Trait Domain

pub trait Domain: Sized {
    // Required methods
    fn to_u32(&self) -> u32;
    fn from_u32(member: InDomain) -> Self;
    fn is_continuous() -> bool;
    fn ordered_values() -> impl DoubleEndedIterator<Item = u32>;
    fn ordered_values_range(
        range: RangeInclusive<Self>,
    ) -> impl DoubleEndedIterator<Item = u32>;
    fn count() -> u64;
}

Defines the domain of IntSet member types.

Members of IntSet must implement this trait. Members of IntSet’s must meet the following conditions to be used in an IntSet:

1. Every possible unique value of T must be able map to and from a unique u32 integer.

2. The mapped u32 values must retain the same ordering as the values in T.

3. ordered_values() must iterate over all values in T in sorted order (ascending).

from_u32() will only ever be called with u32 values that are part of the domain of T as defined by an implementation of this trait. So it doesn’t need to correctly handle values that are outside the domain of T.

Required Methods

fn to_u32(&self) -> u32

Converts this value of T to a value in u32.

The mapped value must maintain the same ordering as T.

fn from_u32(member: InDomain) -> Self

Converts a mapped u32 value back to T.

Will only ever be called with values produced by to_u32.

fn is_continuous() -> bool

Returns true if all u32 values between the mapped u32 min and mapped u32 max value of T are used.

fn ordered_values() -> impl DoubleEndedIterator<Item = u32>

Returns an iterator which iterates over all values in the domain of T

Values should be converted to u32’s according to the mapping defined in to_u32/from_u32.

fn ordered_values_range( range: RangeInclusive<Self>, ) -> impl DoubleEndedIterator<Item = u32>

Return an iterator which iterates over all values of T in the given range.

Values should be converted to u32’s according to the mapping defined in to_u32/from_u32.

fn count() -> u64

Returns the number of members in the domain.

Object Safety

This trait is not object safe.

Implementations on Foreign Types

impl Domain for u8

fn to_u32(&self) -> u32

fn from_u32(member: InDomain) -> u8

fn is_continuous() -> bool

fn ordered_values() -> impl DoubleEndedIterator<Item = u32>

fn ordered_values_range( range: RangeInclusive<u8>, ) -> impl DoubleEndedIterator<Item = u32>

fn count() -> u64

impl Domain for u16

fn to_u32(&self) -> u32

fn from_u32(member: InDomain) -> u16

fn is_continuous() -> bool

fn ordered_values() -> impl DoubleEndedIterator<Item = u32>

fn ordered_values_range( range: RangeInclusive<u16>, ) -> impl DoubleEndedIterator<Item = u32>

fn count() -> u64

impl Domain for u32

fn to_u32(&self) -> u32

fn from_u32(member: InDomain) -> u32

fn is_continuous() -> bool

fn ordered_values() -> impl DoubleEndedIterator<Item = u32>

fn ordered_values_range( range: RangeInclusive<u32>, ) -> impl DoubleEndedIterator<Item = u32>

fn count() -> u64

impl Domain for GlyphId16

fn to_u32(&self) -> u32

fn from_u32(member: InDomain) -> GlyphId16

fn is_continuous() -> bool

fn ordered_values() -> impl DoubleEndedIterator<Item = u32>

fn ordered_values_range( range: RangeInclusive<GlyphId16>, ) -> impl DoubleEndedIterator<Item = u32>

fn count() -> u64

impl Domain for GlyphId

fn to_u32(&self) -> u32

fn from_u32(member: InDomain) -> GlyphId

fn is_continuous() -> bool

fn ordered_values() -> impl DoubleEndedIterator<Item = u32>

fn ordered_values_range( range: RangeInclusive<GlyphId>, ) -> impl DoubleEndedIterator<Item = u32>

fn count() -> u64

impl Domain for Tag

fn to_u32(&self) -> u32

fn from_u32(member: InDomain) -> Tag

fn is_continuous() -> bool

fn ordered_values() -> impl DoubleEndedIterator<Item = u32>

fn ordered_values_range( range: RangeInclusive<Tag>, ) -> impl DoubleEndedIterator<Item = u32>

fn count() -> u64

Implementors

impl Domain for NameId