Trait FromEnv

pub trait FromEnv
where
    Self: Sized,
{
    // Required method
    fn from_env(
        env_var: &str,
        val: Option<String>,
        default: Option<String>,
    ) -> Self;
}

Required Methods

fn from_env(env_var: &str, val: Option<String>, default: Option<String>) -> Self

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 FromEnv for bool

fn from_env(env_var: &str, val: Option<String>, default: Option<String>) -> Self

impl FromEnv for f32

fn from_env(env_var: &str, val: Option<String>, default: Option<String>) -> Self

impl FromEnv for f64

fn from_env(env_var: &str, val: Option<String>, default: Option<String>) -> Self

impl FromEnv for i8

fn from_env(env_var: &str, val: Option<String>, default: Option<String>) -> Self

impl FromEnv for i16

fn from_env(env_var: &str, val: Option<String>, default: Option<String>) -> Self

impl FromEnv for i32

fn from_env(env_var: &str, val: Option<String>, default: Option<String>) -> Self

impl FromEnv for i64

fn from_env(env_var: &str, val: Option<String>, default: Option<String>) -> Self

impl FromEnv for i128

fn from_env(env_var: &str, val: Option<String>, default: Option<String>) -> Self

impl FromEnv for isize

fn from_env(env_var: &str, val: Option<String>, default: Option<String>) -> Self

impl FromEnv for u8

fn from_env(env_var: &str, val: Option<String>, default: Option<String>) -> Self

impl FromEnv for u16

fn from_env(env_var: &str, val: Option<String>, default: Option<String>) -> Self

impl FromEnv for u32

fn from_env(env_var: &str, val: Option<String>, default: Option<String>) -> Self

impl FromEnv for u64

fn from_env(env_var: &str, val: Option<String>, default: Option<String>) -> Self

impl FromEnv for u128

fn from_env(env_var: &str, val: Option<String>, default: Option<String>) -> Self

impl FromEnv for usize

fn from_env(env_var: &str, val: Option<String>, default: Option<String>) -> Self

impl FromEnv for String

fn from_env(env_var: &str, val: Option<String>, default: Option<String>) -> Self

impl<T> FromEnv for Option<T>

where T: FromEnv,

fn from_env(env_var: &str, val: Option<String>, default: Option<String>) -> Self

Implementors