Enum EnvKind 

pub enum EnvKind {
    OwnedFlag,
    ForeignFlag,
    OptOutFlag,
    ExactValue(&'static str),
    Path,
    Text,
    Number {
        zero_selects_default: bool,
    },
}

What kind of value a variable carries, and how it is read.

Variants

OwnedFlag

A switch the reader defines. Unknown values are off; see flag_owned.

ForeignFlag

A switch whose value space belongs to someone else. Unknown values are on; see flag_foreign.

OptOutFlag

An escape hatch that is on unless explicitly turned off. Unset is on; see flag_opt_out.

ExactValue(&'static str)

A switch that is on for exactly one spelling and off for every other, including plausible ones. Reserved for guards where honouring a misspelling would be the dangerous direction.

Path

A filesystem path.

Text

Free text – a name, scope, endpoint, or token.

Number

A number: a count, a timeout in milliseconds, a port, a descriptor.

zero_selects_default records what 0 means for this variable, because it is not the same answer everywhere. A connect timeout of zero makes every connection fail instantly and is never what anyone wants, so zero falls back to the default. A drain timeout of zero means “do not wait”, which is a perfectly reasonable thing to ask for, so zero is honoured. Leaving this unstated is how the two ended up parsed differently by accident.

Fields

zero_selects_default: bool

Trait Implementations

impl Clone for EnvKind

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for EnvKind

impl Debug for EnvKind

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

Formats the value using the given formatter.

impl Eq for EnvKind

impl PartialEq for EnvKind

fn eq(&self, other: &Self) -> bool

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for EnvKind