backwards-compatibility

TLDR: How do I create WCF services that are backward compatible -- that is, when I deploy a new version of the service on the server-side, all the clients on the older versions can still use the service. I'm creating a web service that will allow the client applications to fetch a listing of plugins. I will at least have one operation like FindPlugins(string nameOrDescription) which will, on the server, do a search and return a list of objects. Unfortunately, I cannot guarantee that my clients will all be updated with each new release of my service; nay, I am sure that many of them will be

Now that Visual Studio 2015 RC is out, has anyone installed it and opened Visual Studio 2013 projects/solutions? Does it ask the files to be changed? If yes, are the changes it makes backward compatible? Take a look at the Porting, Migrating, and Upgrading Visual Studio Projects article for Visual Studio 2015. All of the various caveats are described there. Kenneth Li Not all types of project are supported. I tried the following 4 project types: Vb.net Class project, OK. Vb.net Web Services project, OK. Cordova JS project, not OK, need to migrate manually, by moving the sources from root

My app lets the user select images and then it animates the images. It's a simple thing and I want it to run on 4.2 and onwards. It works perfectly now. The app is supposed to remember the chosen images and let these be default the next time the user runs the app - when the app is restarted. This works beautifully on my Galaxy Nexus (4.2.1) but not so well on my Galaxy S8+ (7.0). Since I love how it works on 4.2.1, it's a bit frustrating that it can't simply run the same on later platforms. This is inside onCreate() : ((ImageButton) findViewById(R.id.imagex)) .setOnClickListener(new View

I'm trying to get a Mathematica example working. It's the one on Theo Gray's blog . I think that Mathematica must have changed since he wrote that code (May 2008), since I'm unable to get anything reasonable out of it, despite changing nearly everything. Do I use ImageData instead of Import? Can anyone suggest a version of this code that works for Mathematica 8? imagePool = Map[With[{i = Import[#]}, {i, Mean[Flatten[N[i[[1, 1]]], 1]]}] &, FileNames["Pool/*.jpg"]]; closeMatch[c_] := RandomChoice[Take[SortBy[imagePool, Norm[c - #[[2]]] &], 20]][[1]]; Grid[Reverse[ Map[closeMatch, Import[

I would like to write an app which can be run on iOS 3.1.3 up to iOS 4.1. I know how to set up the deployment target and the base SDK. After reading the Apple docs it heavily relies on checking if the class is available and/or if an instance responds to a specific selector. Now my questions: What happens if Apple made a class public from 3.1.3 to 4.x ? When just checking for the class name it would be available on iOS 3.1.3, too? So on this version I would be using a private API, which I do not want. How would you check that? Is this really a problem or am I worrying too much? Would you also

I'm using g++ 4.4 to compile a shared library on linux. I would like to use some C++11 features if I can in the library, but I cannot update the version of the compiler or require any special compiler switches for users of my library. I have two questions and I'm having trouble finding a definitive answer. If I compile a shared library with -std=c++0x or -std=g++0x, am I guaranteed that a program that uses my library doesn't need those switches (provided I have no c++0x features in the header files)? It seems to work, but I don't want to be signing up for subtle problems down the road. The