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When would you use delegates in C#? [closed]
...e delegate's invocation.
public class DataProvider
{
protected string _connectionString;
public DataProvider( string psConnectionString )
{
_connectionString = psConnectionString;
}
public void UseReader( string psSELECT, DataReaderUser readerUser )
{
using...
Why no generics in Go?
...to its concrete type. Get the gritty details here: golang.org/ref/spec#Type_assertions
– tbone
Aug 25 '13 at 20:50
...
What is the difference between “def” and “val” to define a function
...ion every time (new instance of Function1).
def even: Int => Boolean = _ % 2 == 0
even eq even
//Boolean = false
val even: Int => Boolean = _ % 2 == 0
even eq even
//Boolean = true
With def you can get new function on every call:
val test: () => Int = {
val r = util.Random.nextInt
...
In log4j, does checking isDebugEnabled before logging improve performance?
... running at log level of INFO or ERROR
– AztecWarrior_25
Mar 10 '18 at 0:51
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How to install latest version of git on CentOS 7.x/6.x
... repo package:
yum install http://opensource.wandisco.com/centos/6/git/x86_64/wandisco-git-release-6-1.noarch.rpm
- or -
yum install http://opensource.wandisco.com/centos/7/git/x86_64/wandisco-git-release-7-1.noarch.rpm
- or -
yum install http://opensource.wandisco.com/centos/7/git/x86_64/wandisco-...
what is reverse() in Django
...t's suppose that in your urls.py you have defined this:
url(r'^foo$', some_view, name='url_name'),
In a template you can then refer to this url as:
<!-- django <= 1.4 -->
<a href="{% url url_name %}">link which calls some_view</a>
<!-- django >= 1.5 or with {% load ur...
NSRange to Range
...nd 2, so depending on which Swift you're using:
Swift 3.0
func textField(_ textField: UITextField,
shouldChangeCharactersIn range: NSRange,
replacementString string: String) -> Bool {
let nsString = textField.text as NSString?
let newString = nsString?.replaci...
Oracle TNS names not showing when adding new connection to SQL Developer
...g location in this order for a tnsnames.ora file
$HOME/.tnsnames.ora
$TNS_ADMIN/tnsnames.ora
TNS_ADMIN lookup key in the registry
/etc/tnsnames.ora ( non-windows )
$ORACLE_HOME/network/admin/tnsnames.ora
LocalMachine\SOFTWARE\ORACLE\ORACLE_HOME_KEY
LocalMachine\SOFTWARE\ORACLE\ORACLE_HOME
To see...
What happens to a detached thread when main() exits?
...), and that's well-defined, as long as it touches neither (automatic|thread_local) variables of other threads nor static objects.
This appears to be allowed to allow thread managers as static objects (note in [basic.start.term]/4 says as much, thanks to @dyp for the pointer).
Problems arise when t...
How can I implement an Access Control List in my Web MVC application?
... protected $target = null;
protected $acl = null;
public function __construct( $target, $acl )
{
$this->target = $target;
$this->acl = $acl;
}
public function __call( $method, $arguments )
{
if (
method_exists( $this->target, $...