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What is the advantage of GCC's __builtin_expect in if else statements?
...t? Let's find out!
Without __builtin_expect
#include "stdio.h"
#include "time.h"
int main() {
/* Use time to prevent it from being optimized away. */
int i = !time(NULL);
if (i)
puts("a");
return 0;
}
Compile and decompile with GCC 4.8.2 x86_64 Linux:
gcc -c -O3 -std=gn...
How do lexical closures work?
...
s/at compile time/at the moment when def statement is executed/
– jfs
Oct 25 '08 at 17:01
23
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Do interfaces inherit from Object class in java
... that you have a class that is a subtype of employee.
The JVM will do runtime checking for your code (i.e. throw NullPointerException).
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JavaScript before leaving the page
... Is there anyway to know when it is refresh vs when its first time?
– Si8
Jan 13 '17 at 0:00
When a user ...
Android Fragment lifecycle over orientation changes
...tivity when it's recreated. This is a massive pain in the rear most of the time.
You can stop errors occurring by using the same Fragment rather than recreating a new one. Simply add this code:
if (savedInstanceState == null) {
// only create fragment if activity is started for the first time
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Fast stable sorting algorithm implementation in javascript
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Note: Array#shift may workn in O(n) time and so your merge in O(n*n).
– 4esn0k
Mar 14 '16 at 4:58
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How to display hidden characters by default (ZERO WIDTH SPACE ie. ​)
... in View -> Active Editor -> Show WhiteSpaces.
Edit:
Had some free time since it looks like a popular issue, I had written a plugin to inspect the code for such abnormalities. It is called Zero Width Characters locator and you're welcome to give it a try.
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Find all tables containing column with specified name - MS SQL Server
...N ('YOUR_SCHEMA_NAME');
SIMPLE AS THAT!! (SQL, PL/SQL)
I use it ALL the time to find ALL instances of a column name in a given database (schema).
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HTML5 Canvas 100% Width Height of Viewport?
...f your canvas, but then you'll have to repaint everything, which will take time and is not always necessary, because some amount of size change you can accomplish via the css attributes, in which case you do not redraw the canvas.
I see 4 cases of what you might want to happen on window resize (all...
Detecting which UIButton was pressed in a UITableView
... targets and actions, so the method checkButtonTapped: will be called many times when you click the button. You'd better remove the target and action before adding them
– bandw
Nov 30 '14 at 19:43
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