# Trait FixedSize

    pub trait FixedSize: Sized {
        const RAW_BYTE_LEN: usize;
    }

Expand description

A trait for types that have a known, constant size.

## Required Associated Constants§

#### const RAW_BYTE_LEN: usize

The raw size of this type, in bytes.

This is the size required to represent this type in a font file, which may differ from the size of the native type:

    assert_eq!(std::mem::size_of::<u16>(), u16::RAW_BYTE_LEN);
    assert_eq!(Offset24::RAW_BYTE_LEN, 3);
    assert_eq!(std::mem::size_of::<Offset24>(), 4);

## Dyn Compatibility§

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.

## Implementors§

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### impl FixedSize for ColorRecord

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#### const RAW_BYTE_LEN: usize = 4usize

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### impl FixedSize for TableRecord

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#### const RAW_BYTE_LEN: usize = 16usize

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### impl FixedSize for LookupSegment4

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#### const RAW_BYTE_LEN: usize = 6usize

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### impl FixedSize for NoPayload

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#### const RAW_BYTE_LEN: usize = 0usize

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### impl FixedSize for AnchorPoint

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#### const RAW_BYTE_LEN: usize = 4usize

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### impl FixedSize for AxisValueMap

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#### const RAW_BYTE_LEN: usize = 4usize

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### impl FixedSize for BaseLangSysRecord

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#### const RAW_BYTE_LEN: usize = 6usize

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### impl FixedSize for BaseScriptRecord

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#### const RAW_BYTE_LEN: usize = 6usize

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### impl FixedSize for FeatMinMaxRecord

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#### const RAW_BYTE_LEN: usize = 8usize

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### impl FixedSize for BdtComponent

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#### const RAW_BYTE_LEN: usize = 4usize

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### impl FixedSize for BigGlyphMetrics

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#### const RAW_BYTE_LEN: usize = 8usize

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### impl FixedSize for BitmapSize

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#### const RAW_BYTE_LEN: usize = 48usize

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### impl FixedSize for GlyphIdOffsetPair

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#### const RAW_BYTE_LEN: usize = 4usize

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### impl FixedSize for IndexSubtableRecord

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#### const RAW_BYTE_LEN: usize = 8usize

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### impl FixedSize for SbitLineMetrics

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#### const RAW_BYTE_LEN: usize = 12usize

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### impl FixedSize for SmallGlyphMetrics

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#### const RAW_BYTE_LEN: usize = 5usize

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### impl FixedSize for ConstantMapGroup

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#### const RAW_BYTE_LEN: usize = 12usize

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### impl FixedSize for EncodingRecord

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#### const RAW_BYTE_LEN: usize = 8usize

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### impl FixedSize for SequentialMapGroup

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#### const RAW_BYTE_LEN: usize = 12usize

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### impl FixedSize for SubHeader

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#### const RAW_BYTE_LEN: usize = 8usize

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### impl FixedSize for UnicodeRange

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#### const RAW_BYTE_LEN: usize = 4usize

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### impl FixedSize for UvsMapping

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#### const RAW_BYTE_LEN: usize = 5usize

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### impl FixedSize for VariationSelector

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#### const RAW_BYTE_LEN: usize = 11usize

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### impl FixedSize for BaseGlyph

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#### const RAW_BYTE_LEN: usize = 6usize

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### impl FixedSize for BaseGlyphPaint

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#### const RAW_BYTE_LEN: usize = 6usize

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### impl FixedSize for Clip

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#### const RAW_BYTE_LEN: usize = 7usize

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### impl FixedSize for ColorIndex

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#### const RAW_BYTE_LEN: usize = 4usize

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### impl FixedSize for ColorStop

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#### const RAW_BYTE_LEN: usize = 6usize

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### impl FixedSize for Layer

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#### const RAW_BYTE_LEN: usize = 4usize

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### impl FixedSize for VarColorIndex

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#### const RAW_BYTE_LEN: usize = 8usize

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### impl FixedSize for VarColorStop

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#### const RAW_BYTE_LEN: usize = 10usize

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### impl FixedSize for SignatureRecord

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#### const RAW_BYTE_LEN: usize = 12usize

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### impl FixedSize for FeatureName

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#### const RAW_BYTE_LEN: usize = 12usize

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### impl FixedSize for SettingName

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#### const RAW_BYTE_LEN: usize = 4usize

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### impl FixedSize for VariationAxisRecord

