Struct TypedEnvVar 

pub struct TypedEnvVar<T> { /* private fields */ }

A typed environment variable wrapper with caller-provided parsing.

Implementations

impl<T> TypedEnvVar<T>

pub const fn new(name: EnvVarName) -> Self

Creates a typed environment variable wrapper.

pub const fn name(&self) -> &EnvVarName

Returns the underlying environment variable name.

pub fn read_with<E>( &self, parser: impl FnOnce(&str) -> Result<T, E>, ) -> Result<T, TypedEnvVarError<E>>

Reads and parses the environment variable with a caller-provided parser.

Errors

Returns TypedEnvVarError::Read when the variable cannot be read and TypedEnvVarError::Parse when the parser rejects the value.

pub fn read_parse(&self) -> Result<T, TypedEnvVarError<T::Err>>

where T: FromStr,

Reads and parses the environment variable with FromStr.

Errors

Returns TypedEnvVarError::Read when the variable cannot be read and TypedEnvVarError::Parse when T::from_str rejects the value.

Trait Implementations

impl<T: Clone> Clone for TypedEnvVar<T>

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

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<T: Debug> Debug for TypedEnvVar<T>

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

Formats the value using the given formatter.

impl<T: PartialEq> PartialEq for TypedEnvVar<T>

fn eq(&self, other: &TypedEnvVar<T>) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl<T: Eq> Eq for TypedEnvVar<T>

impl<T> StructuralPartialEq for TypedEnvVar<T>