Crate preprocessor 

preprocessor

Compile-time computation macros for Rust. Analyzes code for computable sub-expressions and evaluates them at compile time, so the final binary contains only the results.

Macros

Macro	Scope	Description
#[preprocessor::optimize]	Function	Optimizes all evaluable expressions in a function body
preprocessor::op!(...)	Expression	Evaluates a single expression at compile time

Features

Feature	Description
disabled	Disables all compile-time optimization; macros become transparent passthrough

Example

use preprocessor::op;

// Compile-time evaluation
let result = op!(1 + 2 * 3); // → 7

// With free variables — compile error
// let x = 5;
// let y = op!(x + 1); // ERROR: cannot evaluate at compile time

use preprocessor::optimize;

#[optimize]
fn compute() -> i32 {
    let a = 1 + 2; // → 3
    let b = 4 * 5; // → 20
    a + b
}

Macros

op

preprocessor::op!(...) — Expression-level macro for compile-time evaluation.

Attribute Macros

optimize

#[preprocessor::optimize] — Function-level attribute macro for compile-time optimization.

prelude

#[preprocessor::prelude] — Crate-level attribute macro for automatic dependency resolution.