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use super::*;
use indexmap::IndexSet;
use std::hash::Hash;
pub struct SetAppend<T: Hash + Eq + 'static>(IndexSet<T>);
impl<T: Hash + Eq + 'static> Default for SetAppend<T> {
fn default() -> Self {
Self(IndexSet::new())
}
}
impl<T: Hash + Eq + 'static> Monoid for SetAppend<T> {
fn append(mut self, other: Self) -> Self {
self.0.extend(other.0);
SetAppend(self.0)
}
fn append_all(mut self, others: impl Iterator<Item = Self>) -> Self {
let all: Vec<IndexSet<T>> = others.map(|x| x.0).collect();
let total_size = all.iter().fold(0, |acc, v| acc + v.len());
self.0.reserve(total_size);
for item in all.into_iter() {
self.0.extend(item);
}
self
}
}
impl<T: Hash + Eq + 'static> Into<IndexSet<T>> for SetAppend<T> {
fn into(self) -> IndexSet<T> {
self.0
}
}