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Designing function f(f(n)) == -n
...oof of why such a function can't exist, for all numbers, if it doesn't use extra information(except 32bits of int):
We must have f(0) = 0. (Proof: Suppose f(0) = x. Then f(x) = f(f(0)) = -0 = 0. Now, -x = f(f(x)) = f(0) = x, which means that x = 0.)
Further, for any x and y, suppose f(x) = y. We w...
How to create a inset box-shadow only on one side?
...off. (Here is screen shot goo.gl/aO8ZX) I have try it myself and used some extra div to hide the shadow... jsfiddle.net/KFrun/19
– Fabian N.
Jul 10 '13 at 14:40
...
Why is it not advisable to have the database and web server on the same machine?
...ame thing. Switching you DB server is as easy as changing your connection string (in most cases).
– CitizenBane
Oct 5 '09 at 14:24
...
How can I get `find` to ignore .svn directories?
... set in an integer) is faster than comparing the filename (equivalent to a string comparison, which is O(n)), putting -type d before -name .svn is theoretically more efficient. However, it is usually insignificant except if you have a very very big directory tree.
– Siu Ching P...
Jenkins Git Plugin: How to build specific tag?
...all. For now, however, this solution is working for us, we just remove the extra Refspec after the job succeeds.
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Div width 100% minus fixed amount of pixels
... it is as outlined by Guffa, nested elements. It's a bit sad having to add extra markup to get the hooks you need for this, but in practice a wrapper div here or there isn't going to hurt anyone.
If you must do it without extra elements (eg. when you don't have control of the page markup), you can ...
MIME type warning in chrome for png images
... {
if(context.Request.HttpMethod == "GET")
{
string requestedFile = context.Server.MapPath(context.Request.FilePath);
FileInfo fileinfo = new FileInfo(requestedFile);
string contentType = "";
if (fileinfo.Exists && fileinfo...
Run two async tasks in parallel and collect results in .NET 4.5
...ould run in parallel.
public class Program
{
static void Main(string[] args)
{
Go();
}
public static void Go()
{
GoAsync();
Console.ReadLine();
}
public static async void GoAsync()
{
...
How to check if an object is nullable?
...t;T>(T? t) where T : struct { return true; }
}
then
static void Main(string[] args)
{
int a = 123;
int? b = null;
object c = new object();
object d = null;
int? e = 456;
var f = (int?)789;
bool result1 = ValueTypeHelper.IsNullable(a); // false
bool result2 = Val...
How to get HTTP Response Code using Selenium WebDriver
...Capabilities;
public class TestResponseCode
{
public static void main(String[] args)
{
// simple page (without many resources so that the output is
// easy to understand
String url = "http://www.york.ac.uk/teaching/cws/wws/webpage1.html";
DownloadPage(url);
...