Enum EvalResult 

pub enum EvalResult<T> {
    Value(T),
    Null,
    NotLoaded {
        failed_node: String,
        attempted_path: String,
    },
}

A wrapper type for Expression API evaluation results.

Variants

Value(T)

Value is successfully loaded and present.

Null

Value is loaded but it is legitimately Null.

NotLoaded

Value is not loaded, trapping the evaluation path.

Fields

failed_node: String

attempted_path: String

Implementations

impl<T> EvalResult<T>

pub fn and_then<U, F: FnOnce(T) -> EvalResult<U>>( self, field_name: &str, f: F, ) -> EvalResult<U>

pub fn map<U, F: FnOnce(T) -> U>(self, f: F) -> EvalResult<U>

Trait Implementations

impl<T: Clone> Clone for EvalResult<T>

fn clone(&self) -> EvalResult<T>

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<T: Debug> Debug for EvalResult<T>

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

Formats the value using the given formatter.

impl<'de, T> Deserialize<'de> for EvalResult<T>

where T: Deserialize<'de>,

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl<T> Serialize for EvalResult<T>

where T: Serialize,

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.