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Showing posts from December, 2016

How to fix the Unbound module Graphics in an ocaml project

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From ~/pr/gitl/ocaml-gol In a constant effort to learn new programming languages, I'm currently trying to use ocaml , a free and open-source general-purpose, multi-paradigm programming language maintained at the Inria . It's basically an extension of Caml with object-oriented features. I'm mostly interested by its functionnal and pattern matching features but the module part of the language can be a bit difficult to understand for someone with little to none ML (Meta Language) background.   The error When trying to use the graphics module to create a graphical window and go just a little further than the simplest helloworld program, here is the result : If the project uses dune : (executable (name ocaml_project) (libraries lwt.unix graphics) ) with this code : let () = Printf.printf "Hello, world!\n";; Lwt_io.printf "Hello, world!\n";; Graphics.open_graph " 800x600";; The first times I built this project running the du

How to make a map of variant in C++

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This code is used by RainbruRPG to store any scalar types in a single class instance. It's already in use since  revision 254  to save game states values when switching fullscreen or changing screen resolution. The map class It's basically a map of boost::variant using std::string as map key. I decided to use function template setter and getter to have a standardized exception-based error handling, but you could have multiple parameter-based specialized getter/setter ( void set(bool) , void set(int) ...).