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How to count the number of set bits in a 32-bit integer?
...he expense of a 'cache miss', where the CPU has to fetch some of the table from main memory. (Look up each byte separately to keep the table small.)
If you know that your bytes will be mostly 0's or mostly 1's then there are very efficient algorithms for these scenarios.
I believe a very good gener...
How to capture the “virtual keyboard show/hide” event in Android?
...m/guide/topics/resources/runtime-changes.html#HandlingTheChange
Sample:
// from the link above
@Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
// Checks whether a hardware keyboard is available
if (newConfig.hardKeybo...
What is the main purpose of setTag() getTag() methods of View?
...nClick has only one parameter, a View, and it has to get other information from instance variables or final local variables in enclosing scopes. What we really want is to get information from the views themselves.
Enter getTag/setTag:
button1.setTag(1);
button2.setTag(2);
Now we can use the same...
How to create a CPU spike with a bash command
...
Reading from /dev/zero and writing to /dev/null is not a very good load generator - you have to run a lot of them to generate significant load. Better to do something like dd if=/dev/urandom | bzip2 -9 >> /dev/null. /dev/urand...
Are there strongly-typed collections in Objective-C?
...t;() //Error: Cannot specialize non-generic type 'GenericsTest'
Aside from than these Foundation collection classes, Objective-C lightweight generics are ignored by Swift. Any other types using lightweight generics are imported into Swift as if they were unparameterized.
Interacting with Obje...
java: HashMap not working
...
Your last example doesn't work: Cannot cast from Map<String,Integer> to Map<Integer,String>
– T3rm1
Jun 24 '13 at 8:16
...
.htaccess: Invalid command 'RewriteEngine', perhaps misspelled or defined by a module not included i
...the server configuration
Check to make sure you have mod_rewrite enabled.
From: https://webdevdoor.com/php/mod_rewrite-windows-apache-url-rewriting
Find the httpd.conf file (usually you will find it in a folder called conf, config or something along those lines)
Inside the httpd.conf file uncommen...
What are the disadvantages to declaring Scala case classes?
...'t necessarily in the contract. At least, you could explicitly exclude it from the contract when you first write the class.
– herman
Oct 6 '13 at 9:13
...
Is there a performance impact when calling ToList()?
...nsion method Enumerable.ToList() will construct a new List<T> object from the IEnumerable<T> source collection which of course has a performance impact.
However, understanding List<T> may help you determine if the performance impact is significant.
List<T> uses an array (T[...
What is the size limit of a post request?
... max_input_vars which in my version of PHP: 5.4.16 defaults to 1000. From the manual: "How many input variables may be accepted (limit is applied to $_GET, $_POST and $_COOKIE superglobal separately)" Ref.: php.net/manual/en/info.configuration.php#ini.max-input-vars
– Ni...