cajeta.hash.DefaultHasher — the hasher the compiler-synthesized Object.hash() uses under the hood: process-seeded XXH3-64. @AutoHash field-folding routes through this same shape, and String.hash() does too. Internally it is a XXHash3 constructed with the process seed, exposed as a distinct class so the compiler couples to DefaultHasher rather than to a specific algorithm. Construct one to compose an object’s structural hash with extra context, or with an explicit seed to reproduce a digest computed in another process (get the seed from Hash.processSeed()).

DefaultHasher hasher = heap DefaultHasher();
Object order = heap Object();
hasher.writeObject(order);        // structural fold of the object
hasher.writeString("tenant-42");  // extra context
int64 digest = hasher.finish();

Methods

Signature
`DefaultHasher()` ⚑	Construct with the per-process seed — digests match the compiler-synthesized `Object.hash()`
`DefaultHasher(int64 seedArg)` ⚑	Construct with an explicit seed — pass a seed captured from `Hash` in another process to reproduce its digest
`void writeBoolean(boolean v)`	Fold `v` into the backing `XXHash3` as one byte: `1` for true, `0` for false
`void writeInt8(int8 v)`	Fold the raw byte of `v`
`void writeInt16(int16 v)`	Fold the 2 raw bytes of `v`
`void writeInt32(int32 v)`	Fold the 4 raw bytes of `v`
`void writeInt64(int64 v)`	Fold the 8 raw bytes of `v`
`void writeUInt8(uint8 v)`	Fold the raw byte of `v`
`void writeUInt16(uint16 v)`	Fold the 2 raw bytes of `v`
`void writeUInt32(uint32 v)`	Fold the 4 raw bytes of `v`
`void writeUInt64(uint64 v)`	Fold the 8 raw bytes of `v`
`void writeFloat32(float32 v)`	Fold the 4 raw bytes of `v`
`void writeFloat64(float64 v)`	Fold the 8 raw bytes of `v`
`void writeBytes(int8[] data)`	Fold every byte of `data`
`void writeBytesRange(int8[] data, int64 offset, int64 length)`	Fold `length` bytes of `data`
`void writeString(String s)`	Fold the UTF-8 content of the `String` (same shape as `String.hash()`)
`void writeObject(Object obj)`	Fold the structural hash of the `Object` — the `@AutoHash` field-folding shape
`int64 finish()`	Close the stream and return the 64-bit digest of everything written so far

⚑ = @EntryPoint

DefaultHasher

Methods

See also