Trait nereon::FromValue

pub trait FromValue<OK = Self> {
    fn from_value(value: Value) -> Result<OK, ConversionError>;

    fn from_no_value() -> Result<OK, ConversionError> { ... }
}

Trait for conversion from Value into arbitrary types.

This trait is used by the get and lookup Value methods.

Implementations exist for several standard types.

Implemnataions can be automatically derived by using the nereon_derive crate.

Required Methods

fn from_value(value: Value) -> Result<OK, ConversionError>

Provided Methods

fn from_no_value() -> Result<OK, ConversionError>

Implementations on Foreign Types

impl FromValue<u8> for u8

fn from_value(value: Value) -> Result<Self, ConversionError>

impl FromValue<u16> for u16

fn from_value(value: Value) -> Result<Self, ConversionError>

impl FromValue<u32> for u32

fn from_value(value: Value) -> Result<Self, ConversionError>

impl FromValue<u64> for u64

fn from_value(value: Value) -> Result<Self, ConversionError>

impl FromValue<i8> for i8

fn from_value(value: Value) -> Result<Self, ConversionError>

impl FromValue<i16> for i16

fn from_value(value: Value) -> Result<Self, ConversionError>

impl FromValue<i32> for i32

fn from_value(value: Value) -> Result<Self, ConversionError>

impl FromValue<i64> for i64

fn from_value(value: Value) -> Result<Self, ConversionError>

impl FromValue<f32> for f32

fn from_value(value: Value) -> Result<Self, ConversionError>

impl FromValue<f64> for f64

fn from_value(value: Value) -> Result<Self, ConversionError>

impl FromValue<String> for String

fn from_value(value: Value) -> Result<Self, ConversionError>

impl<T> FromValue<Option<T>> for Option<T>where
    T: FromValue,

fn from_value(value: Value) -> Result<Self, ConversionError>

fn from_no_value() -> Result<Self, ConversionError>

impl<T, S: BuildHasher + Default> FromValue<HashMap<String, T, S>> for HashMap<String, T, S>where
    T: FromValue,

fn from_value(value: Value) -> Result<Self, ConversionError>

fn from_no_value() -> Result<Self, ConversionError>

impl<T> FromValue<Vec<T, Global>> for Vec<T>where
    T: FromValue,

fn from_value(value: Value) -> Result<Self, ConversionError>

fn from_no_value() -> Result<Self, ConversionError>

Implementors

impl FromValue<Value> for Value