1use std::io::{self, Write};
2
3pub struct Logger(pub Box<dyn Write>);
4
5pub fn stderr() -> Logger {
6 Logger(Box::new(io::stderr()))
7}
8
9#[macro_export]
10macro_rules! log {
11 ($l:expr) => ($l.as_ref().map(|l| l.borrow_mut().0.write("\n".as_bytes()).is_ok()));
12 ($l:expr, $fmt:expr) => (
13 $l.as_ref().map(|l| l.borrow_mut().0.write(concat!($fmt, "\n").as_bytes()).is_ok()));
14 ($l:expr, $fmt:expr, $($arg:tt)*) => (
15 $l.as_ref().map(
16 |l| l.borrow_mut().0.write_fmt(format_args!(concat!($fmt, "\n"), $($arg)*)).is_ok()));
17}