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crate::do_impl!("option", tuple_option, {
/// The resulting tuple when all elements are wrapped in [Option].
///
/// ```
/// use same_types::assert_same_types;
/// use tupleops::OptionTuple;
///
/// assert_same_types!(
/// OptionTuple<(u8, u16, u32)>,
/// (Option<u8>, Option<u16>, Option<u32>),
/// );
/// ```
///
/// See also: [option_tuple()], [TupleOption].
#[cfg_attr(docsrs, doc(cfg(feature = "option")))]
pub type OptionTuple<Tpl> = <Tpl as TupleOption<Tpl>>::Type;
/// Element-wise wrap the element of a tuple in [Option].
///
/// ```
/// use tupleops::option_tuple;
///
/// assert_eq!(
/// option_tuple(Some((1, 2, 3))),
/// (Some(1), Some(2), Some(3)),
/// );
///
/// assert_eq!(
/// option_tuple(Option::<(u8, u16, u32)>::None),
/// (None, None, None),
/// );
/// ```
///
/// See also: [OptionTuple], [TupleOption].
#[cfg_attr(docsrs, doc(cfg(feature = "option")))]
#[inline(always)]
pub fn option_tuple<Tpl>(tpl: Option<Tpl>) -> OptionTuple<Tpl>
where
Tpl: TupleOption<Tpl>,
{
<Tpl as TupleOption<Tpl>>::option_tuple(tpl)
}
/// A tuple that is usable with [option_tuple()].
///
/// See also: [option_tuple()], [OptionTuple].
#[cfg_attr(docsrs, doc(cfg(feature = "option")))]
pub trait TupleOption<Tpl> {
#[doc(hidden)]
type Type;
#[doc(hidden)]
fn option_tuple(tpl: Option<Tpl>) -> Self::Type;
}
impl TupleOption<()> for () {
type Type = ();
fn option_tuple(tpl: Option<()>) -> Self::Type {
let _ = tpl;
}
}
});