//! assert_eq!(set, Enum::A | Enum::E | Enum::G);
//! ```
-pub use enumset_derive::*;
+pub use enumset_derive::EnumSetType;
use core::cmp::Ordering;
use core::fmt;
use core::iter::FromIterator;
use core::ops::*;
-use num_traits::*;
-
#[doc(hidden)]
/// Everything in this module is internal API and may change at any time.
pub mod __internal {
mod private {
use super::*;
+ use core::convert::TryInto;
/// A trait marking valid underlying bitset storage types and providing the
/// operations `EnumSet` and related types use.
pub trait EnumSetTypeRepr :
- PrimInt + WrappingSub + CheckedShl + Debug + Hash + FromPrimitive + ToPrimitive +
- AsPrimitive<u8> + AsPrimitive<u16> + AsPrimitive<u32> + AsPrimitive<u64> +
- AsPrimitive<u128> + AsPrimitive<usize>
+ // Basic traits used to derive traits
+ Copy +
+ Ord +
+ Eq +
+ Debug +
+ Hash +
+ // Operations used by enumset
+ BitAnd<Output = Self> +
+ BitOr<Output = Self> +
+ BitXor<Output = Self> +
+ Not<Output = Self> +
{
const WIDTH: u32;
+ fn is_empty(&self) -> bool;
+ fn empty() -> Self;
+
+ fn add_bit(&mut self, bit: u32);
+ fn remove_bit(&mut self, bit: u32);
+ fn has_bit(&self, bit: u32) -> bool;
+
+ fn count_ones(&self) -> u32;
+ fn count_remaining_ones(&self, cursor: u32) -> usize;
+ fn leading_zeros(&self) -> u32;
+
fn from_u8(v: u8) -> Self;
fn from_u16(v: u16) -> Self;
fn from_u32(v: u32) -> Self;
fn from_u64(v: u64) -> Self;
fn from_u128(v: u128) -> Self;
fn from_usize(v: usize) -> Self;
+
+ fn to_u8(&self) -> u8;
+ fn to_u16(&self) -> u16;
+ fn to_u32(&self) -> u32;
+ fn to_u64(&self) -> u64;
+ fn to_u128(&self) -> u128;
+ fn to_usize(&self) -> usize;
+
+ fn from_u8_opt(v: u8) -> Option<Self>;
+ fn from_u16_opt(v: u16) -> Option<Self>;
+ fn from_u32_opt(v: u32) -> Option<Self>;
+ fn from_u64_opt(v: u64) -> Option<Self>;
+ fn from_u128_opt(v: u128) -> Option<Self>;
+ fn from_usize_opt(v: usize) -> Option<Self>;
+
+ fn to_u8_opt(&self) -> Option<u8>;
+ fn to_u16_opt(&self) -> Option<u16>;
+ fn to_u32_opt(&self) -> Option<u32>;
+ fn to_u64_opt(&self) -> Option<u64>;
+ fn to_u128_opt(&self) -> Option<u128>;
+ fn to_usize_opt(&self) -> Option<usize>;
}
macro_rules! prim {
($name:ty, $width:expr) => {
impl EnumSetTypeRepr for $name {
const WIDTH: u32 = $width;
- fn from_u8(v: u8) -> Self { v.as_() }
- fn from_u16(v: u16) -> Self { v.as_() }
- fn from_u32(v: u32) -> Self { v.as_() }
- fn from_u64(v: u64) -> Self { v.as_() }
- fn from_u128(v: u128) -> Self { v.as_() }
- fn from_usize(v: usize) -> Self { v.as_() }
+
+ fn is_empty(&self) -> bool { *self == 0 }
+ fn empty() -> Self { 0 }
+
+ fn add_bit(&mut self, bit: u32) {
+ *self |= 1 << bit as $name;
+ }
+ fn remove_bit(&mut self, bit: u32) {
+ *self &= !(1 << bit as $name);
+ }
+ fn has_bit(&self, bit: u32) -> bool {
+ (self & (1 << bit as $name)) != 0
+ }
+
+ fn count_ones(&self) -> u32 { (*self).count_ones() }
+ fn leading_zeros(&self) -> u32 { (*self).leading_zeros() }
+
+ fn count_remaining_ones(&self, cursor: u32) -> usize {
+ let left_mask =
+ !((1 as $name).checked_shl(cursor).unwrap_or(0).wrapping_sub(1));
+ (*self & left_mask).count_ones() as usize
+ }
+
+ fn from_u8(v: u8) -> Self { v as $name }
+ fn from_u16(v: u16) -> Self { v as $name }
+ fn from_u32(v: u32) -> Self { v as $name }
+ fn from_u64(v: u64) -> Self { v as $name }
+ fn from_u128(v: u128) -> Self { v as $name }
+ fn from_usize(v: usize) -> Self { v as $name }
+
+ fn to_u8(&self) -> u8 { (*self) as u8 }
+ fn to_u16(&self) -> u16 { (*self) as u16 }
+ fn to_u32(&self) -> u32 { (*self) as u32 }
+ fn to_u64(&self) -> u64 { (*self) as u64 }
+ fn to_u128(&self) -> u128 { (*self) as u128 }
+ fn to_usize(&self) -> usize { (*self) as usize }
+
+ fn from_u8_opt(v: u8) -> Option<Self> { v.try_into().ok() }
+ fn from_u16_opt(v: u16) -> Option<Self> { v.try_into().ok() }
+ fn from_u32_opt(v: u32) -> Option<Self> { v.try_into().ok() }
+ fn from_u64_opt(v: u64) -> Option<Self> { v.try_into().ok() }
+ fn from_u128_opt(v: u128) -> Option<Self> { v.try_into().ok() }
+ fn from_usize_opt(v: usize) -> Option<Self> { v.try_into().ok() }
+
+ fn to_u8_opt(&self) -> Option<u8> { (*self).try_into().ok() }
+ fn to_u16_opt(&self) -> Option<u16> { (*self).try_into().ok() }
