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How do the likely/unlikely macros in the Linux kernel work and what is their benefit?
...it determines it will take the branch, then it has to invalidate that, and start at the branch target.
Most modern processors now have some sort of branch prediction, but that only assists when you've been through the branch before, and the branch is still in the branch prediction cache.
There are...
Listing all extras of an Intent
...<String> it = keys.iterator();
Log.e(LOG_TAG,"Dumping Intent start");
while (it.hasNext()) {
String key = it.next();
Log.e(LOG_TAG,"[" + key + "=" + bundle.get(key)+"]");
}
Log.e(LOG_TAG,"Dumping Intent end");
}
}
...
How do you comment out code in PowerShell?
...
Single line comments start with a hash symbol, everything to the right of the # will be ignored:
# Comment Here
In PowerShell 2.0 and above multi-line block comments can be used:
<#
Multi
Line
#>
You could use block comments t...
Android ACTION_IMAGE_CAPTURE Intent
...ap image. However, if we putExtra(EXTRA_OUTPUT,...) on the intent before starting it, everything works until you try to hit the "Ok" button in the camera app. The "Ok" button just does nothing. The camera app stays open and nothing locks up. We can cancel out of it, but the file never gets written...
Deep null checking, is there a better way?
...
Update: Starting with Visual Studio 2015, the C# compiler (language version 6) now recognizes the ?. operator, which makes "deep null checking" a breeze. See this answer for details.
Apart from re-designing your code, like
this del...
SELECT INTO Variable in MySQL DECLARE causes syntax error?
...
yes, in a stored procedure variables don't have to start with @. But, it is easier to demonstrate that way.
– Garr Godfrey
Jul 26 '17 at 19:29
add a co...
PHP Fatal error: Call to undefined function json_decode()
...pending on the PHP version you're running)
Then of course make sure you restart Apache:
sudo service apache2 restart
Or if you are using PHP-FPM:
sudo service php7.2-fpm restart
(Or php7.1-fpm or php5-fpm)
Explanation
Debian has removed the previous JSON extension as of PHP 5.5rc2 due to a ...
How to run a background task in a servlet based web application?
...c void someDailyJob() {
// Do your job here which should run every start of day.
}
@Schedule(hour="*/1", minute="0", second="0", persistent=false)
public void someHourlyJob() {
// Do your job here which should run every hour of day.
}
@Schedule(hour="*", minute=...
Open soft keyboard programmatically
... the <activity> that you want to show the keyboard when the activity starts:
android:windowSoftInputMode="stateVisible"
This should cause the keyboard to become visible when the activity starts.
For more options, checkout the documentation.
...
Python “SyntaxError: Non-ASCII character '\xe2' in file”
...racter, this table is useful. Everything in the "UTF-8 Bytes" column which starts with %E2 is a candidate. Generally the issue is editing code with "smart" features turned on like "smart quotes" replacing " with “ (U+201C) and ” (U+201D) or turning -- into — (U+2014 em dash). All of those star...