1 // Copyright 2015 The Rust Project Developers. See the COPYRIGHT
2 // file at the top-level directory of this distribution and at
3 // http://rust-lang.org/COPYRIGHT.
5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
8 // option. This file may not be copied, modified, or distributed
9 // except according to those terms.
11 #![unstable(feature = "collections_range",
12 reason
= "waiting for dust to settle on inclusive ranges",
17 use core
::option
::Option
::{self, None, Some}
;
18 use core
::ops
::{RangeFull, Range, RangeTo, RangeFrom}
;
20 /// **RangeArgument** is implemented by Rust's built-in range types, produced
21 /// by range syntax like `..`, `a..`, `..b` or `c..d`.
22 pub trait RangeArgument
<T
> {
23 /// Start index (inclusive)
25 /// Return start value if present, else `None`.
26 fn start(&self) -> Option
<&T
> {
30 /// End index (exclusive)
32 /// Return end value if present, else `None`.
33 fn end(&self) -> Option
<&T
> {
38 // FIXME add inclusive ranges to RangeArgument
40 impl<T
> RangeArgument
<T
> for RangeFull {}
42 impl<T
> RangeArgument
<T
> for RangeFrom
<T
> {
43 fn start(&self) -> Option
<&T
> {
48 impl<T
> RangeArgument
<T
> for RangeTo
<T
> {
49 fn end(&self) -> Option
<&T
> {
54 impl<T
> RangeArgument
<T
> for Range
<T
> {
55 fn start(&self) -> Option
<&T
> {
58 fn end(&self) -> Option
<&T
> {