Crate autosized_num 

AutoSized Int Macros

This crate provides a set of procedural macros that automatically select the smallest integer type capable of representing a given literal.

• auto_sized_unsigned! / auto_sized_unsigned_val!
  → Choose among unsigned integers (u8, u16, u32, u64, u128).

• auto_sized_signed! / auto_sized_signed_val!
  → Choose among signed integers (i8, i16, i32, i64, i128).

• auto_sized_int! / auto_sized_int_val!
  → If the literal is negative, a signed type is chosen.
  If the literal is non‑negative, an unsigned type is chosen.
  The accepted input range is the full i128 domain (not u128).

Type vs. Value Macros

• *_unsigned!, *_signed!, *_int! → expand to a type.
• *_val variants → expand to a value (with an explicit as cast).

Examples

use autosized_num::*;

// Type macros
type T1 = auto_sized_unsigned!(300); // expands to u16
type T2 = auto_sized_signed!(-200);  // expands to i16
type T3 = auto_sized_int!(10);       // expands to u8
type T4 = auto_sized_int!(-10);      // expands to i8

// Value macros
let a = auto_sized_unsigned_val!(300); // 300u16
let b = auto_sized_signed_val!(-200);  // -200i16
let c = auto_sized_int_val!(10);       // 10u8
let d = auto_sized_int_val!(-10);      // -10i8

Intended Use Cases

• Binary parsing or serialization where minimal integer widths matter.
• Defining constants or generic parameters with the smallest fitting type.
• Compile‑time tests ensuring literals map to the expected integer type.

Notes

• auto_sized_int! and auto_sized_int_val! accept the full i128 range.
• Non‑integer inputs will trigger a compile_error!.

Macros

auto_sized_int

Returns the smallest integer type (signed or unsigned) that can represent the given literal.

auto_sized_int_val

Returns the given literal as a value, cast to the smallest integer type (signed or unsigned) that can represent it.

auto_sized_signed

Returns the smallest signed integer type (i8, i16, i32, i64, or i128) that can represent the given literal.

auto_sized_signed_val

Returns the given literal as a value, cast to the smallest signed integer type that can represent it.

auto_sized_unsigned

Returns the smallest unsigned integer type (u8, u16, u32, u64, or u128) that can represent the given literal.

auto_sized_unsigned_val

Returns the given literal as a value, cast to the smallest unsigned integer type that can represent it.