//! }
//! ```
//!
+//! For more information on more advanced use cases, see the documentation for [`EnumSetType`].
+//!
//! # Working with EnumSets
//!
//! EnumSets can be constructed via [`EnumSet::new()`] like a normal set. In addition,
//!
//! All bitwise operations you would expect to work on bitsets also work on both EnumSets and
//! enums with `#[derive(EnumSetType)]`:
-//! ```
+//! ```rust
//! # use enumset::*;
//! # #[derive(EnumSetType, Debug)] pub enum Enum { A, B, C, D, E, F, G }
//! // Intersection of sets
//! assert_eq!(CONST_SET, Enum::A | Enum::B);
//! ```
//!
-//! Mutable operations on the [`EnumSet`] otherwise work basically as expected:
+//! Mutable operations on the [`EnumSet`] otherwise similarly to Rust's builtin sets:
//!
//! ```rust
//! # use enumset::*;
//! assert_eq!(set, Enum::A | Enum::E | Enum::G);
//! ```
-extern crate enumset_derive;
-extern crate num_traits;
-#[cfg(feature = "serde")] extern crate serde2 as serde;
-
-pub use enumset_derive::*;
-mod enumset { pub use super::*; }
+pub use enumset_derive::EnumSetType;
use core::cmp::Ordering;
use core::fmt;
use core::fmt::{Debug, Formatter};
use core::hash::{Hash, Hasher};
+use core::iter::{FromIterator, Sum};
use core::ops::*;
-use num_traits::*;
-
#[doc(hidden)]
/// Everything in this module is internal API and may change at any time.
-pub mod internal {
+pub mod __internal {
use super::*;
- /// A struct used to type check [`enum_set!`].
- pub struct EnumSetSameTypeHack<'a, T: EnumSetType + 'static> {
- pub unified: &'a [T],
- pub enum_set: EnumSet<T>,
- }
-
/// A reexport of core to allow our macros to be generic to std vs core.
- pub extern crate core;
+ pub use ::core as core_export;
/// A reexport of serde so there is no requirement to depend on serde.
- #[cfg(feature = "serde")] pub extern crate serde2 as serde;
-}
-
-mod private {
- use super::*;
- pub trait EnumSetTypeRepr : PrimInt + FromPrimitive + WrappingSub + CheckedShl + Debug + Hash {
- const WIDTH: u8;
+ #[cfg(feature = "serde")] pub use serde2 as serde;
+
+ /// The actual members of EnumSetType. Put here to avoid polluting global namespaces.
+ pub unsafe trait EnumSetTypePrivate {
+ /// The underlying type used to store the bitset.
+ type Repr: EnumSetTypeRepr;
+ /// A mask of bits that are valid in the bitset.
+ const ALL_BITS: Self::Repr;
+
+ /// Converts an enum of this type into its bit position.
+ fn enum_into_u32(self) -> u32;
+ /// Converts a bit position into an enum value.
+ unsafe fn enum_from_u32(val: u32) -> Self;
+
+ /// Serializes the `EnumSet`.
+ ///
+ /// This and `deserialize` are part of the `EnumSetType` trait so the procedural derive
+ /// can control how `EnumSet` is serialized.
+ #[cfg(feature = "serde")]
+ fn serialize<S: serde::Serializer>(set: EnumSet<Self>, ser: S) -> Result<S::Ok, S::Error>
+ where Self: EnumSetType;
+ /// Deserializes the `EnumSet`.
+ #[cfg(feature = "serde")]
+ fn deserialize<'de, D: serde::Deserializer<'de>>(de: D) -> Result<EnumSet<Self>, D::Error>
+ where Self: EnumSetType;
}
- macro_rules! prim {
- ($name:ty, $width:expr) => {
- impl EnumSetTypeRepr for $name {
- const WIDTH: u8 = $width;
- }
- }
- }
- prim!(u8 , 8 );
- prim!(u16 , 16 );
- prim!(u32 , 32 );
- prim!(u64 , 64 );
- prim!(u128, 128);
}
-use private::EnumSetTypeRepr;
+use crate::__internal::EnumSetTypePrivate;
+#[cfg(feature = "serde")] use crate::__internal::serde;
+#[cfg(feature = "serde")] use crate::serde::{Serialize, Deserialize};
+
+mod repr;
+use crate::repr::EnumSetTypeRepr;
/// The trait used to define enum types that may be used with [`EnumSet`].
