Enum Mutability 

pub enum Mutability {
    Mutable,
    Immutable,
}

Variants

Mutable

Immutable

Implementations

impl Mutability

pub fn to_syn(&self) -> Option<Mut>

pub fn from_syn(t: &Option<Mut>) -> Self

pub fn is_mutable(&self) -> bool

Returns true if &self is the mutable variant, otherwise false.

pub fn is_immutable(&self) -> bool

Returns true if &self is the immutable variant, otherwise false.

pub fn if_mut_else<T>(&self, if_mut: T, if_immut: T) -> T

Shorthand ternary operator for choosing a value based on whether a Mutability is mutable or immutable.

The following pattern (with very slight variations) shows up often in code gen:

if mutability.is_mutable() {
    ""
} else {
    "const "
}

This is particularly annoying in write!(...) statements, where cargo fmt expands it to take up 5 lines.

This method offers a 1-line alternative:

mutability.if_mut_else("", "const ")

For cases where lazy evaluation is desired, consider using a conditional or a match statement.

Trait Implementations

impl Clone for Mutability

fn clone(&self) -> Mutability

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Mutability

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for Mutability

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Hash for Mutability

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

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 Mutability

fn eq(&self, other: &Mutability) -> 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 Serialize for Mutability

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl Copy for Mutability

impl Eq for Mutability

impl StructuralPartialEq for Mutability

Layout

Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...) attributes. Please see the Rust Reference's “Type Layout” chapter for details on type layout guarantees.

Size: 1 byte

Size for each variant:

• Mutable: 0 bytes
• Immutable: 0 bytes