A rust profiling macro

profiling.rs

// let (entities, duration) = profile!(world.create_entities(1_000_000));
// println!("Creating 1 million entities completed in {:?}", duration);
//
// let results: Vec<(_, Duration)> = profile_n!(100, world.create_entities(1_000_000));

#[macro_export]
macro_rules! profile {
    ($($actions:tt)*) => {
        {
            let start = std::time::Instant::now();
            let result = $($actions)*;
            let duration = start.elapsed();
            (result, duration)
        }
    }
}

#[macro_export]
macro_rules! profile_n {
	($n:tt, $($actions:tt)*) => {
		(0..$n).map(|_| {
			profile!($($actions)*)
		})
        .collect::<Vec<_>>()
	}
}