#[macro_export] macro_rules! static_assert {
    ($ex:expr) => {
	const _: &[bool; ((($ex) == true) as usize)] = &[true];
    }
}

#[macro_export] macro_rules! timeout {
    ($fut:expr, $dur:expr) => {
	{
	    let dur = $dur;
	    tokio::select! {
		output = $fut => {
		    Ok(output)
		}
		_ = tokio::time::delay_for(dur) => {
		    Err($crate::util::TimeoutError::from(dur))
		}
	    }
	}
    }
}


/// Returned from timeout macro
#[derive(Debug)]
pub struct TimeoutError(tokio::time::Duration);
impl std::error::Error for TimeoutError{}
impl std::fmt::Display for TimeoutError
{
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result
    {
	write!(f, "timeout of {} ms reached", self.0.as_millis())
    }
}
impl From<tokio::time::Duration> for TimeoutError
{
    fn from(from: tokio::time::Duration) -> Self
    {
	TimeoutError(from)
    }
}
impl TimeoutError
{
    /// Get the timeout that this error lapsed on
    #[inline] pub fn timeout(&self) -> &tokio::time::Duration
    {
	&self.0
    }
}