///
/// This trait should be implemented using `#[derive(EnumSetType)]`. Its internal structure is
-/// not currently stable, and may change at any time.
+/// not stable, and may change at any time.
///
/// # Custom Derive
///
+/// Any C-like enum is supported, as long as there are no more than 128 variants in the enum,
+/// and no variant discriminator is larger than 127.
+///
/// The custom derive for [`EnumSetType`] automatically creates implementations of [`PartialEq`],
/// [`Sub`], [`BitAnd`], [`BitOr`], [`BitXor`], and [`Not`] allowing the enum to be used as
/// if it were an [`EnumSet`] in expressions. This can be disabled by adding an `#[enumset(no_ops)]`
/// The custom derive for `EnumSetType` automatically implements [`Copy`], [`Clone`], [`Eq`], and
/// [`PartialEq`] on the enum. These are required for the [`EnumSet`] to function.
///
-/// Any C-like enum is supported, as long as there are no more than 128 variants in the enum,
-/// and no variant discriminator is larger than 127.
+/// In addition, if you have renamed the `enumset` crate in your crate, you can use the
+/// `#[enumset(crate_name = "enumset2")]` attribute to tell the custom derive to use that name
+/// instead.
+///
+/// Attributes controlling the serialization of an `EnumSet` are documented in
+/// [its documentation](./struct.EnumSet.html#serialization).
///
/// # Examples
///
/// A, B, C, D, E, F, G,
/// }
/// ```
-pub unsafe trait EnumSetType: Copy + Eq {
- #[doc(hidden)] type Repr: EnumSetTypeRepr;
- #[doc(hidden)] const ALL_BITS: Self::Repr;
- #[doc(hidden)] fn enum_into_u8(self) -> u8;
- #[doc(hidden)] unsafe fn enum_from_u8(val: u8) -> Self;
-
- #[cfg(feature = "serde")] #[doc(hidden)]
- fn serialize<S: serde::Serializer>(set: EnumSet<Self>, ser: S) -> Result<S::Ok, S::Error>;
- #[cfg(feature = "serde")] #[doc(hidden)]
- fn deserialize<'de, D: serde::Deserializer<'de>>(de: D) -> Result<EnumSet<Self>, D::Error>;
-}
+pub unsafe trait EnumSetType: Copy + Eq + EnumSetTypePrivate { }
/// An efficient set type for enums.
///
+/// It is implemented using a bitset stored using the smallest integer that can fit all bits
+/// in the underlying enum. In general, an enum variant with a numeric value of `n` is stored in
+/// the nth least significant bit (corresponding with a mask of, e.g. `1 << enum as u32`).
+///
/// # Serialization
///
-/// The default representation serializes enumsets as an `u8`, `u16`, `u32`, `u64`, or `u128`,
-/// whichever is the smallest that can contain all bits that are part of the set.
+/// When the `serde` feature is enabled, `EnumSet`s can be serialized and deserialized using
+/// the `serde` crate. The exact serialization format can be controlled with additional attributes
+/// on the enum type. These attributes are valid regardless of whether the `serde` feature
+/// is enabled.
///
-/// Unknown bits are ignored, and are simply dropped. To override this behavior, you can add a
-/// `#[enumset(serialize_deny_unknown)]` annotation to your enum.
+/// By default, `EnumSet`s serialize by directly writing out the underlying bitset as an integer
+/// of the smallest type that can fit in the underlying enum. You can add a
+/// `#[enumset(serialize_repr = "u8")]` attribute to your enum to control the integer type used
+/// for serialization. This can be important for avoiding unintentional breaking changes when
+/// `EnumSet`s are serialized with formats like `bincode`.
///
-/// You can add a `#[enumset(serialize_repr = "u8")]` annotation to your enum to explicitly set
-/// the bit width the `EnumSet` is serialized as. This can be used to avoid breaking changes in
-/// certain serialization formats (such as `bincode`).
+/// By default, unknown bits are ignored and silently removed from the bitset. To override this
+/// behavior, you can add a `#[enumset(serialize_deny_unknown)]` attribute. This will cause
+/// deserialization to fail if an invalid bit is set.
