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I know "it adds classes to your project" and "creates boiler plate code for you" but what does that actually mean? Does it do anything besides properly generate your .h and .cpp files for you?

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I've never used UE4 but I've used UE3.

And yes by reading at the documentation, I believe it indeed does more than setting up two files with boilerplate code. Quotation:

This converts a content-only project into a code project.

That should mean:

  • Creating a Visual Studio or Xcode solution for the generation of user DLLs,
  • Preparing it for compilation (c.f. this page),
  • Maybe some messing up with the Unreal game project and its packaging, as the game will now run those custom DLLs instead (on top?) of the stock ones.

Probably more, but you get the idea.

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It adds 'boiler plate' code to your project, based on what have you choosen. By doing this you are converting your content-only project to code project and that means that you can build it from Visual Studio/Xcode, and it will also slow down the building process. You can use the classes you have written in C++ in Blueprints, too.

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