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Double Negation in C++
...actually a very useful idiom in some contexts. Take these macros (example from the Linux kernel). For GCC, they're implemented as follows:
#define likely(cond) (__builtin_expect(!!(cond), 1))
#define unlikely(cond) (__builtin_expect(!!(cond), 0))
Why do they have to do this? GCC's __builtin_...
Can you center a Button in RelativeLayout?
... how to manipulate things to do what I want. Basically I want to stay away from aligning things with pixels because the picture could look very different on a different screen type/resolution. However, when you use the gravity command, everything follows it. I tried disabling gravity for a button by...
Redis strings vs Redis hashes to represent JSON: efficiency?
...sh-max-ziplist-value, hash-max-ziplist-entries ) And breaking under a hood from a hash options IS REALLY BAD, because each usual key/value pair inside Redis use +90 bytes per pair.
It means that if you start with option two and accidentally break out of max-hash-ziplist-value you will get +90 bytes...
PHP-FPM doesn't write to error log
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I gathered insights from a bunch of answers here and I present a comprehensive solution:
So, if you setup nginx with php5-fpm and log a message using error_log() you can see it in /var/log/nginx/error.log by default.
A problem can arise if you...
JavaScript listener, “keypress” doesn't detect backspace?
...e backspace key only fires a keydown event but the character isn't removed from the input until sometime after that.
– jxmallett
Apr 15 '15 at 0:24
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How to git clone a specific tag
From git-clone(1) Manual Page
5 Answers
5
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How to get my IP address programmatically on iOS/macOS?
...ddress and type-casting it to IPv4 and turning that to a string (basically from the high 32 bits of the 128-bit address.)
– Jens Alfke
Oct 9 '13 at 21:16
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Javascript shorthand ternary operator
...d ambiguity, I have replaced my original detailed explanation with the one from Mozilla Developer Network. It should be less ambiguous.
– Tadeck
Jan 16 '12 at 18:00
add a comm...
What is the “owning side” in an ORM mapping?
...de necessary:
The idea of a owning side of a bidirectional relation comes from the fact that in relational databases there are no bidirectional relations like in the case of objects. In databases we only have unidirectional relations - foreign keys.
What is the reason for the name 'owning side'?
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Easy way to see saved NSUserDefaults?
...for an already installed application? My client downloaded the application from the appstore, and something is wrong. I need to check the NSUserDefaults file
– Dejell
Mar 12 '13 at 8:21
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