///
-/// In addition, the `#[enumset(serialize_as_list)]` annotation causes the `EnumSet` to be
-/// instead serialized as a list. This requires your enum type implement [`Serialize`] and
-/// [`Deserialize`].
+/// In addition, the `#[enumset(serialize_as_list)]` attribute causes the `EnumSet` to be
+/// instead serialized as a list of enum variants. This requires your enum type implement
+/// [`Serialize`] and [`Deserialize`]. Note that this is a breaking change
#[derive(Copy, Clone, PartialEq, Eq)]
-pub struct EnumSet<T : EnumSetType> {
+#[repr(transparent)]
+pub struct EnumSet<T: EnumSetType> {
#[doc(hidden)]
/// This is public due to the [`enum_set!`] macro.
/// This is **NOT** public API and may change at any time.
- pub __enumset_underlying: T::Repr
+ pub __priv_repr: T::Repr
}
-impl <T : EnumSetType> EnumSet<T> {
- fn mask(bit: u8) -> T::Repr {
- Shl::<usize>::shl(T::Repr::one(), bit as usize)
- }
- fn has_bit(&self, bit: u8) -> bool {
- let mask = Self::mask(bit);
- self.__enumset_underlying & mask == mask
- }
- fn partial_bits(bits: u8) -> T::Repr {
- T::Repr::one().checked_shl(bits.into())
- .unwrap_or(T::Repr::zero())
- .wrapping_sub(&T::Repr::one())
- }
-
+impl <T: EnumSetType> EnumSet<T> {
// Returns all bits valid for the enum
fn all_bits() -> T::Repr {
T::ALL_BITS
}
- /// Returns an empty set.
+ /// Creates an empty `EnumSet`.
pub fn new() -> Self {
- EnumSet { __enumset_underlying: T::Repr::zero() }
+ EnumSet { __priv_repr: T::Repr::empty() }
}
- /// Returns a set containing a single value.
+ /// Returns an `EnumSet` containing a single element.
pub fn only(t: T) -> Self {
- EnumSet { __enumset_underlying: Self::mask(t.enum_into_u8()) }
+ let mut set = Self::new();
+ set.insert(t);
+ set
}
- /// Returns an empty set.
+ /// Creates an empty `EnumSet`.
+ ///
+ /// This is an alias for [`EnumSet::new`].
pub fn empty() -> Self {
Self::new()
}
- /// Returns a set with all bits set.
+
+ /// Returns an `EnumSet` containing all valid variants of the enum.
pub fn all() -> Self {
- EnumSet { __enumset_underlying: Self::all_bits() }
+ EnumSet { __priv_repr: Self::all_bits() }
}
- /// Total number of bits this enumset uses. Note that the actual amount of space used is
+ /// Total number of bits used by this type. Note that the actual amount of space used is
/// rounded up to the next highest integer type (`u8`, `u16`, `u32`, `u64`, or `u128`).
///
/// This is the same as [`EnumSet::variant_count`] except in enums with "sparse" variants.
/// (e.g. `enum Foo { A = 10, B = 20 }`)
- pub fn bit_width() -> u8 {
- T::Repr::WIDTH - T::ALL_BITS.leading_zeros() as u8
+ pub fn bit_width() -> u32 {
+ T::Repr::WIDTH - T::ALL_BITS.leading_zeros()
}
- /// The number of valid variants in this enumset.
+ /// The number of valid variants that this type can contain.
///
/// This is the same as [`EnumSet::bit_width`] except in enums with "sparse" variants.
/// (e.g. `enum Foo { A = 10, B = 20 }`)
- pub fn variant_count() -> u8 {
- T::ALL_BITS.count_ones() as u8
+ pub fn variant_count() -> u32 {
+ T::ALL_BITS.count_ones()
}
- /// Returns the raw bits of this set
- pub fn to_bits(&self) -> u128 {
- self.__enumset_underlying.to_u128()
- .expect("Impossible: Bits cannot be to converted into i128?")
- }
-
- /// Constructs a bitset from raw bits.
- ///
- /// # Panics
- /// If bits not in the enum are set.
- pub fn from_bits(bits: u128) -> Self {
- assert!((bits & !Self::all().to_bits()) == 0, "Bits not valid for the enum were set.");
- EnumSet {
- __enumset_underlying: T::Repr::from_u128(bits)
- .expect("Impossible: Valid bits too large to fit in repr?")
