Struct tear::trait_impl::Maru

pub struct Maru;

A placeholder type with a single value ◯

It mirrors the NoneError type. For example, it is used in conjunction with Moral to represent the bad types for bool or Option<T>.

Examples

Return Maru from the right hand function to return None:

fn f() -> Option<i32> {
    terror! { Some(3) => |_| { println!("Darn"); tear::Maru } };
}

It automatically converts to ():

fn f() -> () {
    tear! { None => |_| tear::Maru }
}

See also

• the gut function, that takes over the right-hand side

Trait Implementations

impl Clone for Maru

fn clone(&self) -> Maru

Returns a copy of the value.

pub fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for Maru

impl Debug for Maru

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl From<()> for Maru

fn from(_: ()) -> Self

Performs the conversion.

impl From<Maru> for ()

fn from(_: Maru)

Performs the conversion.