Enum OptionHasValue 

pub enum OptionHasValue {
    Always,
    IfPossible,
    Never,
}

Specifies how a matcher determines whether an option includes a value.

Variants

Always

Option must always include a value.

IfPossible

If it is possible for the next argument after the option code to be its value, then the matcher treats the option as having a value. Otherwise it is treated as not having a value.

This is only possible when a whitespace option value announcer is used.

Currently, if an option value which begins with an option announcer, it cannot be a possible value for an option when IfPossible is specified. That is, Matcher.option_value_can_start_with_option_announcer is ignored when IfPossible is specified.

Never

Option never has a value. It is used as a flag.

Trait Implementations

impl Debug for OptionHasValue

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

Formats the value using the given formatter.

impl PartialEq for OptionHasValue

fn eq(&self, other: &OptionHasValue) -> 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 Eq for OptionHasValue

impl StructuralPartialEq for OptionHasValue