Trait FromConfig

pub trait FromConfig: Sized {
    // Required method
    fn from_config(
        context: &mut ConfigContext<'_>,
        value: Option<ConfigValue<'_>>,
    ) -> Result<Self, ConfigError>;
}

Generate config instance from configuration.

The most power of this crate is automatically deriving this trait. Please refer to Derive FromConfig for details.

Required Methods

fn from_config( context: &mut ConfigContext<'_>, value: Option<ConfigValue<'_>>, ) -> Result<Self, ConfigError>

Generate config from ConfigValue under context.

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 FromConfig for ()

fn from_config( _: &mut ConfigContext<'_>, _: Option<ConfigValue<'_>>, ) -> Result<Self, ConfigError>

impl<V: FromConfig> FromConfig for Option<V>

fn from_config( context: &mut ConfigContext<'_>, value: Option<ConfigValue<'_>>, ) -> Result<Self, ConfigError>

impl<V: FromConfig> FromConfig for Result<V, ConfigError>

fn from_config( context: &mut ConfigContext<'_>, value: Option<ConfigValue<'_>>, ) -> Result<Self, ConfigError>

impl<V: FromConfig> FromConfig for BTreeMap<String, V>

fn from_config( context: &mut ConfigContext<'_>, _: Option<ConfigValue<'_>>, ) -> Result<Self, ConfigError>

impl<V: FromConfig> FromConfig for Vec<V>

fn from_config( context: &mut ConfigContext<'_>, _: Option<ConfigValue<'_>>, ) -> Result<Self, ConfigError>

impl<V: FromConfig> FromConfig for HashMap<String, V>

fn from_config( context: &mut ConfigContext<'_>, _: Option<ConfigValue<'_>>, ) -> Result<Self, ConfigError>

Implementors

impl<T: FromConfig + Send + 'static> FromConfig for RefValue<T>

impl<V: FromValue> FromConfig for V