Specs System Decorator

gistfile1.rs

use specs::System;
use specs::SystemData;

pub struct InstrumentedSystem<T> {
    pub system: T,
}

impl<T> InstrumentedSystem<T> {
    pub fn new(system: T) -> Self {
        InstrumentedSystem {
            system,
        }
    }
}

impl<'a, T> System<'a> for InstrumentedSystem<T>
where
    T: for<'b> System<'b>,
{
    type SystemData = <T as System<'a>::SystemData;

    fn run(&mut self, data: Self::SystemData) {
        self.system.run(data);
        // TODO Measure execution time etc.
    }
}