financial-ops-macros

Procedural macros for financial-ops.

This crate provides the checked! macro, which recursively rewrites an arithmetic expression into a chain of the standard library's checked arithmetic methods while preserving operator precedence and grouping.

You normally don't depend on this crate directly — the macro is re-exported as financial_ops::checked.

use financial_ops::checked;

// Respects precedence: this is `a + (b * c)`, fully checked.
let value: Option<u64> = checked! { 2u64 + 3 * 4 };
assert_eq!(value, Some(14));

// Overflow short-circuits to `None`.
assert_eq!(checked! { u8::MAX + 1u8 }, None);

// With `@ <error>` you get a `Result<T, E>`, where `E` is just the type of the
// expression you pass — a string literal makes `E = &str`, no external crate
// (e.g. anyhow) required.
let result: Result<u64, &str> = checked! { 2u64 + 2 @ "overflow" };
assert_eq!(result, Ok(4));