+ fn to_u32_opt(&self) -> Option<u32> { (*self).try_into().ok() }
+ fn to_u64_opt(&self) -> Option<u64> { (*self).try_into().ok() }
+ fn to_u128_opt(&self) -> Option<u128> { (*self).try_into().ok() }
+ fn to_usize_opt(&self) -> Option<usize> { (*self).try_into().ok() }
}
}
}
pub __enumset_underlying: T::Repr
}
impl <T: EnumSetType> EnumSet<T> {
- fn mask(bit: u32) -> T::Repr {
- Shl::<usize>::shl(T::Repr::one(), bit as usize)
- }
- fn has_bit(&self, bit: u32) -> bool {
- let mask = Self::mask(bit);
- self.__enumset_underlying & mask == mask
- }
- fn partial_bits(bits: u32) -> T::Repr {
- T::Repr::one().checked_shl(bits as u32)
- .unwrap_or(T::Repr::zero())
- .wrapping_sub(&T::Repr::one())
- }
-
// Returns all bits valid for the enum
fn all_bits() -> T::Repr {
T::ALL_BITS
/// Creates an empty `EnumSet`.
pub fn new() -> Self {
- EnumSet { __enumset_underlying: T::Repr::zero() }
+ EnumSet { __enumset_underlying: T::Repr::empty() }
}
/// Returns an `EnumSet` containing a single element.
pub fn only(t: T) -> Self {
- EnumSet { __enumset_underlying: Self::mask(t.enum_into_u32()) }
+ let mut set = Self::new();
+ set.insert(t);
+ set
}
/// Creates an empty `EnumSet`.
}
/// Returns `true` if the set contains no elements.
pub fn is_empty(&self) -> bool {
- self.__enumset_underlying.is_zero()
+ self.__enumset_underlying.is_empty()
}
/// Removes all elements from the set.
pub fn clear(&mut self) {
- self.__enumset_underlying = T::Repr::zero()
+ self.__enumset_underlying = T::Repr::empty()
}
/// Returns `true` if `self` has no elements in common with `other`. This is equivalent to
/// Checks whether this set contains a value.
pub fn contains(&self, value: T) -> bool {
- self.has_bit(value.enum_into_u32())
+ self.__enumset_underlying.has_bit(value.enum_into_u32())
}
/// Adds a value to this set.
/// 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_u32());
+ self.__enumset_underlying.add_bit(value.enum_into_u32());
contains
}
/// 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_u32());
+ self.__enumset_underlying.remove_bit(value.enum_into_u32());
contains
}
macro_rules! conversion_impls {
(
$(for_num!(
- $underlying:ty, $underlying_str:expr, $from_fn:ident, $to_fn:ident,
+ $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
);)*
#[doc = $underlying_str]
#[doc = "`, this method will instead return `None`."]
pub fn $try_to(&self) -> Option<$underlying> {
- self.__enumset_underlying.$to_fn()
+ EnumSetTypeRepr::$to_fn_opt(&self.__enumset_underlying)
}
#[doc = "Returns a truncated `"]
#[doc = $underlying_str]
#[doc = "`, this method will truncate any bits that don't fit."]
pub fn $to_truncated(&self) -> $underlying {
- AsPrimitive::<$underlying>::as_(self.__enumset_underlying)
+ EnumSetTypeRepr::$to_fn(&self.__enumset_underlying)
}
#[doc = "Constructs a bitset from a `"]
#[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: $underlying) -> Option<Self> {
- let bits = <T::Repr as FromPrimitive>::$from_fn(bits);
+ let bits = T::Repr::$from_fn_opt(bits);
let mask = Self::all().__enumset_underlying;
- bits.and_then(|bits| if (bits & !mask) == T::Repr::zero() {
+ bits.and_then(|bits| if (bits & !mask).is_empty() {
Some(EnumSet { __enumset_underlying: bits })
} else {
None
}
}
conversion_impls! {
- for_num!(u8, "u8", from_u8, to_u8,
+ 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,
+ 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,
+ 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,
+ 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,
+ 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,
+ 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> PartialEq<T> for EnumSet<T> {
fn eq(&self, other: &T) -> bool {
- self.__enumset_underlying == EnumSet::<T>::mask(other.enum_into_u32())
+ self.__enumset_underlying == EnumSet::only(*other).__enumset_underlying
}
}
impl <T: EnumSetType + Debug> Debug for EnumSet<T> {
while self.1 < EnumSet::<T>::bit_width() {
let bit = self.1;
self.1 += 1;
- if self.0.has_bit(bit) {
+ if self.0.__enumset_underlying.has_bit(bit) {
return 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.__enumset_underlying.count_remaining_ones(self.1);
(left, Some(left))
}
}
projects / enumset.git / commitdiff