Trait frame_support::traits::HandleLifetime

source · 
pub trait HandleLifetime<T> {
    fn created(_t: &T) -> Result<(), DispatchError> { ... }
    fn killed(_t: &T) -> Result<(), DispatchError> { ... }
}
Expand description

A simple, generic one-parameter event notifier/handler.

Provided Methods§

An account was created.

Examples found in repository?
src/traits/stored_map.rs (line 97)
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	fn insert(k: &K, t: T) -> Result<(), DispatchError> {
		if !S::contains_key(&k) {
			L::created(k)?;
		}
		S::insert(k, t);
		Ok(())
	}
	fn remove(k: &K) -> Result<(), DispatchError> {
		if S::contains_key(&k) {
			L::killed(k)?;
			S::remove(k);
		}
		Ok(())
	}
	fn mutate<R>(k: &K, f: impl FnOnce(&mut T) -> R) -> Result<R, DispatchError> {
		if !S::contains_key(&k) {
			L::created(k)?;
		}
		Ok(S::mutate(k, f))
	}
	fn mutate_exists<R>(k: &K, f: impl FnOnce(&mut Option<T>) -> R) -> Result<R, DispatchError> {
		S::try_mutate_exists(k, |maybe_value| {
			let existed = maybe_value.is_some();
			let r = f(maybe_value);
			let exists = maybe_value.is_some();

			if !existed && exists {
				L::created(k)?;
			} else if existed && !exists {
				L::killed(k)?;
			}
			Ok(r)
		})
	}
	fn try_mutate_exists<R, E: From<DispatchError>>(
		k: &K,
		f: impl FnOnce(&mut Option<T>) -> Result<R, E>,
	) -> Result<R, E> {
		S::try_mutate_exists(k, |maybe_value| {
			let existed = maybe_value.is_some();
			let r = f(maybe_value)?;
			let exists = maybe_value.is_some();

			if !existed && exists {
				L::created(k).map_err(E::from)?;
			} else if existed && !exists {
				L::killed(k).map_err(E::from)?;
			}
			Ok(r)
		})
	}

An account was killed.

Examples found in repository?
src/traits/stored_map.rs (line 104)
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	fn remove(k: &K) -> Result<(), DispatchError> {
		if S::contains_key(&k) {
			L::killed(k)?;
			S::remove(k);
		}
		Ok(())
	}
	fn mutate<R>(k: &K, f: impl FnOnce(&mut T) -> R) -> Result<R, DispatchError> {
		if !S::contains_key(&k) {
			L::created(k)?;
		}
		Ok(S::mutate(k, f))
	}
	fn mutate_exists<R>(k: &K, f: impl FnOnce(&mut Option<T>) -> R) -> Result<R, DispatchError> {
		S::try_mutate_exists(k, |maybe_value| {
			let existed = maybe_value.is_some();
			let r = f(maybe_value);
			let exists = maybe_value.is_some();

			if !existed && exists {
				L::created(k)?;
			} else if existed && !exists {
				L::killed(k)?;
			}
			Ok(r)
		})
	}
	fn try_mutate_exists<R, E: From<DispatchError>>(
		k: &K,
		f: impl FnOnce(&mut Option<T>) -> Result<R, E>,
	) -> Result<R, E> {
		S::try_mutate_exists(k, |maybe_value| {
			let existed = maybe_value.is_some();
			let r = f(maybe_value)?;
			let exists = maybe_value.is_some();

			if !existed && exists {
				L::created(k).map_err(E::from)?;
			} else if existed && !exists {
				L::killed(k).map_err(E::from)?;
			}
			Ok(r)
		})
	}

Implementations on Foreign Types§

Implementors§