/rust/registry/src/index.crates.io-6f17d22bba15001f/bitvec-1.0.1/src/devel.rs

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//! Support utilities for crate development.

use core::any::TypeId;

use crate::{
  order::BitOrder,
  store::BitStore,
};

/// Constructs formatting-trait implementations by delegating.
macro_rules! easy_fmt {
  ($(impl $fmt:ident)+ for BitArray) => { $(
    impl<A, O> core::fmt::$fmt for $crate::array::BitArray<A, O>
    where
      O: $crate::order::BitOrder,
      A: $crate::view::BitViewSized,
    {
      #[inline]
      #[cfg(not(tarpaulin_include))]
      fn fmt(&self, fmt: &mut core::fmt::Formatter) -> core::fmt::Result {
        core::fmt::$fmt::fmt(self.as_bitslice(), fmt)
      }
    }
  )+ };
  ($(impl $fmt:ident)+ for $this:ident) => { $(
    impl<T, O> core::fmt::$fmt for $this<T, O>
    where
      O: $crate::order::BitOrder,
      T: $crate::store::BitStore,
    {
      #[inline]
      #[cfg(not(tarpaulin_include))]
      fn fmt(&self, fmt: &mut core::fmt::Formatter) -> core::fmt::Result {
        core::fmt::$fmt::fmt(self.as_bitslice(), fmt)
      }
    }
  )+ };
}

/// Implements some `Iterator` functions that have boilerplate behavior.
macro_rules! easy_iter {
  () => {
    #[inline]
    fn size_hint(&self) -> (usize, Option<usize>) {
      let len = self.len();
      (len, Some(len))
    }

    #[inline]
    fn count(self) -> usize {
      self.len()
    }

    #[inline]
    fn last(mut self) -> Option<Self::Item> {
      self.next_back()
    }
  };
}

/// Tests if two `BitOrder` implementors are the same.
#[inline]
pub fn match_order<O, P>() -> bool
where
  O: BitOrder,
  P: BitOrder,
{
  eq_types::<O, P>()
}

/// Tests if two `BitStore` implementors are the same.
#[inline]
pub fn match_store<T, U>() -> bool
where
  T: BitStore,
  U: BitStore,
{
  eq_types::<T, U>()
}

/// Tests if two `BitSlice` type parameter pairs match each other.
#[inline]
pub fn match_types<T1, O1, T2, O2>() -> bool
where
  O1: BitOrder,
  T1: BitStore,
  O2: BitOrder,
  T2: BitStore,
{
  match_order::<O1, O2>() && match_store::<T1, T2>()
}

/// Tests if a type is known to be an unsigned integer.
///
/// Returns `true` for `u{8,16,32,64,128,size}` and `false` for all others.
#[inline]
pub fn is_unsigned<T>() -> bool
where T: 'static {
  eq_types::<T, u8>()
    || eq_types::<T, u16>()
    || eq_types::<T, u32>()
    || eq_types::<T, u64>()
    || eq_types::<T, u128>()
    || eq_types::<T, usize>()
}

/// Tests if two types are identical, even through different names.
#[inline]
fn eq_types<T, U>() -> bool
where
  T: 'static,
  U: 'static,
{
  TypeId::of::<T>() == TypeId::of::<U>()
}

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Created: 2025-07-18 06:16