Enum Transparency

pub enum Transparency {
    Transparent,
    SemiTransparent,
    Opaque,
}

A property of a macro expansion that determines how identifiers produced by that expansion are resolved.

Variants

Transparent

Identifier produced by a transparent expansion is always resolved at call-site. Call-site spans in procedural macros, hygiene opt-out in macro should use this.

SemiTransparent

Identifier produced by a semi-transparent expansion may be resolved either at call-site or at definition-site. If it’s a local variable, label or $crate then it’s resolved at def-site. Otherwise it’s resolved at call-site. macro_rules macros behave like this, built-in macros currently behave like this too, but that’s an implementation detail.

Opaque

Identifier produced by an opaque expansion is always resolved at definition-site. Def-site spans in procedural macros, identifiers from macro by default use this.

Implementations

impl Transparency

pub fn is_opaque(&self) -> bool

Returns true if the transparency is Opaque.

Trait Implementations

impl Clone for Transparency

fn clone(&self) -> Transparency

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Transparency

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

Formats the value using the given formatter.

impl Hash for Transparency

fn hash<__H>(&self, state: &mut __H)

where __H: Hasher,

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl PartialEq for Transparency

fn eq(&self, other: &Transparency) -> 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 PartialOrd for Transparency

fn partial_cmp(&self, other: &Transparency) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

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

Tests less than (for self and other) and is used by the < operator.

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

Tests less than or equal to (for self and other) and is used by the <= operator.

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

Tests greater than (for self and other) and is used by the > operator.

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

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl Copy for Transparency

impl Eq for Transparency

impl StructuralPartialEq for Transparency