- }
- }
-
- /// Returns the number of values in this set.
+ /// Returns the number of elements in this set.
pub fn len(&self) -> usize {
- self.__enumset_underlying.count_ones() as usize
+ self.__priv_repr.count_ones() as usize
}
- /// Checks if the set is empty.
+ /// Returns `true` if the set contains no elements.
pub fn is_empty(&self) -> bool {
- self.__enumset_underlying.is_zero()
+ self.__priv_repr.is_empty()
}
/// Removes all elements from the set.
pub fn clear(&mut self) {
- self.__enumset_underlying = T::Repr::zero()
+ self.__priv_repr = T::Repr::empty()
}
- /// Checks if this set shares no elements with another.
+ /// Returns `true` if `self` has no elements in common with `other`. This is equivalent to
+ /// checking for an empty intersection.
pub fn is_disjoint(&self, other: Self) -> bool {
(*self & other).is_empty()
}
- /// Checks if all elements in another set are in this set.
+ /// Returns `true` if the set is a superset of another, i.e., `self` contains at least all the
+ /// values in `other`.
pub fn is_superset(&self, other: Self) -> bool {
- (*self & other).__enumset_underlying == other.__enumset_underlying
+ (*self & other).__priv_repr == other.__priv_repr
}
- /// Checks if all elements of this set are in another set.
+ /// Returns `true` if the set is a subset of another, i.e., `other` contains at least all
+ /// the values in `self`.
pub fn is_subset(&self, other: Self) -> bool {
other.is_superset(*self)
}
- /// Returns a set containing the union of all elements in both sets.
+ /// Returns a set containing any elements present in either set.
pub fn union(&self, other: Self) -> Self {
- EnumSet { __enumset_underlying: self.__enumset_underlying | other.__enumset_underlying }
+ EnumSet { __priv_repr: self.__priv_repr | other.__priv_repr }
}
- /// Returns a set containing all elements in common with another set.
+ /// Returns a set containing every element present in both sets.
pub fn intersection(&self, other: Self) -> Self {
- EnumSet { __enumset_underlying: self.__enumset_underlying & other.__enumset_underlying }
+ EnumSet { __priv_repr: self.__priv_repr & other.__priv_repr }
}
- /// Returns a set with all elements of the other set removed.
+ /// Returns a set containing element present in `self` but not in `other`.
pub fn difference(&self, other: Self) -> Self {
- EnumSet { __enumset_underlying: self.__enumset_underlying & !other.__enumset_underlying }
+ EnumSet { __priv_repr: self.__priv_repr.and_not(other.__priv_repr) }
}
- /// Returns a set with all elements not contained in both sets.
+ /// Returns a set containing every element present in either `self` or `other`, but is not
+ /// present in both.
pub fn symmetrical_difference(&self, other: Self) -> Self {
- EnumSet { __enumset_underlying: self.__enumset_underlying ^ other.__enumset_underlying }
+ EnumSet { __priv_repr: self.__priv_repr ^ other.__priv_repr }
}
- /// Returns a set containing all elements not in this set.
+ /// Returns a set containing all enum variants not in this set.
pub fn complement(&self) -> Self {
- EnumSet { __enumset_underlying: !self.__enumset_underlying & Self::all_bits() }
+ EnumSet { __priv_repr: !self.__priv_repr & Self::all_bits() }
}
/// Checks whether this set contains a value.
pub fn contains(&self, value: T) -> bool {
- self.has_bit(value.enum_into_u8())
+ self.__priv_repr.has_bit(value.enum_into_u32())
}
/// Adds a value to this set.
+ ///
+ /// If the set did not have this value present, `true` is returned.
+ ///
+ /// If the set did have this value present, `false` is returned.
pub fn insert(&mut self, value: T) -> bool {
- let contains = self.contains(value);
- self.__enumset_underlying = self.__enumset_underlying | Self::mask(value.enum_into_u8());
+ let contains = !self.contains(value);
+ self.__priv_repr.add_bit(value.enum_into_u32());
contains
}
- /// Removes a value from this set.
