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How does deriving work in Haskell?
... to integrate a new generic deriving mechanism as described in this paper: http://www.dreixel.net/research/pdf/gdmh.pdf
For more on this, see:
GHC wiki: http://hackage.haskell.org/trac/ghc/wiki/Commentary/Compiler/GenericDeriving
Haskell wiki: http://www.haskell.org/haskellwiki/Generics
Hackage: ...
Difference between solr and lucene
...library, not just Solr.
3) Solr is built around Lucene. It is not just an http-wrapper around Lucene but has been known to add more arsenal to Lucene. Solr is ready-to-use out of box. It is a web application that offers related infrastructure and a lot more features in addition to what Lucene offer...
Passing Parameters JavaFX FXML
...ch is still valid and tested in March 2016, on Spring Boot v1.3.3.RELEASE:
https://stackoverflow.com/a/36310391/1281217
Sometimes, you might want to pass results back to the caller, in which case you can check out the answer to the related question:
JavaFX FXML Parameter passing from Controller A ...
C# How can I check if a URL exists/is valid?
...
// fine, no content downloaded
string s1 = client.DownloadString("http://google.com");
// throws 404
string s2 = client.DownloadString("http://google.com/silly");
}
You would try/catch around the DownloadString to check for errors; no error? It exists...
With C# 2.0 (VS2005):
...
How to get a file or blob from an object URL?
...the best/only way to do this is with an async xhr2 call:
var xhr = new XMLHttpRequest();
xhr.open('GET', 'blob:http%3A//your.blob.url.here', true);
xhr.responseType = 'blob';
xhr.onload = function(e) {
if (this.status == 200) {
var myBlob = this.response;
// myBlob is now the blob that th...
What is the opposite of :hover (on mouse leave)?
...and chrome */
}
ul li a:hover {
color:black;
cursor: pointer;
}
http://jsfiddle.net/spacebeers/sELKu/3/
The definition of hover is:
The :hover selector is used to select elements when you mouse over
them.
By that definition the opposite of hover is any point at which the mouse is...
how to read System environment variable in Spring applicationContext
...to.my.BeanClass">
<!-- can be overridden with -Dtest.target.host=http://whatever.com -->
<constructor-arg value="#{systemProperties['test.target.host'] ?: 'http://localhost:18888'}"/>
</bean>
sh...
PHP best way to MD5 multi-dimensional array?
...ference. You may see the results of the test with this live script here:
http://nathanbrauer.com/playground/serialize-vs-json.php
http://nathanbrauer.com/playground/plain-text/serialize-vs-json.php
Now, one thing to note is array(1,2,3) will produce a different MD5 as array(3,2,1). If this is N...
Loadbalancing web sockets
... a 2 core, 4GB RAM VM.
Also note that you can do L7 load-balancing on the HTTP path announced during the initial WebSocket handshake. In that case the load balancer has to maintain state (which source IP-port pair is going to which backend node). It will probably scale to millions of connections ne...
Changing user agent on urllib2.urlopen
... User-Agent header, which is used by a browser to identify itself – some HTTP servers only allow requests coming from common browsers as opposed to scripts. For example, Mozilla Firefox may identify itself as "Mozilla/5.0 (X11; U; Linux i686) Gecko/20071127 Firefox/2.0.0.11", while urllib2‘s def...