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#![cfg_attr(test, deny(warnings))]
#![deny(missing_docs)]
#![cfg_attr(not(feature = "std"), no_std)]
#[cfg(not(feature = "std"))]
mod coreprovider {
extern crate core;
pub use core::{fmt, cmp};
}
#[cfg(feature = "std")]
mod coreprovider {
pub use std::{fmt, cmp, error};
}
use coreprovider::*;
#[derive(Copy)]
pub enum Void { }
impl Clone for Void {
fn clone(&self) -> Void {
unreachable(*self)
}
}
impl fmt::Debug for Void {
fn fmt(&self, _: &mut fmt::Formatter) -> fmt::Result {
unreachable(*self)
}
}
impl fmt::Display for Void {
fn fmt(&self, _: &mut fmt::Formatter) -> fmt::Result {
unreachable(*self)
}
}
impl<T> cmp::PartialEq<T> for Void {
fn eq(&self, _: &T) -> bool {
unreachable(*self)
}
}
impl<T> cmp::PartialOrd<T> for Void {
fn partial_cmp(&self, _: &T) -> Option<cmp::Ordering> {
unreachable(*self)
}
}
#[cfg(feature = "std")]
impl error::Error for Void {
fn description(&self) -> &str {
unreachable(*self)
}
fn cause(&self) -> Option<&error::Error> {
unreachable(*self)
}
}
#[inline(always)]
pub fn unreachable(x: Void) -> ! {
match x {}
}
pub trait ResultVoidExt<T>: Sized {
fn void_unwrap(self) -> T;
}
impl<T> ResultVoidExt<T> for Result<T, Void> {
#[inline]
fn void_unwrap(self) -> T {
match self {
Ok(val) => val,
Err(e) => unreachable(e)
}
}
}
pub trait ResultVoidErrExt<E>: Sized {
fn void_unwrap_err(self) -> E;
}
impl<E> ResultVoidErrExt<E> for Result<Void, E> {
#[inline]
fn void_unwrap_err(self) -> E {
match self {
Ok(v) => unreachable(v),
Err(e) => e
}
}
}