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SPECS Declaration

A simple macro to effectively create SPECS systems.

Adding To Your Project

Add the following to your Cargo.toml file:

specs_declaration = "*"

Usage

• system!
• Give the name of the system and, optionally, the generic parameters
• Give the content of your usual SystemData, in the form of a closure
• Write your operations as if you were in the usual run(&self, params..) function of the System

use specs::*;

system!(SystemName, |velocity: WriteStorage<'a, Velocity>| {
    for vel in (&velocity,).join() {
        println!("velocity: {}, {}, {}", vel.x, vel.y, vel.z);
    }
});

With generics:

use specs::*;

system!(SystemName<T: Debug + Send + Sync + 'static>, |my_resource: Read<'a, T>, velocity: WriteStorage<'a, Velocity>| {
    println!("My Generic Resource: {:?}", my_resource);

    for vel in (&velocity,).join() {
        println!("velocity: {}, {}, {}", vel.x, vel.y, vel.z);
    }
});

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