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Do I cast the result of malloc?
... someone suggested in a comment that I should not cast the result of malloc , i.e.
29 Answers
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Sleep for milliseconds
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Note that there is no standard C API for milliseconds, so (on Unix) you will have to settle for usleep, which accepts microseconds:
#include <unistd.h>
unsigned int microseconds;
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usleep(microseconds);
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Thread Safety in Python's dictionary
...de should be safe. Keep in mind: a lock here will add almost no overhead, and will give you peace of mind.
http://effbot.org/pyfaq/what-kinds-of-global-value-mutation-are-thread-safe.htm has more details.
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How to send a simple string between two programs using pipes?
I tried searching on the net, but there are hardly any resources. A small example would suffice.
7 Answers
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Convert from List into IEnumerable format
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You can use the extension method AsEnumerable in Assembly System.Core and System.Linq namespace :
List<Book> list = new List<Book>();
return list.AsEnumerable();
This will, as said on this MSDN link change the type of the List in compile-time.
This will give you the benefits also...
Setting variable to NULL after free
... int *nPtr=NULL;. Now, I would agree that this would be redundant, with a malloc following right in the next line. However, if there is code between the declaration and the first initialization, somebody might start using the variable even though it has no value yet. If you null-initialize, you get ...
How do I 'overwrite', rather than 'merge', a branch on another branch in Git?
...(git commit-tree -m "Throw away branch 'A'" -p A -p B B^{tree})
This basically acts like the (non-existent) merge -s theirs strategy.
You can find the resulting history in the plumbing branch of the demo repository
Not very readable and not as easy to remember compared to the -s ours switch, but it...
How to export query result to csv in Oracle SQL Developer?
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@topr Use method 1, then select all, copy and paste into a text editor and save as csv. You might even be able to paste directly into Excel, but I'm not sure about that.
– Travis
Jan 3 '14 at 20:08
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max value of integer
...hine to machine, on embedded systems the int can be 16 bit wide, though usually it is 32 bit.
The only requirement is that short int <= int <= long int by size. Also, there is a recommendation that int should represent the native capacity of the processor.
All types are signed. The unsigned...
How do you execute an arbitrary native command from a string?
...her path\file.ext"'
iex "& $command"
Likely, you could handle nearly all cases by detecting if the first character of the command string is ", like in this naive implementation:
function myeval($command) {
if ($command[0] -eq '"') { iex "& $command" }
else { iex $command }
}
But...