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Why does GCC generate 15-20% faster code if I optimize for size instead of speed?
... gcc-4.8.1 0.708s 0.944s -O2
Intel Core i7-4770K gcc-4.8.1 0.296s 0.288s -Os
Intel Atom 330 gcc-4.8.1 2.003s 2.007s -O2
ARM 1176JZF-S (Broadcom BCM2835) gcc-4.6.3 3.470s 3.480s -O2
ARM...
Forward an invocation of a variadic function in C
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If you don't have a function analogous to vfprintf that takes a va_list instead of a variable number of arguments, you can't do it. See http://c-faq.com/varargs/handoff.html.
Example:
void myfun(const char *fmt, va_list argp) {
vfprintf(stderr, fmt, argp);
}
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In C#, how can I create a TextReader object from a string (without writing to disk)
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Will iOS launch my app into the background if it was force-quit by the user?
I am triggering a background fetch by using the content-available flag on a push notification. I have the fetch and remote-notification UIBackgroundModes enabled.
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deciding among subprocess, multiprocessing, and thread in Python?
I'd like to parallelize my Python program so that it can make use of multiple processors on the machine that it runs on. My parallelization is very simple, in that all the parallel "threads" of the program are independent and write their output to separate files. I don't need the threads to exchan...
How do I comment on the Windows command line?
In Bash, # is used to comment the following. How do I make a comment on the Windows command line?
7 Answers
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How to find out which processes are using swap space in Linux?
...ot possible to get the exact size of used swap space of a
process. Top fakes this information by making SWAP = VIRT - RES, but
that is not a good metric, because other stuff such as video memory
counts on VIRT as well (for example: top says my X process is using
81M of swap, but it also repo...
SELECT * WHERE NOT EXISTS
I think I'm going down the right path with this one... Please bear with me as my SQL isn't the greatest
5 Answers
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Xcode find caller functions
... has this functionality. when you highlight say... a function, you can check the "caller" and "callee"
edit i believe it's located at the top left of the file panel for that file... so double click on the function to highlight it, and you click on on the file panel options (the one that has the "op...
Convert stdClass object to array in PHP
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The easiest way is to JSON-encode your object and then decode it back to an array:
$array = json_decode(json_encode($object), true);
Or if you prefer, you can traverse the object manually, too:
foreach ($object as $value)
$array[] = $value->post_id;
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