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What is std::promise?
... via the member function get(), which effectively synchronizes the program by waiting for the result. Alternatively, a future supports wait_for(), which can be used to probe whether or not the result is already available. Futures should be thought of as the asynchronous drop-in replacement for...
Quit and restart a clean R session from within R?
... This solution works but is not reproducible when my script is run by others. Is there a command to be included in R script to restart R session? (the reason being I want all packages to be detached)
– Heisenberg
Oct 19 '14 at 20:04
...
find all unchecked checkbox in jquery
...
You can do so by extending jQuerys functionality. This will shorten the amount of text you have to write for the selector.
$.extend($.expr[':'], {
unchecked: function (obj) {
return ((obj.type == 'checkbox' || obj.type...
Debug a java application without starting the JVM with debug arguments
...stances of the software are no configured to launch with jvm debug options by default so we can use the supported method.
– hhafez
Aug 24 '12 at 21:16
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Configuring Log4j Loggers Programmatically
...d through other appenders in other categories (unless configured otherwise by setting the additivity flag).
If you need to know how logging works and how is decided where logs are written read this manual for more infos about that.
In Short:
Logger fizz = LoggerFactory.getLogger("com.fizz")
...
What is DOCTYPE?
...the differences in rendering when using various DOCTYPEs. XHTML is enabled by certain DOCTYPEs, and there is quite a bit of debate about the use of XHTML which is covered well in XHTML — myths and reality.
There are subtle differences between different "standards compliant" rendering DOCTYPEs...
Show or hide element in React
... );
}
});
ReactDOM.render( <Search /> , document.getElementById('container'));
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.6.2/react.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react-dom/15.6.2/react-dom.min.js"></scri...
socket.error: [Errno 48] Address already in use
...for local files.
The second number is the process number; stop the server by sending it a signal:
kill 81651
This sends a standard SIGTERM signal; if the process is unresponsive you may have to resort to tougher methods like sending a SIGKILL (kill -s KILL <pid> or kill -9 <pid>) sig...
Disable copy constructor
...s I think the time spent following this pattern is greater than time saved by the errors it prevents. I simply forbid copy whenever not sure.
– Tomáš Zato - Reinstate Monica
Jan 14 '16 at 9:37
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PHP 5: const vs static
...where via ClassName::$variable.
protected static variables can be accessed by the defining class or extending classes via ClassName::$variable.
private static variables can be accessed only by the defining class via ClassName::$variable.
Edit: It is important to note that PHP 7.1.0 introduced su...