arrayvec/src/range.rs at master · Simteract/arrayvec · GitHub

42 lines (34 loc) · 968 Bytes

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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