Enum Safety 

pub enum Safety {
    Safe(Safe),
    Unsafe(Unsafe),
    Default,
}

Safe, unsafe or default.

Variants

Safe(Safe)

The item is qualified as safe.

Unsafe(Unsafe)

The item is qualified as unsafe.

Default

The item is not qualified either way.

Implementations

impl Safety

pub fn parse_safe_or_unsafe(input: ParseStream<'_>) -> Result<Self>

Parses safe, unsafe, or default (neither).

This is appropriate for matching the syntax of extern blocks, in which functions are unsafe by default and require safe otherwise.

unsafe extern "C" {
    fn implicitly_unsafe();
    unsafe fn explicitly_unsafe();
    safe fn explicitly_safe();
}

pub fn parse_unsafe_only(input: ParseStream<'_>) -> Result<Self>

Parses unsafe or default (nothing).

This is appropriate for functions not within an extern block, which are safe by default and cannot be explicitly marked safe.

fn implicitly_safe() {}
unsafe fn explicitly_unsafe() {}

// safe fn explicitly_safe() {}
// ^^^^ ERROR: items outside of `unsafe extern { }` cannot be declared with `safe` safety qualifier

Trait Implementations

impl Clone for Safety

Available on crate feature full only.

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Safety

Available on crate feature full only.

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

Formats the value using the given formatter.

impl Default for Safety

fn default() -> Self

Returns the “default value” for a type.

impl Eq for Safety

Available on crate feature full only.

impl Hash for Safety

Available on crate feature full only.

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 Safety

Available on crate feature full only.

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

Equality operator ==.

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

Inequality operator !=.

impl ToTokens for Safety

fn to_tokens(&self, tokens: &mut TokenStream)

Write self to the given TokenStream.

fn to_token_stream(&self) -> TokenStream

Convert self directly into a TokenStream object.

fn into_token_stream(self) -> TokenStream

where Self: Sized,

Convert self directly into a TokenStream object.