Trait FromEnvAuto 

pub trait FromEnvAuto: Sized {
    // Required method
    fn from_env_auto(prefix: &str, var_name: &str) -> Result<Self, FromEnvError>;
}

Auto-dispatch trait for un-attributed #[derive(FromEnv)] fields.

For types that implement FromEnv (nested structs), calls from_env_with_prefix. For leaf types listed in the built-in impls, reads the env var and parses via FromStr.

You should not need to implement this trait directly.

Required Methods

fn from_env_auto(prefix: &str, var_name: &str) -> Result<Self, FromEnvError>

Read and parse the variable var_name, or load a nested struct using prefix.

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementations on Foreign Types

impl FromEnvAuto for String

fn from_env_auto(_prefix: &str, var_name: &str) -> Result<Self, FromEnvError>

impl FromEnvAuto for bool

fn from_env_auto(_prefix: &str, var_name: &str) -> Result<Self, FromEnvError>

impl FromEnvAuto for f32

fn from_env_auto(_prefix: &str, var_name: &str) -> Result<Self, FromEnvError>

impl FromEnvAuto for f64

fn from_env_auto(_prefix: &str, var_name: &str) -> Result<Self, FromEnvError>

impl FromEnvAuto for i8

fn from_env_auto(_prefix: &str, var_name: &str) -> Result<Self, FromEnvError>

impl FromEnvAuto for i16

fn from_env_auto(_prefix: &str, var_name: &str) -> Result<Self, FromEnvError>

impl FromEnvAuto for i32

fn from_env_auto(_prefix: &str, var_name: &str) -> Result<Self, FromEnvError>

impl FromEnvAuto for i64

fn from_env_auto(_prefix: &str, var_name: &str) -> Result<Self, FromEnvError>

impl FromEnvAuto for i128

fn from_env_auto(_prefix: &str, var_name: &str) -> Result<Self, FromEnvError>

impl FromEnvAuto for u8

fn from_env_auto(_prefix: &str, var_name: &str) -> Result<Self, FromEnvError>

impl FromEnvAuto for u16

fn from_env_auto(_prefix: &str, var_name: &str) -> Result<Self, FromEnvError>

impl FromEnvAuto for u32

fn from_env_auto(_prefix: &str, var_name: &str) -> Result<Self, FromEnvError>

impl FromEnvAuto for u64

fn from_env_auto(_prefix: &str, var_name: &str) -> Result<Self, FromEnvError>

impl FromEnvAuto for u128

fn from_env_auto(_prefix: &str, var_name: &str) -> Result<Self, FromEnvError>

Implementors

impl<T: FromEnv> FromEnvAuto for T