macros.rs

/*!
# Utc2k - Macros
*/

/// # Helper: `AsRef` and `Borrow`.
macro_rules! as_ref_borrow_cast {
	($parent:ty: $($cast:ident $ty:ty),+ $(,)?) => ($(
		impl AsRef<$ty> for $parent {
			#[inline]
			fn as_ref(&self) -> &$ty { self.$cast() }
		}

		impl ::std::borrow::Borrow<$ty> for $parent {
			#[inline]
			fn borrow(&self) -> &$ty { self.$cast() }
		}
	)+);
}

/// # Helper: `Display`.
macro_rules! display_str {
	($cast:ident $ty:ty) => (
		impl ::std::fmt::Display for $ty {
			#[inline]
			fn fmt(&self, f: &mut ::std::fmt::Formatter<'_>) -> ::std::fmt::Result {
				f.write_str(self.$cast())
			}
		}
	);
}

/// # Helper: 2-Way `PartialEq`.
macro_rules! partial_eq_cast {
	// Dereference.
	(deref $parent:ty: $($cast:ident $ty:ty),+ $(,)?) => ($(
		impl PartialEq<$ty> for $parent {
			#[inline]
			fn eq(&self, other: &$ty) -> bool { self.$cast() == *other }
		}

		impl PartialEq<$parent> for $ty {
			#[inline]
			fn eq(&self, other: &$parent) -> bool { other.$cast() == *self }
		}
	)+);

	// Plain.
	($parent:ty: $($cast:ident $ty:ty),+ $(,)?) => ($(
		impl PartialEq<$ty> for $parent {
			#[inline]
			fn eq(&self, other: &$ty) -> bool { self.$cast() == other }
		}

		impl PartialEq<$parent> for $ty {
			#[inline]
			fn eq(&self, other: &$parent) -> bool { other.$cast() == self }
		}
	)+);
}

/// # Helper: 2-Way `PartialEq`.
macro_rules! partial_eq_from {
	($parent:ty: $($ty:ty),+ $(,)?) => ($(
		impl PartialEq<$ty> for $parent {
			#[inline]
			fn eq(&self, other: &$ty) -> bool { <$ty>::from(*self).eq(other) }
		}

		impl PartialEq<$parent> for $ty {
			#[inline]
			fn eq(&self, other: &$parent) -> bool { Self::from(*other).eq(self) }
		}
	)+);
}



pub(super) use {
	as_ref_borrow_cast,
	display_str,
	partial_eq_cast,
	partial_eq_from,
};