+ /// Removes a value from this set. Returns whether the value was present in the set.
pub fn remove(&mut self, value: T) -> bool {
let contains = self.contains(value);
- self.__enumset_underlying = self.__enumset_underlying & !Self::mask(value.enum_into_u8());
+ self.__priv_repr.remove_bit(value.enum_into_u32());
contains
}
/// Adds all elements in another set to this one.
pub fn insert_all(&mut self, other: Self) {
- self.__enumset_underlying = self.__enumset_underlying | other.__enumset_underlying
+ self.__priv_repr = self.__priv_repr | other.__priv_repr
}
/// Removes all values in another set from this one.
pub fn remove_all(&mut self, other: Self) {
- self.__enumset_underlying = self.__enumset_underlying & !other.__enumset_underlying
+ self.__priv_repr = self.__priv_repr.and_not(other.__priv_repr);
}
/// Creates an iterator over the values in this set.
+ ///
+ /// Note that iterator invalidation is impossible as the iterator contains a copy of this type,
+ /// rather than holding a reference to it.
pub fn iter(&self) -> EnumSetIter<T> {
- EnumSetIter(*self, 0)
+ EnumSetIter(*self)
}
}
+/// Helper macro for generating conversion functions.
+macro_rules! conversion_impls {
+ (
+ $(for_num!(
+ $underlying:ty, $underlying_str:expr,
+ $from_fn:ident $to_fn:ident $from_fn_opt:ident $to_fn_opt:ident,
+ $from:ident $try_from:ident $from_truncated:ident
+ $to:ident $try_to:ident $to_truncated:ident
+ );)*
+ ) => {
+ impl <T : EnumSetType> EnumSet<T> {$(
+ #[doc = "Returns a `"]
+ #[doc = $underlying_str]
+ #[doc = "` representing the elements of this set.\n\nIf the underlying bitset will \
+ not fit in a `"]
+ #[doc = $underlying_str]
+ #[doc = "`, this method will panic."]
+ pub fn $to(&self) -> $underlying {
+ self.$try_to().expect("Bitset will not fit into this type.")
+ }
+
+ #[doc = "Tries to return a `"]
+ #[doc = $underlying_str]
+ #[doc = "` representing the elements of this set.\n\nIf the underlying bitset will \
+ not fit in a `"]
+ #[doc = $underlying_str]
+ #[doc = "`, this method will instead return `None`."]
+ pub fn $try_to(&self) -> Option<$underlying> {
+ EnumSetTypeRepr::$to_fn_opt(&self.__priv_repr)
+ }
+
+ #[doc = "Returns a truncated `"]
+ #[doc = $underlying_str]
+ #[doc = "` representing the elements of this set.\n\nIf the underlying bitset will \
+ not fit in a `"]
+ #[doc = $underlying_str]
+ #[doc = "`, this method will truncate any bits that don't fit."]
+ pub fn $to_truncated(&self) -> $underlying {
+ EnumSetTypeRepr::$to_fn(&self.__priv_repr)
+ }
+
+ #[doc = "Constructs a bitset from a `"]
+ #[doc = $underlying_str]
+ #[doc = "`.\n\nIf a bit that doesn't correspond to an enum variant is set, this \
+ method will panic."]
+ pub fn $from(bits: $underlying) -> Self {
+ Self::$try_from(bits).expect("Bitset contains invalid variants.")
+ }
+
+ #[doc = "Attempts to constructs a bitset from a `"]
+ #[doc = $underlying_str]
+ #[doc = "`.\n\nIf a bit that doesn't correspond to an enum variant is set, this \
+ method will return `None`."]
+ pub fn $try_from(bits: $underlying) -> Option<Self> {
+ let bits = T::Repr::$from_fn_opt(bits);
+ let mask = Self::all().__priv_repr;
+ bits.and_then(|bits| if bits.and_not(mask).is_empty() {
+ Some(EnumSet { __priv_repr: bits })
+ } else {
+ None
+ })
+ }
+
+ #[doc = "Constructs a bitset from a `"]
+ #[doc = $underlying_str]
+ #[doc = "`, ignoring invalid variants."]
