rustfst-ffi 1.3.1

Library for constructing, combining, optimizing, and searching weighted finite-state transducers (FSTs). Rustfst-ffi provides C interfaces of the Rust library
Documentation 
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use anyhow::anyhow;

use crate::fst::CFst;
use crate::{get_mut, wrap, RUSTFST_FFI_RESULT};

use rustfst::algorithms::invert;
use rustfst::fst_impls::VectorFst;

/// # Safety
///
/// The pointers should be valid.
#[no_mangle]
pub unsafe extern "C" fn fst_invert(ptr: *mut CFst) -> RUSTFST_FFI_RESULT {
    wrap(|| {
        let fst = get_mut!(CFst, ptr);
        let vec_fst: &mut VectorFst<_> = fst
            .downcast_mut()
            .ok_or_else(|| anyhow!("Could not downcast to vector FST"))?;
        invert(vec_fst);
        Ok(())
    })
}