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What does an exclamation mark mean in the Swift language?

...? As far as I can work out (this is very new to me, too)... The term "wrapped" implies we should think of an Optional variable as a present, wrapped in shiny paper, which might (sadly!) be empty. When "wrapped", the value of an Optional variable is an enum with two possible values (a little like...
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From inside of a Docker container, how do I connect to the localhost of the machine?

...port DOCKER_HOST_IP=$(route -n | awk '/UG[ \t]/{print $2}') then in your application, use the DOCKER_HOST_IP environment variable to open the connection to MySQL. Note: if you use bind-address = 0.0.0.0 your MySQL server will listen for connections on all network interfaces. That means your MySQL...
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overlay two images in android to set an imageview

I am trying to overlay two images in my app, but they seem to crash at my canvas.setBitmap() line. What am I doing wrong? ...
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How to find out client ID of component for ajax update/render? Cannot find component with expression

...ding on the current naming container. See following chapter. Note: if it happens to contain iteration index like :0:, :1:, etc (because it's inside an iterating component), then you need to realize that updating a specific iteration round is not always supported. See bottom of answer for more detai...
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Comparison of Android networking libraries: OkHTTP, Retrofit, and Volley [closed]

... to batch callbacks to the main thread to reduce context switching. Volley apparently has futures, too. Check out RequestFuture if you’re interested. If you’re dealing with high-resolution compressed images, Volley is the only solution here that works well. Volley can be used with Okhttp (New ve...
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When should I use OWIN Katana?

...ut OWIN, the asp.net bits are coupled to the way IIS communicates with the application. OWIN abstracts web servers and framework components. That means that your application code will now be aware of the OWIN interface, but not of the webserver that is serving the request. In return, applications c...
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How Python web frameworks, WSGI and CGI fit together

...embeds Python inside Apache; no process is forked. Apache runs the Django application directly. Daemon mod_wsgi or mod_fastcgi allows Apache to interact with a separate daemon (or "long-running process"), using the WSGI protocol. You start your long-running Django process, then you configure Apach...
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How can I add (simple) tracing in C#? [closed]

I want to introduce some tracing to a C# application I am writing. Sadly, I can never really remember how it works and would like a tutorial with reference qualities to check up on every now and then. It should include: ...
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Tomcat VS Jetty [closed]

... I think tomcat is more disscussed and supported by application, Jetty is portable and can be embedded in an application. and Jetty has good continuations. share | improve thi...
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Executing command line programs from within python [duplicate]

I'm building a web application that will is going to manipulate (pad, mix, merge etc) sound files and I've found that sox does exactly what I want. Sox is a linux command line program and I'm feeling a little uncomfortable with having the python web app starting new sox processes on my server on a...