+ pub fn $from_truncated(bits: $underlying) -> Self {
+ let mask = Self::all().$to_truncated();
+ let bits = <T::Repr as EnumSetTypeRepr>::$from_fn(bits & mask);
+ EnumSet { __priv_repr: bits }
+ }
+ )*}
+ }
+}
+conversion_impls! {
+ for_num!(u8, "u8", from_u8 to_u8 from_u8_opt to_u8_opt,
+ from_u8 try_from_u8 from_u8_truncated as_u8 try_as_u8 as_u8_truncated);
+ for_num!(u16, "u16", from_u16 to_u16 from_u16_opt to_u16_opt,
+ from_u16 try_from_u16 from_u16_truncated as_u16 try_as_u16 as_u16_truncated);
+ for_num!(u32, "u32", from_u32 to_u32 from_u32_opt to_u32_opt,
+ from_u32 try_from_u32 from_u32_truncated as_u32 try_as_u32 as_u32_truncated);
+ for_num!(u64, "u64", from_u64 to_u64 from_u64_opt to_u64_opt,
+ from_u64 try_from_u64 from_u64_truncated as_u64 try_as_u64 as_u64_truncated);
+ for_num!(u128, "u128", from_u128 to_u128 from_u128_opt to_u128_opt,
+ from_u128 try_from_u128 from_u128_truncated as_u128 try_as_u128 as_u128_truncated);
+ for_num!(usize, "usize", from_usize to_usize from_usize_opt to_usize_opt,
+ from_usize try_from_usize from_usize_truncated
+ as_usize try_as_usize as_usize_truncated);
+}
+
impl <T: EnumSetType> Default for EnumSet<T> {
/// Returns an empty set.
fn default() -> Self {
}
}
-impl <T : EnumSetType> IntoIterator for EnumSet<T> {
+impl <T: EnumSetType> IntoIterator for EnumSet<T> {
type Item = T;
type IntoIter = EnumSetIter<T>;
self.iter()
}
}
+impl <T: EnumSetType> Sum for EnumSet<T> {
+ fn sum<I: Iterator<Item=Self>>(iter: I) -> Self {
+ iter.fold(EnumSet::empty(), |a, v| a | v)
+ }
+}
+impl <'a, T: EnumSetType> Sum<&'a EnumSet<T>> for EnumSet<T> {
+ fn sum<I: Iterator<Item=&'a Self>>(iter: I) -> Self {
+ iter.fold(EnumSet::empty(), |a, v| a | *v)
+ }
+}
+impl <T: EnumSetType> Sum<T> for EnumSet<T> {
+ fn sum<I: Iterator<Item=T>>(iter: I) -> Self {
+ iter.fold(EnumSet::empty(), |a, v| a | v)
+ }
+}
+impl <'a, T: EnumSetType> Sum<&'a T> for EnumSet<T> {
+ fn sum<I: Iterator<Item=&'a T>>(iter: I) -> Self {
+ iter.fold(EnumSet::empty(), |a, v| a | *v)
+ }
+}
-impl <T : EnumSetType, O: Into<EnumSet<T>>> Sub<O> for EnumSet<T> {
+impl <T: EnumSetType, O: Into<EnumSet<T>>> Sub<O> for EnumSet<T> {
type Output = Self;
fn sub(self, other: O) -> Self::Output {
self.difference(other.into())
}
}
-impl <T : EnumSetType, O: Into<EnumSet<T>>> BitAnd<O> for EnumSet<T> {
+impl <T: EnumSetType, O: Into<EnumSet<T>>> BitAnd<O> for EnumSet<T> {
type Output = Self;
fn bitand(self, other: O) -> Self::Output {
self.intersection(other.into())
}
}
-impl <T : EnumSetType, O: Into<EnumSet<T>>> BitOr<O> for EnumSet<T> {
+impl <T: EnumSetType, O: Into<EnumSet<T>>> BitOr<O> for EnumSet<T> {
type Output = Self;
fn bitor(self, other: O) -> Self::Output {
self.union(other.into())
}
}
-impl <T : EnumSetType, O: Into<EnumSet<T>>> BitXor<O> for EnumSet<T> {
+impl <T: EnumSetType, O: Into<EnumSet<T>>> BitXor<O> for EnumSet<T> {
type Output = Self;
fn bitxor(self, other: O) -> Self::Output {
self.symmetrical_difference(other.into())
}
}
-impl <T : EnumSetType, O: Into<EnumSet<T>>> SubAssign<O> for EnumSet<T> {
+impl <T: EnumSetType, O: Into<EnumSet<T>>> SubAssign<O> for EnumSet<T> {
