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use core::borrow::Borrow;
use alloc::collections::BTreeSet;
use core::hash::Hash;
use crate::At;
#[cfg(feature="hashbrown")]
impl<T> At<(T,)> for hashbrown::HashSet<T> where
T: Eq + Hash,
{
type View = Self;
fn access_at<R,F>(&mut self, item: (T,), f: F) -> Option<R> where
F: FnOnce(&mut Self) -> R
{
self.insert(item.0);
Some(f(self))
}
}
#[cfg(feature="hashbrown")]
impl<T> At<(T,())> for hashbrown::HashSet<T> where
T: Eq + Hash,
{
type View = T;
fn access_at<R,F>(&mut self, mut item: (T,()), f: F) -> Option<R> where
F: FnOnce(&mut T) -> R
{
if let Some(v) = self.take(&item.0) {
item.0 = v;
}
let result = f(&mut item.0);
self.insert(item.0);
Some(result)
}
}
#[cfg(feature="hashbrown")]
impl<Q,T> At<&Q> for hashbrown::HashSet<T> where
T: Borrow<Q> + Eq + Hash,
Q: ?Sized + Eq + Hash
{
type View = T;
fn access_at<R,F>(&mut self, i: &Q, f: F) -> Option<R> where
F: FnOnce(&mut T) -> R
{
self.take(i).map(|mut v| {
let result = f(&mut v);
self.insert(v);
result
})
}
}
#[cfg(feature="std_hashmap")]
extern crate std;
#[cfg(feature="std_hashmap")]
impl<T> At<(T,)> for std::collections::HashSet<T> where
T: Eq + Hash,
{
type View = Self;
fn access_at<R,F>(&mut self, item: (T,), f: F) -> Option<R> where
F: FnOnce(&mut Self) -> R
{
self.insert(item.0);
Some(f(self))
}
}
#[cfg(feature="std_hashmap")]
impl<T> At<(T,())> for std::collections::HashSet<T> where
T: Eq + Hash,
{
type View = T;
fn access_at<R,F>(&mut self, mut item: (T,()), f: F) -> Option<R> where
F: FnOnce(&mut T) -> R
{
if let Some(v) = self.take(&item.0) {
item.0 = v;
}
let result = f(&mut item.0);
self.insert(item.0);
Some(result)
}
}
#[cfg(feature="std_hashmap")]
impl<Q,T> At<&Q> for std::collections::HashSet<T> where
T: Borrow<Q> + Eq + Hash,
Q: ?Sized + Eq + Hash
{
type View = T;
fn access_at<R,F>(&mut self, i: &Q, f: F) -> Option<R> where
F: FnOnce(&mut T) -> R
{
self.take(i).map(|mut v| {
let result = f(&mut v);
self.insert(v);
result
})
}
}
impl<T> At<(T,)> for BTreeSet<T> where
T: Ord,
{
type View = Self;
fn access_at<R,F>(&mut self, item: (T,), f: F) -> Option<R> where
F: FnOnce(&mut Self) -> R
{
self.insert(item.0);
Some(f(self))
}
}
impl<T> At<(T,())> for BTreeSet<T> where
T: Ord,
{
type View = T;
fn access_at<R,F>(&mut self, mut item: (T,()), f: F) -> Option<R> where
F: FnOnce(&mut T) -> R
{
if let Some(v) = self.take(&item.0) {
item.0 = v;
}
let result = f(&mut item.0);
self.insert(item.0);
Some(result)
}
}
impl<Q,T> At<&Q> for BTreeSet<T> where
T: Borrow<Q> + Ord,
Q: ?Sized + Ord
{
type View = T;
fn access_at<R,F>(&mut self, i: &Q, f: F) -> Option<R> where
F: FnOnce(&mut T) -> R
{
self.take(i).map(|mut v| {
let result = f(&mut v);
self.insert(v);
result
})
}
}