rssn 0.2.9

A comprehensive scientific computing library for Rust, aiming for feature parity with NumPy and SymPy.
Documentation 
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//! Bincode-based FFI API for numerical integration.

use serde::Deserialize;

use crate::ffi_apis::common::BincodeBuffer;
use crate::ffi_apis::common::from_bincode_buffer;
use crate::ffi_apis::common::to_bincode_buffer;
use crate::ffi_apis::ffi_api::FfiResult;
use crate::numerical::integrate::QuadratureMethod;
use crate::numerical::integrate::{
    self,
};
use crate::symbolic::core::Expr;

#[derive(Deserialize)]
struct QuadratureInput {
    expr: Expr,
    var: String,
    a: f64,
    b: f64,
    n_steps: usize,
    method: QuadratureMethod,
}

/// Performs numerical integration via Bincode.
///
/// # Safety
///
/// This function is unsafe because it dereferences raw pointers as part of the FFI boundary.
/// The caller must ensure:
/// 1. All pointer arguments are valid and point to initialized memory.
/// 2. The memory layout of passed structures matches the expected C-ABI layout.
/// 3. Any pointers returned by this function are managed according to the API's ownership rules.
#[unsafe(no_mangle)]
pub unsafe extern "C" fn rssn_numerical_quadrature_bincode(buffer: BincodeBuffer) -> BincodeBuffer {
    let input: QuadratureInput = match from_bincode_buffer(&buffer) {
        | Some(v) => v,
        | None => {
            let res: FfiResult<f64, String> = FfiResult {
                ok: None,
                err: Some("Bincode decoding error".to_string()),
            };

            return to_bincode_buffer(&res);
        },
    };

    let result = integrate::quadrature(
        &input.expr,
        &input.var,
        (input.a, input.b),
        input.n_steps,
        &input.method,
    );

    let res = match result {
        | Ok(val) => {
            FfiResult {
                ok: Some(val),
                err: None::<String>,
            }
        },
        | Err(e) => {
            FfiResult {
                ok: None,
                err: Some(e),
            }
        },
    };

    to_bincode_buffer(&res)
}