strafe-project/fixed_wide_vectors/src/macros/wide.rs

#[doc(hidden)]
#[macro_export(local_inner_macros)]
macro_rules! impl_wide_operations {
	( $struct: ident { $($field: ident), + }, $size: expr ) => {
		impl<U,T:Copy+fixed_wide_traits::wide::WideMul<Output=U>> fixed_wide_traits::wide::WideMul for $struct<T> {
			type Output=$struct<U>;
			#[inline]
			fn wide_mul(self, rhs: Self) -> Self::Output {
				$struct{
					$( $field: self.$field.wide_mul(rhs.$field) ), +
				}
			}
		}
		impl<V:core::ops::Add<Output=V>,U,T:fixed_wide_traits::wide::WideMul<U,Output=V>> fixed_wide_traits::wide::WideDot<$struct<U>> for $struct<T> {
			type Output=V;
			#[inline]
			fn wide_dot(self, rhs: $struct<U>) -> Self::Output {
				$crate::sum_repeating!(
					$( + (self.$field.wide_mul(rhs.$field)) ) +
				)
			}
		}
		impl<U:std::ops::Add<Output=U>,T:Copy+fixed_wide_traits::wide::WideMul<Output=U>> $struct<T> {
			#[inline]
			pub fn wide_length_squared(&self) -> U {
				$crate::sum_repeating!(
					$( + self.$field.wide_mul(self.$field) ) +
				)
			}
		}
	};
}


// HACK: Allows us to sum repeating tokens in macros.
// See: https://stackoverflow.com/a/60187870/17452730
#[doc(hidden)]
#[macro_export(local_inner_macros)]
macro_rules! sum_repeating {
	( + $($item: tt) * ) => {
		$($item) *
	};
}