Struct Engine 

pub struct Engine { /* private fields */ }

Stores and provides access to user-defined SystemGroups.

The general shape of SystemGroups, as well as the order in which they are invoked, is specifically left to the caller. When deciding which group a System should belong to, consider if there are dependencies between Systems that would encourage one to run before or after another.

Note: When processing a SystemGroup, Systems are invoked sequentially in the order they are registered.

Implementations

impl Engine

pub fn new() -> Self

pub fn register_system_group(&mut self, group: SystemGroup) -> u32

Registeres a provided SystemGroup. Returns a u32 representing the id of the provided SystemGroup, for reference during execution.

pub fn deregister_system_group(&mut self, group_id: u32)

Deregistered a SystemGroup given its id.

pub fn execute_group(&mut self, group_id: u32, params: SystemParamAccessor<'_>)

Executes a SystemGroup registered under the provided group_id, passing the SystemParams registered in the SystemParamAccessor.

pub fn reset(&mut self)

Resets all data held by the Engine, including registered SystemGroups, the EntityManager, etc.

Trait Implementations

impl Default for Engine

fn default() -> Engine

Returns the “default value” for a type.