
cdef extern from "stdexcept":
pass
cdef extern from "Rectangle.h":
ctypedef struct cpp_Rectangle "Rectangle":
int raiseException() except +MemoryError
cpp_Rectangle* new_Rectangle "new Rectangle"( int x0, int y0, int x1,
int y1 )
void delete_Rectangle "delete"( cpp_Rectangle* rect )
=========================================================================
Basically I am trying now to map each exception thrown by the
raiseException to a python MemoryError exception.
The cython compilation runs fine again, but when I try to compile the
.cpp file I got the errors:
=========================================================================
[sim...@spider Cython_Test]$ g++ -shared -fPIC -I/usr/include/python2.5
-o PyRectangle.so PyRectangle.cpp -L /usr/lib64 -L. -lRectangle -lpython2.5
PyRectangle.cpp: In function 'PyObject*
__pyx_pf_11PyRectangle_9Rectangle_raiseException(PyObject*, PyObject*)':
PyRectangle.cpp:454: error: '__pyx_builtin_MemoryError' was not declared
in this scope
==========================================================================
The accused piece of code is the following:
==========================================================================
/* __pyx_t_1 allocated */
try {
__pyx_t_1 =
((struct__pyx_obj_11PyRectangle_Rectangle*)__pyx_v_self)->thisptr->raiseException();}
catch(...) {PyErr_SetString(__pyx_builtin_MemoryError, "");
{__pyx_filename = __pyx_f[0]; __pyx_lineno = 14; __pyx_clineno =
__LINE__; goto __pyx_L1_error;}}
=============================================================================
The variable __pyx_builtin_MemoryError is not declared anywhere.
Should the __pyx_builtin_MemoryError be substituted with PyExc_MemoryError?
The version of cython I am using is the 0.11
Thanks in advance and sorry for my long email.
Ciao,
Simone
begin:vcard
fn:Simone Bisogni
n:Bisogni;Simone
org:Tekno-Soft
adr:;;Via Marconi, 1;Oristano;OR;09170;Italy
email;internet:[email protected]
title:Dott. Ing.
tel;work:(+39) 0783 71339 202
tel;fax:(+39) 0783 71339 502
note;quoted-printable:=0D=0A=
-----BEGIN PGP PUBLIC KEY BLOCK-----=0D=0A=
Version: GnuPG v2.0.9 (GNU/Linux)=0D=0A=
=0D=0A=
mQGiBElYre8RBACTKLTX5qXr0HfBwKdoQWmi01slRem5cqJZLerN5PRBwmz6jtZP=0D=0A=
oy/dQZogdED3TES+dq3wFXUSf4k/2a+hvUQDzAOiK92jFa9WAHE1bUl2vpLuKgBU=0D=0A=
1RWexDhBcACDXS/FhgrkCe3B+DNk5vGemEKJs1Tt6vBC+QEO5MQNRSgHYwCgvHvC=0D=0A=
O44FrHgPJZJ7lW2Ehj0MjYED/iTFDs2/5pWNYegfkvhJABFkA2E2hjFLiuBZBsbx=0D=0A=
N8dPEKC955U2hA1Q1lkhZRK7uxuS33k87xJAw7+E5keiQL+gWSZaLK/tFn3NC2rH=0D=0A=
1HJvzqPi4NVJJ8SSZ3tCcO2Qh2PYgNHUjkE040spyacr3M7LzhklPLVL5Ne/ijEu=0D=0A=
zrE9A/wPJpC68+cf203l6AXAMpqjpQCiNm/+Wl6cAQZ1bSQ0oXbtEX1illIptd79=0D=0A=
1wCKKh4QL4tu10TJtkeJiDpnzdy5CVA8xKlygBL7stktd93E30aMJCVYr92HkWAj=0D=0A=
a3G/dXaJP533wBBOnvWfY+h+MskCpsc6GcJ83WTnYtbzDk3D0rQ5U2ltb25lIEJp=0D=0A=
c29nbmkgKFRydXN0IGlzIHdlYWtuZXNzKSA8c2ltb25lQHRla25vLXNvZnQuaXQ+=0D=0A=
iGAEExECACAFAklYre8CGwMGCwkIBwMCBBUCCAMEFgIDAQIeAQIXgAAKCRCOKENR=0D=0A=
YGw4NwjkAJwMCZEo/lDlgA/RjmximV64Iwxy/wCgsFWtzaG1KUwwz3cqfgSyBdbv=0D=0A=
yxu5Ag0ESVit7xAIAKXZbwJO5j8xE3+k3le55vPL7XvpmCM/2Ia0ib65vRj4SJ29=0D=0A=
uqA490RYgi2B2VI9Fj+ApOfv7WzArp8ftFi0lX32PTIvpvdYC3NSnQFw0vJ4i8Jc=0D=0A=
VPkkkJaoxddtxPzZvCA6fPyGQ6OIygdQRgrnSrF66kTFZHU/IGWZT6bjC2s/2Mnt=0D=0A=
QMmQWefKefWwORwDJd1Qr+N73tG4VYw2Kt2iHxRhIJ0TXNto6xrzw4wHhl7FY81b=0D=0A=
Jk4xlja0LvfBDzvPOFwTq3EkyDkMkagxiRxyuGkbiir6m8BAoII0aRF2bvYjFyJD=0D=0A=
u+P08Ft7YgrY5lu4J775IfuxsoYersUN8fpmpI8AAwUH/ReiArgqMfFTudbPLPIr=0D=0A=
l1ULClrIzvO3G0brkoc/MK9ndORnFqdMEea6WhnnM+H+URB0X+H42wWxCS9s3qkQ=0D=0A=
y7h2fdTytV6ns0Tw4EcQHy/K1gM6G78ynI1uGJ2XoOtJW/nx52ncvW7ztSAKYel5=0D=0A=
bB5oF9LNWc5w9aSPt+ixg+Rc93hWztTS6pH9bS2c0fKAyaFUF03tNg3vsfmjORo+=0D=0A=
LKAZPu8C+mcCrcz47ZfG974K8xB69BrJ7lNYzVmRY6n7JS5vwr/X8Jip/e4Xeu0n=0D=0A=
Vi1wlE7kaVIF0vZOcMbdJaI1tN1hx9kavZsgDNkn4qurLCdmSiKxYP0rokxJuOkG=0D=0A=
DsmISQQYEQIACQUCSVit7wIbDAAKCRCOKENRYGw4N0DOAKCLmS0I/z3gejeA1Rmf=0D=0A=
Ak93hxJV6ACfSAqHR3CvarjUOrJtVkKsTUBwXck=3D=0D=0A=
=3D+mqh=0D=0A=
-----END PGP PUBLIC KEY BLOCK-----
x-mozilla-html:TRUE
url:http://www.tekno-soft.it
version:2.1
end:vcard
_______________________________________________
Cython-dev mailing list
[email protected]
http://codespeak.net/mailman/listinfo/cython-dev
