Trait StoreResultExt 

pub trait StoreResultExt<T, E: StoreErrorPredicates> {
    // Required method
    fn optional(self) -> Result<Option<T>, E>;
}

Extension methods for store results.

Required Methods

fn optional(self) -> Result<Option<T>, E>

Converts a “key not found” error into absence.

Mapping:

• Ok(v) -> Ok(Some(v))
• Err(e) where e.is_key_not_found() -> Ok(None)
• any other Err(e) -> Err(e)

This method does not panic.

Dyn Compatibility

This trait is dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementations on Foreign Types

impl<T, E: StoreErrorPredicates> StoreResultExt<T, E> for Result<T, E>

fn optional(self) -> Result<Option<T>, E>

Implementors