fn sub_assign(&mut self, rhs: O) {
*self = *self - rhs;
}
}
-impl <T : EnumSetType, O: Into<EnumSet<T>>> BitAndAssign<O> for EnumSet<T> {
+impl <T: EnumSetType, O: Into<EnumSet<T>>> BitAndAssign<O> for EnumSet<T> {
fn bitand_assign(&mut self, rhs: O) {
*self = *self & rhs;
}
}
-impl <T : EnumSetType, O: Into<EnumSet<T>>> BitOrAssign<O> for EnumSet<T> {
+impl <T: EnumSetType, O: Into<EnumSet<T>>> BitOrAssign<O> for EnumSet<T> {
fn bitor_assign(&mut self, rhs: O) {
*self = *self | rhs;
}
}
-impl <T : EnumSetType, O: Into<EnumSet<T>>> BitXorAssign<O> for EnumSet<T> {
+impl <T: EnumSetType, O: Into<EnumSet<T>>> BitXorAssign<O> for EnumSet<T> {
fn bitxor_assign(&mut self, rhs: O) {
*self = *self ^ rhs;
}
}
-impl <T : EnumSetType> Not for EnumSet<T> {
+impl <T: EnumSetType> Not for EnumSet<T> {
type Output = Self;
fn not(self) -> Self::Output {
self.complement()
}
}
-impl <T : EnumSetType> From<T> for EnumSet<T> {
+impl <T: EnumSetType> From<T> for EnumSet<T> {
fn from(t: T) -> Self {
EnumSet::only(t)
}
}
-impl <T : EnumSetType> PartialEq<T> for EnumSet<T> {
+impl <T: EnumSetType> PartialEq<T> for EnumSet<T> {
fn eq(&self, other: &T) -> bool {
- self.__enumset_underlying == EnumSet::<T>::mask(other.enum_into_u8())
+ self.__priv_repr == EnumSet::only(*other).__priv_repr
}
}
-impl <T : EnumSetType + Debug> Debug for EnumSet<T> {
- fn fmt(&self, f: &mut Formatter) -> fmt::Result {
+impl <T: EnumSetType + Debug> Debug for EnumSet<T> {
+ fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
let mut is_first = true;
f.write_str("EnumSet(")?;
for v in self.iter() {
}
}
+#[allow(clippy::derive_hash_xor_eq)] // This impl exists to change trait bounds only.
impl <T: EnumSetType> Hash for EnumSet<T> {
fn hash<H: Hasher>(&self, state: &mut H) {
- self.__enumset_underlying.hash(state)
+ self.__priv_repr.hash(state)
}
}
impl <T: EnumSetType> PartialOrd for EnumSet<T> {
fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
- self.__enumset_underlying.partial_cmp(&other.__enumset_underlying)
+ self.__priv_repr.partial_cmp(&other.__priv_repr)
}
}
impl <T: EnumSetType> Ord for EnumSet<T> {
fn cmp(&self, other: &Self) -> Ordering {
- self.__enumset_underlying.cmp(&other.__enumset_underlying)
+ self.__priv_repr.cmp(&other.__priv_repr)
}
}
#[cfg(feature = "serde")]
-impl <T : EnumSetType> serde::Serialize for EnumSet<T> {
+impl <T: EnumSetType> Serialize for EnumSet<T> {
fn serialize<S: serde::Serializer>(&self, serializer: S) -> Result<S::Ok, S::Error> {
T::serialize(*self, serializer)
}
}
#[cfg(feature = "serde")]
-impl <'de, T : EnumSetType> serde::Deserialize<'de> for EnumSet<T> {
+impl <'de, T: EnumSetType> Deserialize<'de> for EnumSet<T> {
fn deserialize<D: serde::Deserializer<'de>>(deserializer: D) -> Result<Self, D::Error> {
T::deserialize(deserializer)
}
}
-/// The iterator used by [`EnumSet`](./struct.EnumSet.html).
-#[derive(Copy, Clone, PartialOrd, Ord, PartialEq, Eq, Hash, Debug)]
-pub struct EnumSetIter<T : EnumSetType>(EnumSet<T>, u8);
-impl <T : EnumSetType> Iterator for EnumSetIter<T> {
+/// The iterator used by [`EnumSet`]s.
