use std::time::Instant;

pub struct ScopeTimer {
    #[allow(dead_code)]
    start: Instant,
    #[allow(dead_code)]
    name: &'static str,
}

impl ScopeTimer {
    pub fn new(name: &'static str) -> Self {
	ScopeTimer { start: Instant::now(), name }
    }
}

#[cfg(debug_assertions)]
impl Drop for ScopeTimer {
    fn drop(&mut self) {
	println!("{} took {:?}", self.name, self.start.elapsed());
    }
}

#[macro_export]
macro_rules! time_scope {
    () => {
	use common::ScopeTimer;
        let _magical_scope_timer_ = ScopeTimer::new("scope");
    };
    ( $name:expr ) => {
	use common::ScopeTimer;
        let _magical_scope_timer_ = ScopeTimer::new($name);
    };
}