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macro_rules! impl_range {
($id:ident, $max:expr, $($a:ident = $b:expr,) *) => (
#[derive(PartialEq, Eq, Clone, Copy)]
#[repr(usize)]
pub enum $id {
$($a = $b, )*
}
impl From<u8> for $id {
#[inline]
fn from(other: u8) -> Self {
assert!(other < $max);
unsafe { transmute(other as usize) }
}
}
impl From<$id> for u8 {
#[inline]
fn from(other: $id) -> u8 {
other as u8
}
}
impl PartialEq<u8> for $id {
#[inline]
fn eq(&self, other: &u8) -> bool {
*self as usize == *other as usize
}
}
impl From<u16> for $id {
#[inline]
fn from(other: u16) -> Self {
assert!(other < $max);
unsafe { transmute(other as usize) }
}
}
impl From<$id> for u16 {
#[inline]
fn from(other: $id) -> u16 {
other as u16
}
}
impl PartialEq<u16> for $id {
#[inline]
fn eq(&self, other: &u16) -> bool {
*self as usize == *other as usize
}
}
impl From<u32> for $id {
#[inline]
fn from(other: u32) -> Self {
assert!(other < $max);
unsafe { transmute(other as usize) }
}
}
impl From<$id> for u32 {
#[inline]
fn from(other: $id) -> u32 {
other as u32
}
}
impl PartialEq<u32> for $id {
#[inline]
fn eq(&self, other: &u32) -> bool {
*self as usize == *other as usize
}
}
impl From<usize> for $id {
#[inline]
fn from(other: usize) -> Self {
assert!(other < $max);
unsafe { transmute(other as usize) }
}
}
impl From<$id> for usize {
#[inline]
fn from(other: $id) -> usize {
other as usize
}
}
impl PartialEq<usize> for $id {
#[inline]
fn eq(&self, other: &usize) -> bool {
*self as usize == *other as usize
}
}
impl From<i32> for $id {
#[inline]
fn from(other: i32) -> Self {
assert!(other >= 0);
assert!(other < $max);
unsafe { transmute(other as usize) }
}
}
impl From<$id> for i32 {
#[inline]
fn from(other: $id) -> i32 {
other as i32
}
}
impl PartialEq<i32> for $id {
#[inline]
fn eq(&self, other: &i32) -> bool {
*self as usize == *other as usize
}
}
impl $id {
#[inline]
/// Returns the primitive representation of the value.
pub fn value(&self) -> usize {
*self as usize
}
#[inline]
/// Constructs the value without a range check.
pub unsafe fn from_u8_unchecked(other: u8) -> Self {
transmute(other as usize)
}
#[inline]
/// Constructs the value without a range check.
pub unsafe fn from_u16_unchecked(other: u16) -> Self {
transmute(other as usize)
}
#[inline]
/// Constructs the value without a range check.
pub unsafe fn from_u32_unchecked(other: u32) -> Self {
transmute(other as usize)
}
#[inline]
/// Constructs the value without a range check.
pub unsafe fn from_usize_unchecked(other: usize) -> Self {
transmute(other as usize)
}
#[inline]
/// Returns the value as an u8.
pub fn into_u8(self) -> u8 {
self as u8
}
#[inline]
/// Returns the value as an u16.
pub fn into_u16(self) -> u16 {
self as u16
}
#[inline]
/// Returns the value as an u32.
pub fn into_u32(self) -> u32 {
self as u32
}
#[inline]
/// Returns the value as an usize.
pub fn into_usize(self) -> usize {
self as usize
}
#[inline]
/// Returns the value as an i32.
pub fn into_i32(self) -> i32 {
self as i32
}
}
impl fmt::Debug for $id {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "0x{:x}", *self as u8)
}
}
impl fmt::Display for $id {
#[inline]
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
(*self as u8).fmt(f)
}
}
impl fmt::LowerHex for $id {
#[inline]
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
(*self as u8).fmt(f)
}
}
)
}
macro_rules! impl_range_from {
($id:ident $(, $other:ident)* ) => (
$(
impl From<$other> for $id {
#[inline]
fn from(other: $other) -> Self {
unsafe { transmute(other as usize) }
}
}
)*
)
}