Struct KeyData

pub struct KeyData { /* private fields */ }

The actual data stored in a Key.

This implements Ord so keys can be stored in e.g. BTreeMap, but the order of keys is unspecified.

Implementations

impl KeyData

pub fn as_ffi(self) -> u64

Returns the key data as a 64-bit integer. No guarantees about its value are made other than that passing it to from_ffi will return a key equal to the original.

With this you can easily pass slot map keys as opaque handles to foreign code. After you get them back you can confidently use them in your slot map without worrying about unsafe behavior as you would with passing and receiving back references or pointers.

This is not a substitute for proper serialization, use serde for that. If you are not doing FFI, you almost surely do not need this function.

pub fn from_ffi(value: u64) -> KeyData

Iff value is a value received from k.as_ffi(), returns a key equal to k. Otherwise the behavior is safe but unspecified.

Trait Implementations

impl Clone for KeyData

fn clone(&self) -> KeyData

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for KeyData

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

Formats the value using the given formatter.

impl Default for KeyData

fn default() -> KeyData

Returns the “default value” for a type.

impl Hash for KeyData

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 Ord for KeyData

fn cmp(&self, other: &KeyData) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl PartialEq for KeyData

fn eq(&self, other: &KeyData) -> 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 KeyData

fn partial_cmp(&self, other: &KeyData) -> 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 KeyData

impl Eq for KeyData

impl StructuralPartialEq for KeyData