rssn 0.2.9

A comprehensive scientific computing library for Rust, aiming for feature parity with NumPy and SymPy.
Documentation 
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use std::ffi::c_char;

use crate::ffi_apis::common::from_json_string;
use crate::ffi_apis::common::to_json_string;
use crate::symbolic::core::Expr;
use crate::symbolic::numeric::evaluate_numerical;

/// Numerically evaluates a symbolic expression.
/// Takes a JSON string representing an `Expr` as input,
/// and returns a JSON string representing the numerical evaluation of that expression.
#[unsafe(no_mangle)]
pub extern "C" fn rssn_json_evaluate_numerical(expr_json: *const c_char) -> *mut c_char {
    let expr: Option<Expr> = from_json_string(expr_json);

    if let Some(e) = expr {
        if let Some(result) = evaluate_numerical(&e) {
            to_json_string(&result)
        } else {
            std::ptr::null_mut()
        }
    } else {
        std::ptr::null_mut()
    }
}