Attribute Macro stateful 

#[stateful]

Inject app states into the annotated function.

Arguments

init

A list of argument names to initialize to their default values if they are not already initialized. This requires the specified states to implement Default.

Examples

Injecting multiple states

use app_state::{AppState, MutAppState, stateful};

struct SomeState;
struct SomeMutState;
struct SomeOtherState;

#[stateful]
fn foo(app_state: AppState<SomeState>,
  mut_app_state: MutAppState<SomeMutState>,
  mut other_state: MutAppStateLock<SomeOtherState>) {
  // ...
}

fn main() {
  AppState::init(SomeState);
  MutAppState::init(SomeMutState);
  MutAppState::init(SomeOtherState);

  foo();
}

Injecting states with default values

use app_state::{AppState, MutAppState, stateful};

#[derive(Default)]
struct SomeState;
#[derive(Default)]
struct SomeMutState;
#[derive(Default)]
struct SomeOtherState;

#[stateful(init(app_state, mut_app_state, other_state))]
fn foo(app_state: AppState<SomeState>,
  mut_app_state: MutAppState<SomeMutState>,
  mut other_state: MutAppStateLock<SomeOtherState>) {
  // ...
}

fn main() {
  // All states will be initialized with their default values
  // if they are not already initialized.
  foo();
}