autosized-num

Auto-sized integer macros: choose the smallest signed/unsigned type for a literal at compile time.

features

Features

• Auto-sized integer macros
  Automatically choose the smallest fitting integer type for a literal.

• Unsigned support
  auto_sized_unsigned! / auto_sized_unsigned_val! → expands to u8, u16, u32, u64, or u128.

• Signed support
  auto_sized_signed! / auto_sized_signed_val! → expands to i8, i16, i32, i64, or i128.

• Unified macros
  auto_sized_int! / auto_sized_int_val! → automatically pick signed or unsigned depending on the literal.
  Accepts the full i128 range.

• Type and value variants

  • *_unsigned!, *_signed!, *_int! → return a type.
  • *_val variants → return a value with an explicit cast.

• no_std friendly
  Expanded code uses only primitive integer types, so it works in no_std environments.

Usage

Add the crate with Cargo:

cargo add autosized-num

Then import the macros and use them in your code:

use autosized::*;

fn main() {
    // 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

    println!("{a}, {b}, {c}, {d}");
}

Notes

• auto_sized_int! / auto_sized_int_val! accept the full i128 range.
• The macros expand to primitive integer types only, so they are fully usable in no_std environments.

Crate Info

• License: MIT OR Apache-2.0
• Crate: autosized-num on crates.io
• Docs: docs.rs/autosized-num
• Repository: GitHub