OpRec

A giant work in progress crate that can transform functions. It is planned to support inverses (solving for variables), derivatives using operator overloading. It can be only used in the latest Rust nightly due to rust-lang/rust#44851.

extern crate oprec;
use oprec::*;
use std::f64::consts::PI;

fn main() {
  // sin(4x)
  let mut rec = OpRec::new();
  rec *= 4;
  rec = rec.sin();
  let id = rec.id();
  // 4cos(4x)
  let cos_4 = |x: f64| 4.0*((4.0*x).cos());
  let func = rec.differentiate().functify();
  let mut map = HashMap::new();
  map.insert(id, PI);
  
  assert_eq!(cos_4(PI), func(map).ok().unwrap());
}

There is currently no documentation due to docs.rs not using the latest nightly.