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585 :: Template replacement on Nimrod

• sheosi (orginal) [2014-10-12T13:55:23+02:00] view original

  As promised on the wrapper announcement post here's my first question. Urho3D uses templates for many things how I am supposed to translate that to Nimrod? I thought of using templates + emits but I don't feel that's quite right, here's an example of what I'm saying:

  GetSubsystem<Input>()
  Run

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• will (orginal) [2014-10-12T16:42:03+02:00] view original

  Check out:

  https://github.com/onionhammer/clibpp

  I believe the author wraps a templated method in their example

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• gradha (orginal) [2014-10-12T17:02:32+02:00] view original

  A C++ template is more similar in spirit to Nimrod's generics, so I would try to use that rather than template+emit when writing the Nimrod version.

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• brianrogoff (orginal) [2014-10-12T19:13:35+02:00] view original

  Interesting. How do other more advanced C++ template features map to Nim's generics/templates/macros? C++ has variadic templates, template template parameters, and templates parameterized by constants. What are the idiomatic ways to handle those kinds of things in Nim?

  I suppose that user defined typeclasses will be the way to handle concepts (which aren't in C++ yet) but I'm curious about the others.

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• sheosi (orginal) [2014-10-12T21:04:42+02:00] view original

  gradha: Thank you but, I'm not asking for replacing the functionality in Nimrod but rather to translate GetSubsystem(subsystem) to GetSubsystem<subsystem>() when compiled to C++

  will: That is not in the example, but rather in the test, however there's no way (or at least I failed to fint it out) to do that.

  brianrogoff: That's an interesting question, but on forums it's better to keep a theme/question per post, that question it's better suited for another post, or maybe other ways of communication (reddit, irc ...)

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• Demos (orginal) [2014-10-12T23:40:55+02:00] view original

  I think nimrod may let you do something like a template template parameter, technically nimrod has static[T] which allows generics parameterized by arbitrary compile time data types. Nimrod does not have variadic generics but I hear you can emulate them with macros (someone write a tutorial please :>)

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• Araq (orginal) [2014-10-13T14:16:52+02:00] view original

  proc getInputSubsystem() {.importc: "GetSubsystem<Input>", header: "foo.hpp".}

  Run

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• sheosi (orginal) [2014-10-13T14:29:07+02:00] view original

  I didnt knew importc could use C++ templates, nice now I can use that together with Nimrod templates. Thx Araq (and everyone)

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