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Scalar vs. primitive data type - are they the same thing?
...to types that are built into to the language, as opposed to being provided by a library (even a standard library), regardless of how they're implemented. Perl strings are part of the Perl language, so they are native in Perl. C provides string semantics over pointers to chars using a library, so poi...
How to set an environment variable only for the duration of the script?
... For example, in a shell script, making an app that saves to HOME portable by temporarily setting HOME to a folder in the present working directory, and then launching the app.
...
How find all unused classes in Intellij Idea?
... OK
Settings closes
On the menu bar, click on Analyze / Run Inspection by Name (or Ctrl+Alt+Shift+I - in Mac Command+Option+Shift+I)
Insert text "Unused decla"
Select "Unused declaration Java|Declaration redundancy"
Search starts
Check the job state on bottom of Idea, when finished: enjoy ...
Large Numbers in Java
...ng the (though obvious for most, I guess) inherit performance hit incurred by the use of the BigInteger class if you plan to do calculations with that.
– haylem
Feb 29 '12 at 0:43
...
Formatting “yesterday's” date in python
...
To expand on the answer given by Chris
if you want to store the date in a variable in a specific format, this is the shortest and most effective way as far as I know
>>> from datetime import date, timedelta
>>> yeste...
How to have comments in IntelliSense for function in Visual Studio?
...is xml comments - basically, they follow this syntax (as vaguely described by Solmead):
C#
///<summary>
///This is a description of my function.
///</summary>
string myFunction() {
return "blah";
}
VB
'''<summary>
'''This is a description of my function.
'''</summary&g...
std::auto_ptr to std::unique_ptr
....
Function scope variable:
100% compatible, as long as you don't pass it by value to another function.
Return type:
not 100% compatible but 99% compatible doesn't seem wrong.
Function parameter by value:
100% compatible with one caveat, unique_ptrs must be passed through a std::move call. This on...
Unicode, UTF, ASCII, ANSI format differences
...uses it to refer to whichever Unicode encoding that particular system uses by default. On Windows and Java, this often means UTF-16; in many other places, it means UTF-8. Properly, Unicode refers to the abstract character set itself, not to any particular encoding.
UTF-16: 2 bytes per "code unit"....
Django Admin - Disable the 'Add' action for a specific model
...
By default syncdb creates 3 security permissions for each model:
Create (aka add)
Change
Delete
If your logged in as Admin, you get EVERYTHING no matter what.
But if you create a new user group called "General Access" (f...
Database cluster and load balancing
...all a cluster a set of replicated servers.
Replication defines the method by which a set of servers remain synchronized without having to share the storage being able to be geographically disperse, there are two main ways of going about it:
master-master (or multi-master) replication: Any server ...