Passing a struct* from one Cython class to anotherAre static class variables possible?How do I pass a variable by reference?Cython: overloaded constructor initialization using raw pointerHow to use a filepointer in a struct in cythonUsing a pointer array within a struct in CythonCython extension class: How do I expose methods in the auto-generated C struct?How to pass struct pointer to __cinit__ of Cython's cdef classInstantiating a C++ struct derived from a class in cythonCalling Cython from c++ with not built-in typesHow to pass Cython extension types as arguments to Cython functions/methods?
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Passing a struct* from one Cython class to another
Are static class variables possible?How do I pass a variable by reference?Cython: overloaded constructor initialization using raw pointerHow to use a filepointer in a struct in cythonUsing a pointer array within a struct in CythonCython extension class: How do I expose methods in the auto-generated C struct?How to pass struct pointer to __cinit__ of Cython's cdef classInstantiating a C++ struct derived from a class in cythonCalling Cython from c++ with not built-in typesHow to pass Cython extension types as arguments to Cython functions/methods?
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I am trying to pass a struct pointer from one Cython class to another. Here is some example code:
cdef struct MyStruct:
int a
int b
cdef class MyClass:
cdef MyStruct* s
def __init__(self):
self.s = <MyStruct*> malloc(sizeof(MyStruct))
self.s.a = 1
self.s.b = 2
cdef MyStruct* get_my_struct(self):
return self.s
cdef class PrinterClass:
cdef object m
def __init__(self):
self.m = MyClass()
cpdef print_struct(self):
cdef MyStruct* my_struct
my_struct = self.m.get_my_struct()
print(my_struct.a)
When I try to compile this class, I get these 2 errors around the my_struct = self.m.get_my_struct() line:
Cannot convert Python object to 'MyStruct *
and
Storing unsafe C derivative of temporary Python reference
Why is Cython attempting to do conversions here? Can't it just pass the pointer as is?
python cython
edited Mar 7 at 23:54
Pikachu the Purple Wizard
2,03161429
asked Mar 7 at 23:41
slushislushi
9721019
add a comment |
I am trying to pass a struct pointer from one Cython class to another. Here is some example code:
cdef struct MyStruct:
int a
int b
cdef class MyClass:
cdef MyStruct* s
def __init__(self):
self.s = <MyStruct*> malloc(sizeof(MyStruct))
self.s.a = 1
self.s.b = 2
cdef MyStruct* get_my_struct(self):
return self.s
cdef class PrinterClass:
cdef object m
def __init__(self):
self.m = MyClass()
cpdef print_struct(self):
cdef MyStruct* my_struct
my_struct = self.m.get_my_struct()
print(my_struct.a)
When I try to compile this class, I get these 2 errors around the my_struct = self.m.get_my_struct() line:
Cannot convert Python object to 'MyStruct *
and
Storing unsafe C derivative of temporary Python reference
Why is Cython attempting to do conversions here? Can't it just pass the pointer as is?
python cython
edited Mar 7 at 23:54
Pikachu the Purple Wizard
2,03161429
asked Mar 7 at 23:41
slushislushi
9721019
add a comment |
I am trying to pass a struct pointer from one Cython class to another. Here is some example code:
cdef struct MyStruct:
int a
int b
cdef class MyClass:
cdef MyStruct* s
def __init__(self):
self.s = <MyStruct*> malloc(sizeof(MyStruct))
self.s.a = 1
self.s.b = 2
cdef MyStruct* get_my_struct(self):
return self.s
cdef class PrinterClass:
cdef object m
def __init__(self):
self.m = MyClass()
cpdef print_struct(self):
cdef MyStruct* my_struct
my_struct = self.m.get_my_struct()
print(my_struct.a)
When I try to compile this class, I get these 2 errors around the my_struct = self.m.get_my_struct() line:
Cannot convert Python object to 'MyStruct *
and
Storing unsafe C derivative of temporary Python reference
Why is Cython attempting to do conversions here? Can't it just pass the pointer as is?
