frequenz-microgrid-formula-engine-rs

A library to create formulas over streamed data

Usage

A FormulaEngine instance can be created from a String formula with the try_new method. Such a formula can contain component placeholders, which are represented by # followed by a number. To calculate the formula, you need to provide an iterator of Option values, where

• None represents a missing value
• Some(value) represents a value.

The iterator must contain as many values as the formula has placeholders. The result of the calculation is an Option value.

use frequenz_formula_engine::{FormulaEngine, FormulaError};

fn main() -> Result<(), FormulaError> {
    let fe = FormulaEngine::try_new("#0 + #1")?;
    assert_eq!(fe.calculate(&[Some(1.0), Some(2.0)])?, Some(3.0));
    Ok(())
}