Struct Env 

pub struct Env<Fmt> { /* private fields */ }

Environment variable based Source.

Env looks for variables starting with prefix and splits the remainder of the variable name by separator to produce nested keys in the resulting JSON object.

Implementations

impl<Fmt> Env<Fmt>

where Fmt: Format,

pub fn new( prefix: impl Into<String>, separator: impl Into<Cow<'static, str>>, ) -> Self

Trait Implementations

impl<Fmt> Clone for Env<Fmt>

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<Fmt> Source for Env<Fmt>

where Fmt: Format,

fn name(&self) -> Cow<'static, str>

Human-readable source name (used in error messages and docs).

fn load(&self) -> Result<Option<Value>, ReadError>

Load the source and return Ok(Some(value)) if present, Ok(None) if the source is absent, or Err(ReadError) on error.