+#[derive(Clone, Debug)]
+pub struct EnumSetIter<T: EnumSetType>(EnumSet<T>);
+impl <T: EnumSetType> Iterator for EnumSetIter<T> {
type Item = T;
fn next(&mut self) -> Option<Self::Item> {
- while self.1 < EnumSet::<T>::bit_width() {
- let bit = self.1;
- self.1 += 1;
- if self.0.has_bit(bit) {
- return unsafe { Some(T::enum_from_u8(bit)) }
- }
+ if self.0.is_empty() {
+ None
+ } else {
+ let bit = self.0.__priv_repr.trailing_zeros();
+ self.0.__priv_repr.remove_bit(bit);
+ unsafe { Some(T::enum_from_u32(bit)) }
}
- None
}
fn size_hint(&self) -> (usize, Option<usize>) {
- let left_mask = EnumSet::<T>::partial_bits(self.1);
- let left = (self.0.__enumset_underlying & left_mask).count_ones() as usize;
+ let left = self.0.len();
(left, Some(left))
}
}
+impl<T: EnumSetType> ExactSizeIterator for EnumSetIter<T> {}
+
+impl<T: EnumSetType> Extend<T> for EnumSet<T> {
+ fn extend<I: IntoIterator<Item = T>>(&mut self, iter: I) {
+ iter.into_iter().for_each(|v| { self.insert(v); });
+ }
+}
+
+impl<T: EnumSetType> FromIterator<T> for EnumSet<T> {
+ fn from_iter<I: IntoIterator<Item = T>>(iter: I) -> Self {
+ let mut set = EnumSet::default();
+ set.extend(iter);
+ set
+ }
+}
+
+impl<T: EnumSetType> Extend<EnumSet<T>> for EnumSet<T> {
+ fn extend<I: IntoIterator<Item = EnumSet<T>>>(&mut self, iter: I) {
+ iter.into_iter().for_each(|v| { self.insert_all(v); });
+ }
+}
+
+impl<T: EnumSetType> FromIterator<EnumSet<T>> for EnumSet<T> {
+ fn from_iter<I: IntoIterator<Item = EnumSet<T>>>(iter: I) -> Self {
+ let mut set = EnumSet::default();
+ set.extend(iter);
+ set
+ }
+}
+
/// Creates a EnumSet literal, which can be used in const contexts.
///
/// The syntax used is `enum_set!(Type::A | Type::B | Type::C)`. Each variant must be of the same
/// type, or a error will occur at compile-time.
///
-/// You may also explicitly state the type of the variants that follow, as in
-/// `enum_set!(Type, Type::A | Type::B | Type::C)`.
+/// This macro accepts trailing `|`s to allow easier use in other macros.
///
/// # Examples
///
/// # #[derive(EnumSetType, Debug)] enum Enum { A, B, C }
/// const CONST_SET: EnumSet<Enum> = enum_set!(Enum::A | Enum::B);
/// assert_eq!(CONST_SET, Enum::A | Enum::B);
-///
-/// const EXPLICIT_CONST_SET: EnumSet<Enum> = enum_set!(Enum, Enum::A | Enum::B);
-/// assert_eq!(EXPLICIT_CONST_SET, Enum::A | Enum::B);
/// ```
///
/// This macro is strongly typed. For example, the following will not compile:
/// ```
#[macro_export]
macro_rules! enum_set {
- () => {
- $crate::EnumSet { __enumset_underlying: 0 }
+ ($(|)*) => {
+ $crate::EnumSet { __priv_repr: 0 }
};
- ($($value:path)|* $(|)*) => {
- $crate::internal::EnumSetSameTypeHack {
- unified: &[$($value,)*],
- enum_set: $crate::EnumSet {
- __enumset_underlying: 0 $(| (1 << ($value as u8)))*
- },
- }.enum_set
+ ($value:path $(|)*) => {
+ {
+ #[allow(deprecated)] let value = $value.__impl_enumset_internal__const_only();
+ value
+ }
};
- ($enum_name:ty, $($value:path)|* $(|)*) => {
- $crate::EnumSet::<$enum_name> {
- __enumset_underlying: 0 $(| (1 << ($value as $enum_name as u8)))*
+ ($value:path | $($rest:path)|* $(|)*) => {
+ {
+ #[allow(deprecated)] let value = $value.__impl_enumset_internal__const_only();
+ $(#[allow(deprecated)] let value = $rest.__impl_enumset_internal__const_merge(value);)*
+ value
}
- }
+ };
}
projects / enumset.git / blobdiff