[Question] Are Manifold String Templates evaluated lazily?

[EotT123]

Are String Templates evaluated eagerly or lazily? When using logging statements with traditional replacements, lazy evaluation is beneficial because the evaluation depends on the logging level.

[rsmckinney]

A String template evaluates eagerly. There is no other way since there is a single expression that must evaluate to a String value.

Of course, you can add your own laziness.

String pet = "dog";
logger.debug("{}", message(()-> "my $pet has fleas"));
. . .
Object message(Supplier<String> msg) {
  return new Object() {
    public String toString() {
      return msg.get();
    }
  };
}

Would be a good idea to add nicer extension methods to your logger class if you did go this route, so you could write:

logger.debug(()-> "my $pet has fleas");

[EotT123]

Thanks for the suggestion!