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#### const RAW_BYTE_LEN: usize = 20usize

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### impl FixedSize for GaspRange

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#### const RAW_BYTE_LEN: usize = 4usize

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### impl FixedSize for EntryExitRecord

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#### const RAW_BYTE_LEN: usize = 4usize

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### impl FixedSize for MarkRecord

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#### const RAW_BYTE_LEN: usize = 4usize

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### impl FixedSize for LongMetric

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#### const RAW_BYTE_LEN: usize = 4usize

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### impl FixedSize for Subtable0Pair

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#### const RAW_BYTE_LEN: usize = 6usize

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### impl FixedSize for ClassRangeRecord

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#### const RAW_BYTE_LEN: usize = 6usize

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### impl FixedSize for FeatureRecord

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#### const RAW_BYTE_LEN: usize = 6usize

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### impl FixedSize for FeatureTableSubstitutionRecord

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#### const RAW_BYTE_LEN: usize = 6usize

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### impl FixedSize for FeatureVariationRecord

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#### const RAW_BYTE_LEN: usize = 8usize

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### impl FixedSize for LangSysRecord

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#### const RAW_BYTE_LEN: usize = 6usize

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### impl FixedSize for RangeRecord

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#### const RAW_BYTE_LEN: usize = 6usize

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### impl FixedSize for ScriptRecord

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#### const RAW_BYTE_LEN: usize = 6usize

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### impl FixedSize for SequenceLookupRecord

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#### const RAW_BYTE_LEN: usize = 4usize

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### impl FixedSize for FTStringRange

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#### const RAW_BYTE_LEN: usize = 4usize

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### impl FixedSize for DataMapRecord

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#### const RAW_BYTE_LEN: usize = 12usize

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### impl FixedSize for ContextualEntryData

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#### const RAW_BYTE_LEN: usize = 4usize

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### impl FixedSize for Feature

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#### const RAW_BYTE_LEN: usize = 12usize

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### impl FixedSize for InsertionEntryData

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#### const RAW_BYTE_LEN: usize = 4usize

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### impl FixedSize for ValueRecord

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#### const RAW_BYTE_LEN: usize = 8usize

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### impl FixedSize for LangTagRecord

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#### const RAW_BYTE_LEN: usize = 4usize

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### impl FixedSize for NameRecord

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#### const RAW_BYTE_LEN: usize = 12usize

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### impl FixedSize for CharsetRange1

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#### const RAW_BYTE_LEN: usize = 3usize

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### impl FixedSize for CharsetRange2

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#### const RAW_BYTE_LEN: usize = 4usize

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### impl FixedSize for FdSelectRange3

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#### const RAW_BYTE_LEN: usize = 3usize

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### impl FixedSize for FdSelectRange4

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#### const RAW_BYTE_LEN: usize = 6usize

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### impl FixedSize for AxisRecord

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#### const RAW_BYTE_LEN: usize = 8usize

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### impl FixedSize for AxisValueRecord

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#### const RAW_BYTE_LEN: usize = 6usize

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### impl FixedSize for SVGDocumentRecord

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#### const RAW_BYTE_LEN: usize = 12usize

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### impl FixedSize for TrackTableEntry

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#### const RAW_BYTE_LEN: usize = 8usize

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### impl FixedSize for SparseRegionAxisCoordinates

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#### const RAW_BYTE_LEN: usize = 8usize

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### impl FixedSize for RegionAxisCoordinates

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#### const RAW_BYTE_LEN: usize = 6usize

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### impl FixedSize for VertOriginYMetrics

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#### const RAW_BYTE_LEN: usize = 4usize

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### impl<T> FixedSize for LookupSegment2<T>
where T: LookupValue,

Note: this requires `LookupSegment2` to be `repr(packed)`.

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#### const RAW_BYTE_LEN: usize

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### impl<T> FixedSize for LookupSingle<T>
where T: LookupValue,

Note: this requires `LookupSingle` to be `repr(packed)`.

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#### const RAW_BYTE_LEN: usize

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### impl<T> FixedSize for StateEntry<T>
where T: FixedSize,

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#### const RAW_BYTE_LEN: usize

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### impl<T> FixedSize for BigEndian<T>
where T: Scalar,

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#### const RAW_BYTE_LEN: usize = T::RAW_BYTE_LEN

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### impl<T> FixedSize for T
where T: Scalar,

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#### const RAW_BYTE_LEN: usize