Enum tarantool::net_box::promise::TryGet

pub enum TryGet<T, E> {
    Ok(T),
    Err(E),
    Pending(Promise<T>),
}

Represents all possible value that can be returned from Promise::try_get or Promise::wait_timeout methods.

Variants

Ok(T)

Promise was kept successfully.

Err(E)

Promise will never be kept due to an error.

Pending(Promise<T>)

Promise yet is unresolved.

Implementations

impl<T, E> TryGet<T, E>

pub fn ok(self) -> Option<T>

pub fn err(self) -> Option<E>

pub fn pending(self) -> Option<Promise<T>>

pub fn into_res(self) -> Result<Result<T, E>, Promise<T>>

Converts self into a nested Result.

Returns

• Ok(Ok(value)) in case of TryGet::Ok(value).
• Ok(Err(error)) in case of TryGet::Err(error).
• Err(promise) in case of TryGet::Pending(promise).

This function basically checks if the promise is resolved (Ok) or not yet (Err).

Trait Implementations

impl<T: Debug, E: Debug> Debug for TryGet<T, E>

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<T, E> From<Result<T, E>> for TryGet<T, E>

fn from(r: Result<T, E>) -> Self

Converts to this type from the input type.

impl<T, E> From<TryGet<T, E>> for Result<Result<T, E>, Promise<T>>

fn from(r: TryGet<T, E>) -> Self

Converts to this type from the input type.