use std::ops::{
RangeFull,
RangeFrom,
RangeTo,
Range,
};
pub trait RangeArgument {
#[inline]
fn start(&self) -> Option<usize> { None }
#[inline]
fn end(&self) -> Option<usize> { None }
}
impl RangeArgument for RangeFull {}
impl RangeArgument for RangeFrom<usize> {
#[inline]
fn start(&self) -> Option<usize> { Some(self.start) }
}
impl RangeArgument for RangeTo<usize> {
#[inline]
fn end(&self) -> Option<usize> { Some(self.end) }
}
impl RangeArgument for Range<usize> {
#[inline]
fn start(&self) -> Option<usize> { Some(self.start) }
#[inline]
fn end(&self) -> Option<usize> { Some(self.end) }
}