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use std::ops::{BitOr, BitAnd, BitXor, Not};
use std::cmp;
pub trait EnumFlagSize {
type Size: InnerBitFlags;
}
pub trait InnerBitFlags: BitOr<Self> + cmp::PartialEq + cmp::Eq
where Self: Sized
{
type Type;
fn all() -> Self;
fn empty() -> Self;
fn is_empty(self) -> bool;
fn is_all(self) -> bool;
fn bits(self) -> Self::Type;
fn intersects(self, other: Self) -> bool;
fn contains(self, other: Self) -> bool;
fn not(self) -> Self;
fn from_bits(bits: Self::Type) -> Option<Self>;
fn from_bits_truncate(bits: Self::Type) -> Self;
fn insert(&mut self, other: Self);
fn remove(&mut self, other: Self);
fn toggle(&mut self, other: Self);
}
#[derive(Eq, Copy, Clone)]
pub struct BitFlags<T: EnumFlagSize> {
val: T::Size,
}
impl<T> ::std::fmt::Debug for BitFlags<T>
where T: EnumFlagSize,
T::Size: ::std::fmt::Debug
{
fn fmt(&self, fmt: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {
fmt.write_str(&format!("BitFlags {o} {inner:?} {c} ",
o = "{",
inner = self.val,
c = "}"))
}
}
impl<T> BitFlags<T>
where T: EnumFlagSize
{
pub unsafe fn new(val: T::Size) -> Self {
BitFlags { val: val }
}
}
impl<T> BitFlags<T>
where T: EnumFlagSize,
T::Size: InnerBitFlags + Into<BitFlags<T>>
{
pub fn empty() -> Self {
T::Size::empty().into()
}
pub fn all() -> Self {
T::Size::all().into()
}
pub fn is_all(self) -> bool {
self.val.is_all()
}
pub fn is_empty(self) -> bool {
self.val.is_empty()
}
pub fn bits(self) -> <T::Size as InnerBitFlags>::Type {
self.val.bits()
}
pub fn intersects<B: Into<BitFlags<T>>>(self, other: B) -> bool {
T::Size::intersects(self.val, other.into().val)
}
pub fn contains<B: Into<BitFlags<T>>>(self, other: B) -> bool {
T::Size::contains(self.val, other.into().val)
}
pub fn not(self) -> Self {
self.val.not().into()
}
pub fn from_bits(bits: <T::Size as InnerBitFlags>::Type) -> Option<Self> {
T::Size::from_bits(bits).map(|v| v.into())
}
pub fn from_bits_truncate(bits: <T::Size as InnerBitFlags>::Type) -> Self {
T::Size::from_bits_truncate(bits).into()
}
pub fn toggle(&mut self, other: Self) {
T::Size::toggle(&mut self.val, other.val);
}
pub fn insert(&mut self, other: Self) {
T::Size::insert(&mut self.val, other.val);
}
pub fn remove(&mut self, other: Self) {
T::Size::remove(&mut self.val, other.val);
}
}
impl<T> std::cmp::PartialEq for BitFlags<T>
where T: EnumFlagSize
{
fn eq(&self, other: &Self) -> bool {
self.val == other.val
}
}
impl<T, B> std::ops::BitOr<B> for BitFlags<T>
where T: EnumFlagSize,
B: Into<BitFlags<T>>,
T::Size: BitOr<T::Size, Output = T::Size> + Into<BitFlags<T>>
{
type Output = BitFlags<T>;
fn bitor(self, other: B) -> BitFlags<T> {
(self.val | other.into().val).into()
}
}
impl<T, B> std::ops::BitAnd<B> for BitFlags<T>
where T: EnumFlagSize,
B: Into<BitFlags<T>>,
T::Size: BitAnd<T::Size, Output = T::Size> + Into<BitFlags<T>>
{
type Output = BitFlags<T>;
fn bitand(self, other: B) -> BitFlags<T> {
(self.val & other.into().val).into()
}
}
impl<T, B> std::ops::BitXor<B> for BitFlags<T>
where T: EnumFlagSize,
B: Into<BitFlags<T>>,
T::Size: BitXor<T::Size, Output = T::Size> + Into<BitFlags<T>>
{
type Output = BitFlags<T>;
fn bitxor(self, other: B) -> BitFlags<T> {
(self.val ^ other.into().val).into()
}
}
impl<T> std::ops::Not for BitFlags<T>
where T: EnumFlagSize,
T::Size: Not<Output = T::Size> + Into<BitFlags<T>>
{
type Output = BitFlags<T>;
fn not(self) -> BitFlags<T> {
(!self.val).into()
}
}