python cython
edited Mar 7 at 23:54
Pikachu the Purple Wizard
2,03161429
asked Mar 7 at 23:41
slushislushi
9721019
I am trying to pass a struct pointer from one Cython class to another. Here is some example code:
cdef struct MyStruct:
int a
int b
cdef class MyClass:
cdef MyStruct* s
def __init__(self):
self.s = <MyStruct*> malloc(sizeof(MyStruct))
self.s.a = 1
self.s.b = 2
cdef MyStruct* get_my_struct(self):
return self.s
cdef class PrinterClass:
cdef object m
def __init__(self):
self.m = MyClass()
cpdef print_struct(self):
cdef MyStruct* my_struct
my_struct = self.m.get_my_struct()
print(my_struct.a)
When I try to compile this class, I get these 2 errors around the my_struct = self.m.get_my_struct() line:
Cannot convert Python object to 'MyStruct *
and
Storing unsafe C derivative of temporary Python reference
Why is Cython attempting to do conversions here? Can't it just pass the pointer as is?
python cython
python cython
edited Mar 7 at 23:54
Pikachu the Purple Wizard
2,03161429
asked Mar 7 at 23:41
slushislushi
9721019
edited Mar 7 at 23:54
Pikachu the Purple Wizard
2,03161429
asked Mar 7 at 23:41
slushislushi
9721019
edited Mar 7 at 23:54
Pikachu the Purple Wizard
2,03161429
edited Mar 7 at 23:54
Pikachu the Purple Wizard
2,03161429
edited Mar 7 at 23:54
Pikachu the Purple Wizard
2,03161429
2,03161429
asked Mar 7 at 23:41
slushislushi
9721019
asked Mar 7 at 23:41
slushislushi
9721019
asked Mar 7 at 23:41
slushislushi
9721019
9721019
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
In PrinterClass, replace cdef object m with cdef MyClass m or explicitly cast self.m to MyClass: my_struct = (<MyClass>self.m).get_my_struct(). (In addition, a __dealloc__ should be added to MyClass).
I guess the difference lies in that object is a python object(in essence,dict), while cdef class is another kind of class(in essence, struct), see Extension types (aka. cdef classes).
Expect further revelations from other experts :)
answered Mar 8 at 1:30
oz1oz1
377311
add a comment |
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1 Answer
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1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
In PrinterClass, replace cdef object m with cdef MyClass m or explicitly cast self.m to MyClass: my_struct = (<MyClass>self.m).get_my_struct(). (In addition, a __dealloc__ should be added to MyClass).
I guess the difference lies in that object is a python object(in essence,dict), while cdef class is another kind of class(in essence, struct), see Extension types (aka. cdef classes).
Expect further revelations from other experts :)
answered Mar 8 at 1:30
oz1oz1
377311
add a comment |
In PrinterClass, replace cdef object m with cdef MyClass m or explicitly cast self.m to MyClass: my_struct = (<MyClass>self.m).get_my_struct(). (In addition, a __dealloc__ should be added to MyClass).
I guess the difference lies in that object is a python object(in essence,dict), while cdef class is another kind of class(in essence, struct), see Extension types (aka. cdef classes).
Expect further revelations from other experts :)
answered Mar 8 at 1:30
oz1oz1
377311
add a comment |
In PrinterClass, replace cdef object m with cdef MyClass m or explicitly cast self.m to MyClass: my_struct = (<MyClass>self.m).get_my_struct(). (In addition, a __dealloc__ should be added to MyClass).
I guess the difference lies in that object is a python object(in essence,dict), while cdef class is another kind of class(in essence, struct), see Extension types (aka. cdef classes).
Expect further revelations from other experts :)
answered Mar 8 at 1:30
oz1oz1
377311
In PrinterClass, replace cdef object m with cdef MyClass m or explicitly cast self.m to MyClass: my_struct = (<MyClass>self.m).get_my_struct(). (In addition, a __dealloc__ should be added to MyClass).
I guess the difference lies in that object is a python object(in essence,dict), while cdef class is another kind of class(in essence, struct), see Extension types (aka. cdef classes).
Expect further revelations from other experts :)
answered Mar 8 at 1:30
oz1oz1
377311
answered Mar 8 at 1:30
oz1oz1
377311
answered Mar 8 at 1:30
oz1oz1
377311
answered Mar 8 at 1:30
oz1oz1
377311
377311
add a comment |
add a comment |
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