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Author Amir Aslan Haghrah
Recipients Amir Aslan Haghrah
Date 2018-12-22.17:07:08
SpamBayes Score -1.0
Marked as misclassified Yes
Message-id <1545498428.94.0.0770528567349.issue35562@roundup.psfhosted.org>
In-reply-to
Content
If you define a structure which contains an 'c_int' and a 'c_double'  member. Then run the sizeof() function for it you get 16 as result as follows:

---------------------------------------------
from ctypes import c_int
from ctypes import c_double
from ctypes import sizeof
from ctypes import Structure
from struct import Struct

class issueInSizeof(Structure):
    _fields_ = [('KEY',     c_int),                
                ('VALUE',   c_double)]

print(sizeof(issueInSizeof))

---------------------------------------------
output:
16
---------------------------------------------

In continue if you add another 'c_int' to your structure and run sizeof() function as follows. It return 16 too.

---------------------------------------------
from ctypes import c_int
from ctypes import c_double
from ctypes import sizeof
from ctypes import Structure
from struct import Struct

class issueInSizeof(Structure):
    _fields_ = [('Index',   c_int),   
                ('KEY',     c_int),              
                ('VALUE',   c_double)]

print(sizeof(issueInSizeof))

---------------------------------------------
output:
16
---------------------------------------------

If python assume the size of 'c_int' 4, then it should return 12 in the first run. Also if it assume the size of 'c_int' 8 then it should return 24 in the second run.

thanks in advance.
History
Date User Action Args
2018-12-22 17:07:12Amir Aslan Haghrahsetrecipients: + Amir Aslan Haghrah
2018-12-22 17:07:08Amir Aslan Haghrahsetmessageid: <1545498428.94.0.0770528567349.issue35562@roundup.psfhosted.org>
2018-12-22 17:07:08Amir Aslan Haghrahlinkissue35562 messages
2018-12-22 17:07:08Amir Aslan Haghrahcreate