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Why covariance and contravariance do not support value type
...or not.
You might want to read Eric Lippert's blog post on representation and identity for more on this topic in general.
EDIT: Having reread Eric's blog post myself, it's at least as much about identity as representation, although the two are linked. In particular:
This is why covariant and ...
How can I run PowerShell with the .NET 4 runtime?
...rShell (the engine) runs fine under .NET 4.0. PowerShell (the console host and the ISE) do not, simply because they were compiled against older versions of .NET. There's a registry setting that will change the .NET framework loaded systemwide, which will in turn allow PowerShell to use .NET 4.0 cla...
Java packages com and org
What are the meaning of the packages org and com in Java?
4 Answers
4
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“Cloning” row or column vectors
... into a 2D array with length 1 in the first axis (vertical on your screen) and length 3 in the second axis (horizontal on your screen). Transposing then makes it have length 3 in the first axis and length 1 in the second axis. A tile shape of (1, 3) copies this column over three times, which is why ...
Boolean vs boolean in Java
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Yes you can use Boolean/boolean instead.
First one is Object and second one is primitive type.
On first one, you will get more methods which will be useful.
Second one is cheap considering memory expense The second will save you a lot more memory, so go for it
Now choose your way....
How to convert an int to string in C?
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EDIT: As pointed out in the comment, itoa() is not a standard, so better use sprintf() approach suggested in the rivaling answer!
You can use itoa() function to convert your integer value to a string.
Here is an example:
int num = 321;
char snum[5];
// convert 123 to string...
Passing parameters to JavaScript files
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I'd recommend not using global variables if possible. Use a namespace and OOP to pass your arguments through to an object.
This code belongs in file.js:
var MYLIBRARY = MYLIBRARY || (function(){
var _args = {}; // private
return {
init : function(Args) {
_args = A...
How do you detect Credit card type based on number?
...gy in some documents). These six digits are subject to an international standard, ISO/IEC 7812, and can be used to determine the type of card from the number.
Unfortunately the actual ISO/IEC 7812 database is not publicly available, however, there are unofficial lists, both commercial and free, in...
Is there a way of setting culture for a whole application? All current threads and new threads?
...here a way of setting culture for a whole application? All current threads and new threads?
10 Answers
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Quickly create a large file on a Linux system
...her answers is a good solution, but it is slow for this purpose. In Linux (and other POSIX systems), we have fallocate, which uses the desired space without having to actually writing to it, works with most modern disk based file systems, very fast:
For example:
fallocate -l 10G gentoo_root.img
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