Trait FromOptionalField 

pub trait FromOptionalField<T> {
    // Required methods
    fn optional(self) -> Result<Option<T>, Error>;
    fn required(self, field: impl Into<String>) -> Result<T, Error>;
}

An extension trait that adds the methods optional and required to any Option containing a type implementing TryInto<U, Error = Error>

Required Methods

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

Converts an optional protobuf field to an option of a different type

Returns None if the option is None, otherwise calls TryInto::try_into on the contained data, returning any error encountered

fn required(self, field: impl Into<String>) -> Result<T, Error>

Converts an optional protobuf field to a different type, returning an error if None

Returns Error::MissingRequiredField if None, otherwise calls TryInto::try_into on the contained data, returning any error encountered

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.

Implementations on Foreign Types

impl<T, U> FromOptionalField<U> for Option<T>

where T: TryInto<U, Error = Error>,

fn optional(self) -> Result<Option<U>, Error>

fn required(self, field: impl Into<String>) -> Result<U, Error>

Implementors