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#[macro_export]
macro_rules! index_struct {
($v:vis struct $n:ident {
$vf:vis value: usize,
}) => {
#[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
$v struct $n {
$vf value: usize,
}
impl $n {
#[allow(dead_code)]
$v fn get_and_increment(&mut self) -> Self {
let old_value = *self;
self.value += 1;
old_value
}
#[allow(dead_code)]
$v fn increment(&mut self) {
self.value += 1;
}
}
impl ::std::fmt::Debug for $n {
fn fmt(&self, fmt: &mut ::std::fmt::Formatter) -> Result<(), ::std::fmt::Error> {
write!(fmt, "{}({})", stringify!($n), self.value)
}
}
impl ::std::iter::Step for $n {
fn steps_between(start: &Self, end: &Self) -> Option<usize> {
usize::steps_between(&start.value, &end.value)
}
fn replace_one(&mut self) -> Self {
Self {
value: usize::replace_one(&mut self.value),
}
}
fn replace_zero(&mut self) -> Self {
Self {
value: usize::replace_zero(&mut self.value),
}
}
fn add_one(&self) -> Self {
Self {
value: usize::add_one(&self.value),
}
}
fn sub_one(&self) -> Self {
Self {
value: usize::sub_one(&self.value),
}
}
fn add_usize(&self, n: usize) -> Option<Self> {
usize::add_usize(&self.value, n).map(|value| Self { value })
}
}
impl From<usize> for $n {
fn from(value: usize) -> Self {
Self { value: value }
}
}
}
}