ayush00git opened a new pull request, #3336:
URL: https://github.com/apache/fory/pull/3336
## Why?
As requested in Issue #3209, Dart implementation was missing support for
IEEE 754 half-precision floating-point (Float16) types that are already
available in other Fory language implementations (Rust, Go, C++, Python). This
PR adds complete Float16 support for Dart.
## What does this PR do?
This PR implements schema-based support for IEEE 754 Float16 types in the
Fory Dart library:
### Added Types
- `float16`
### Changes Made
#### 1. `lib/src/datatype/float16.dart`
Implemented the `Float16` class which wraps a 16-bit integer and handles
IEEE 754 conversions (handling rounding, subnormals, signed zeros,
NaN/Infinity):
```dart
final class Float16 extends FixedNum {
final int _bits;
// ...
factory Float16(num value) => Float16.fromDouble(value.toDouble());
double toDouble() => _bitsToDouble(_bits);
}
```
#### 2. `lib/src/memory/`
Added read/write support for 16-bit floats in `ByteReader` and `ByteWriter`:
```dart
void writeFloat16(Float16 value);
Float16 readFloat16();
```
#### 3. `lib/src/serializer/`
Registered `Float16Serializer` to handle serialization of `Float16` types in
`PrimitiveTypeSerializer`:
```dart
typeToTypeInfo[Float16]!.serializer =
Float16Serializer.cache.getSerializer(conf);
```
#### 4. `lib/src/const/dart_type.dart`
Added `FLOAT16` to `DartTypeEnum` for type inference and registry.
### Usage Example
```dart
import 'package:fory/src/datatype/float16.dart';
import 'package:fory/src/memory/byte_writer.dart';
var val = Float16(1.5);
print(val.toDouble())
// Handling limits and edge cases
var max = Float16(65504.0);
var inf = Float16(65505.0);
var subnormal = Float16(0.0000000596046);
// Serialization
var bw = ByteWriter();
bw.writeFloat16(val);
```
## Related issues
- Closes #3209
## Does this PR introduce any user-facing change?
- [x] **Does this PR introduce any public API change?**
- **Yes**: Adds `Float16` class and corresponding `NumType.float16`.
- **Yes**: Adds `readFloat16` / `writeFloat16` to memory interfaces.
- **Yes**: Exports `Float16` for user consumption.
- [x] **Does this PR introduce any binary protocol compatibility change?**
- **Yes**: Adds support for TypeId 17 (Float16).
- **Cross-language compatible**: Uses the same TypeId values as other Fory
implementations.
## Benchmark
N/A
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