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How do pointer to pointers work in C?
...24HeapMemory(int **p)
{
*p = malloc(1024);
if(*p == 0)
return -1;//error
else
return 0;//success
}
And you call it like this:
int x;
getValueOf5(&x);//I want to fill the int varaible, so I pass it's address in
//At this point x holds 5
int *p;
get1024HeapMemory(&p);//I...
Mac zip compress without __MACOSX folder?
...
It throws an error if the .DS_Store folder is not present in the archive. I suggest an improvement by adding ` || true` after each zip command (such as zip -d "$p" __MACOSX/\* || true into your answer.
– adamsfamily
...
How to avoid circular imports in Python? [duplicate]
...ew the trick putting one of the "from imports" causing the circular import error at the bottom of the module, but this is better!
– Caumons
Jul 1 '13 at 14:01
46
...
HTTP Basic Authentication - what's the expected web browser experience?
...e and curl installed. ;)
References:
https://en.wikipedia.org/wiki/Basic_access_authentication#URL_encoding
https://en.wikipedia.org/wiki/Uniform_Resource_Locator#Syntax
https://tools.ietf.org/html/rfc3986#page-18
Also according to the CURL manual page https://curl.haxx.se/docs/manual.html
HTT...
throwing exceptions out of a destructor
...ptions they will manually call the appropriate functions and processes any errors. If the user of the object is not worried (as the object will be destroyed) then the destructor is left to take care of business.
An example:
std::fstream
The close() method can potentially throw an exception.
The dest...
Insert, on duplicate update in PostgreSQL?
...ubject to race conditions that mean it might still fail with duplicate key error if a row is inserted concurrently, or might terminate with no row inserted when a row is deleted concurrently. A SERIALIZABLE transaction on PostgreSQL 9.1 or higher will handle it reliably at the cost of a very high se...
What are the mathematical/computational principles behind this game?
...d cs
legalCardSet n m = compatibleCards $ cardCandidates n m
main = mapM_ print [(n, length $ legalCardSet n m) | n<-[m..]]
where m = 8
The resulting maximum number of compatible cards for m=8 pictures per card for different number of pictures to choose from n for the first few n looks lik...
Running single test from unittest.TestCase via command line
... @TomSwirly Can't check now but I think you can do it by creatiing (empty) __init__.py inside that direcrory (and subdirs, if any) and calling eg. python test/testMyCase.py test.MyCase.testItIsHot.
– Alois Mahdal
Oct 22 '15 at 19:27
...
How do I implement __getattribute__ without an infinite recursion error?
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You get a recursion error because your attempt to access the self.__dict__ attribute inside __getattribute__ invokes your __getattribute__ again. If you use object's __getattribute__ instead, it works:
class D(object):
def __init__(self):
...
How do I run a node.js app as a background service?
...ith latest node I was unable to get it to stop an app via the script name (error) - also - generally misbehaving (was on OS-X) - all built from source, oddly. Left things in a bad state, didn't fill me with confidence.
– Michael Neale
Apr 12 '11 at 12:32
...