rustfst 0.3.0

Library for constructing, combining, optimizing, and searching weighted finite-state transducers (FSTs).
Documentation 
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use failure::Fallible;

use crate::algorithms::StateMapper;
use crate::fst_traits::MutableFst;

/// Mapper that returns its input.
pub struct IdentityStateMapper {}

impl<F: MutableFst> StateMapper<F> for IdentityStateMapper {
    fn map_final_weight(&self, _weight: Option<&mut F::W>) -> Fallible<()> {
        Ok(())
    }

    fn map_arcs(&self, _fst: &mut F, _state: usize) -> Fallible<()> {
        Ok(())
    }
}