use std::time::{SystemTime, UNIX_EPOCH};

/// A timestamp since the unix epoch
pub type Timestamp = i64;

/// Get the current system timestamp
pub fn current_timestamp() -> Timestamp {
    let now = SystemTime::now();
    // A duration is always positive so this returns an unsigned integer, while a timestamp can
    // predate the unix epoch so we must cast to a signed integer.
    now.duration_since(UNIX_EPOCH)
        .expect("Time moves forward")
        .as_secs() as i64
}