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use std::ops::{Range, RangeFrom, RangeFull, RangeTo};
/// **RangeArgument** is implemented by Rust's built-in range types, produced
/// by range syntax like `..`, `a..`, `..b` or `c..d`.
pub trait RangeArgument<T = usize> {
#[inline]
/// Start index (inclusive)
fn start(&self) -> Option<T> {
None
}
#[inline]
/// End index (exclusive)
fn end(&self) -> Option<T> {
None
}
}
impl<T> RangeArgument<T> for RangeFull {}
impl<T: Copy> RangeArgument<T> for RangeFrom<T> {
#[inline]
fn start(&self) -> Option<T> {
Some(self.start)
}
}
impl<T: Copy> RangeArgument<T> for RangeTo<T> {
#[inline]
fn end(&self) -> Option<T> {
Some(self.end)
}
}
impl<T: Copy> RangeArgument<T> for Range<T> {
#[inline]
fn start(&self) -> Option<T> {
Some(self.start)
}
#[inline]
fn end(&self) -> Option<T> {
Some(self.end)
}
}