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What is the string length of a GUID?
...ore it as uniqueidentifier - this is then fully indexable, etc. at the database. The next-best option would be a binary(16) column: standard GUIDs are exactly 16 bytes in length.
If you must store it as a string, the length really comes down to how you choose to encode it. As hex (AKA base-16 encod...
Why do we need virtual functions in C++?
... you're assigning the subclassed object (Cat), the method being invoked is based on the pointer type (Animal) not the type of object it is point to. This is why you need "virtual".
– rexbelia
Feb 7 '16 at 4:08
...
top -c command in linux to filter processes listed based on processname
...on -u but I am wondering if there is any easy way to filter the processes based on processname listed under COMMAND column of the top output.
...
Xml configuration versus Annotation based configuration [closed]
...d they are, but I would argue that leaving the mapping of beans to the database in XML is also good, as the object shouldn't care where its information came from, it should just care what it can do with its information. But if you like JPA (I don't have any expirience with it), by all means, go for...
Best way to use PHP to encrypt and decrypt passwords? [duplicate]
...PT_RIJNDAEL_128, MCRYPT_MODE_CBC),
MCRYPT_DEV_URANDOM
);
$encrypted = base64_encode(
$iv .
mcrypt_encrypt(
MCRYPT_RIJNDAEL_128,
hash('sha256', $key, true),
$string,
MCRYPT_MODE_CBC,
$iv
)
);
To Decrypt:
$data = base64_decode($encrypted);
$i...
Finding the type of an object in C++
... a bad_cast exception.
Make sure there is at least one virtual function in Base class to make dynamic_cast work.
Wikipedia topic Run-time type information
RTTI is available only for classes that are polymorphic, which means
they have at least one virtual method. In practice, this is not a
limitatio...
Python: split a list based on a condition?
...om a performance perspective, to split a list of items into multiple lists based on a conditional? The equivalent of:
34 An...
how to convert binary string to decimal?
...converts strings to numbers, and it takes a second argument specifying the base in which the string representation is:
var digit = parseInt(binary, 2);
See it in action.
share
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improve this answ...
Why can't I have abstract static methods in C#?
...oment, inherit static methods. Imagine this scenario:
public static class Base
{
public static virtual int GetNumber() { return 5; }
}
public static class Child1 : Base
{
public static override int GetNumber() { return 1; }
}
public static class Child2 : Base
{
public static override ...
How can I get Visual Studio 2008 Windows Forms designer to render a Form that implements an abstract
...rom this code to the problem
Form1 : Form
Problem
public class Form1 : BaseForm
...
public abstract class BaseForm : Form
This is where the initial question came into play. As said before, a friend pointed out that System.Windows.Forms.Form implements a base class that is abstract. We were a...