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https://github.com/metabarcoding/obitools4.git
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Eric Coissac
8c7017a99d
- Update obioptions.Version from "Release 4.4.29" to "/v/ Release v5" - Update version.txt from 4.29 → .30 (automated by Makefile)
33 lines
1.3 KiB
Markdown
33 lines
1.3 KiB
Markdown
# Obifp Package: Generic Fixed-Point Unsigned Integer Operations
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This Go package (`obifp`) provides a generic, type-safe interface for fixed-point unsigned integer arithmetic over three size variants: `Uint64`, `Uint128`, and `Uint256`.
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## Core Interface: `FPUint[T]`
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The interface defines a unified API for unsigned integer types, supporting:
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- **Initialization & Conversion**:
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- `Zero()`, `Set64(v)`: Create zero or set from a `uint64`.
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- `AsUint64()`: Downcast to standard `uint64`.
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- **Logical Operations**:
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- Bitwise: `And`, `Or`, `Xor`, `Not`.
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- Shifts: `LeftShift(n)`, `RightShift(n)`.
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- **Arithmetic**:
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- Addition (`Add`), subtraction (`Sub`), multiplication (`Mul`). Division is commented out—likely reserved for future implementation.
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- **Comparison**:
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- Full ordering: `<`, `<=`, `>`, `>=`.
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- **Utility Predicates**:
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- `IsZero()` for zero-checking.
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## Helper Functions
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- `ZeroUint[T]`: Returns the neutral element (zero) for type `T`.
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- `OneUint[T]`: Constructs value 1 via `Set64(1)`.
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- `From64[T]`: Converts a standard Go `uint64` into the generic type.
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All operations are **method-chaining friendly** (return `T`, not pointers), enabling fluent syntax. The design promotes correctness and performance in cryptographic or financial contexts where large, fixed-size integers are required.
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