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use std::borrow::Borrow;
use std::i32;
use anyhow::Result;
use crate::semirings::{CompleteSemiring, ReverseBack, Semiring, SemiringProperties, StarSemiring};
#[derive(Clone, Debug, PartialEq, PartialOrd, Default, Hash, Eq, Copy)]
pub struct IntegerWeight {
value: i32,
}
impl Semiring for IntegerWeight {
type Type = i32;
type ReverseWeight = IntegerWeight;
fn zero() -> Self {
Self { value: 0 }
}
fn one() -> Self {
Self { value: 1 }
}
fn new(value: <Self as Semiring>::Type) -> Self {
IntegerWeight { value }
}
fn plus_assign<P: Borrow<Self>>(&mut self, rhs: P) -> Result<()> {
self.value += rhs.borrow().value;
Ok(())
}
fn times_assign<P: Borrow<Self>>(&mut self, rhs: P) -> Result<()> {
self.value *= rhs.borrow().value;
Ok(())
}
fn value(&self) -> &Self::Type {
&self.value
}
fn take_value(self) -> Self::Type {
self.value
}
fn set_value(&mut self, value: <Self as Semiring>::Type) {
self.value = value
}
fn reverse(&self) -> Result<Self::ReverseWeight> {
Ok(*self)
}
fn properties() -> SemiringProperties {
SemiringProperties::LEFT_SEMIRING
| SemiringProperties::RIGHT_SEMIRING
| SemiringProperties::COMMUTATIVE
}
}
impl ReverseBack<IntegerWeight> for IntegerWeight {
fn reverse_back(&self) -> Result<IntegerWeight> {
Ok(*self)
}
}
impl AsRef<IntegerWeight> for IntegerWeight {
fn as_ref(&self) -> &IntegerWeight {
&self
}
}
display_semiring!(IntegerWeight);
impl CompleteSemiring for IntegerWeight {}
impl StarSemiring for IntegerWeight {
fn closure(&self) -> Self {
if self.value == 0 {
return Self::new(1);
}
Self::new(i32::max_value())
}
}
impl Into<IntegerWeight> for i32 {
fn into(self) -> IntegerWeight {
IntegerWeight::new(self)
}
}