Enum Truthiness 

pub enum Truthiness {
    True,
    False,
    Falsey,
    Truthy,
    None,
    Unknown,
}

Variants

True

The expression is True.

False

The expression is False.

Falsey

The expression evaluates to a False-like value (e.g., None, 0, [], "").

Truthy

The expression evaluates to a True-like value (e.g., 1, "foo").

None

The expression evaluates to None.

Unknown

The expression evaluates to an unknown value (e.g., a variable x of unknown type).

Implementations

impl Truthiness

pub const fn is_true(&self) -> bool

Returns true if self is of variant True.

pub const fn is_false(&self) -> bool

Returns true if self is of variant False.

pub const fn is_falsey(&self) -> bool

Returns true if self is of variant Falsey.

pub const fn is_truthy(&self) -> bool

Returns true if self is of variant Truthy.

pub const fn is_none(&self) -> bool

Returns true if self is of variant None.

pub const fn is_unknown(&self) -> bool

Returns true if self is of variant Unknown.

impl Truthiness

pub fn from_expr<F>(expr: &Expr, is_builtin: F) -> Truthiness

where F: Fn(&str) -> bool,

Return the truthiness of an expression.

pub fn into_bool(self) -> Option<bool>

Trait Implementations

impl Clone for Truthiness

fn clone(&self) -> Truthiness

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Truthiness

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

Formats the value using the given formatter.

impl PartialEq for Truthiness

fn eq(&self, other: &Truthiness) -> 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 Copy for Truthiness

impl StructuralPartialEq for Truthiness