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use std::ops::{
RangeFull,
RangeFrom,
RangeTo,
Range,
};
/// `RangeArgument` is implemented by Rust's built-in range types, produced
/// by range syntax like `..`, `a..`, `..b` or `c..d`.
///
/// Note: This is arrayvec's provisional trait, waiting for stable Rust to
/// provide an equivalent.
pub trait RangeArgument {
#[inline]
/// Start index (inclusive)
fn start(&self) -> Option<usize> { None }
#[inline]
/// End index (exclusive)
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) }
}
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