[Vala] Construct exceptions from numeric error codes

[Sandino Flores Moreno <tigrux gmail com>]

Hello.

Is there a way to construct a throwable error instance from an error code?

I want to implement something like this:

  void try_run(int err_code) throws GLib.Error {
      if (err_code != 0)
          throw new GLib.Error (Quark.from_string ("My Error"),
err_code, err_desc (err_code));
  }

It would be invoked as follows:

  try {
    try_run ( one_command ());
    try_run ( another_command ());
    ...
  }
  except (Error e) {
   ...
  }

This is because I'm wrapping an non-glib API that reports its errors
using return values,
and I want to construct GLib Exceptions from those values.

However, Vala does not allow me to launch plain GLib.Error instances.

How to work around it?

Thanks.