Hot code reloading

  1. // live
  2. module main
  4. import time
  6. [live]
  7. fn print_message() {
  8.     println('Hello! Modify this message while the program is running.')
  9. }
  11. fn main() {
  12.     for {
  13.         print_message()
  14.         time.sleep(500 * time.millisecond)
  15.     }
  16. }

Build this example with v -live message.v.

You can also run this example with v -live run message.v. Make sure that in command you use a path to a V’s file, not a path to a folder (like v -live run .) - in that case you need to modify content of a folder (add new file, for example), because changes in message.v will have no effect.

Functions that you want to be reloaded must have [live] attribute before their definition.

Right now it’s not possible to modify types while the program is running.

More examples, including a graphical application: github.com/vlang/v/tree/master/examples/hot_reload.