     1
     2
     3
     4
     5
     6
     7
     8
     9
    10
    11
    12
    13
    14
    15
    16
    17
    18
    19
    20
    21
    22
    23
    24
    25
    26
    27
    28
    29
    30
    31
    32
    33
    34
    35
    36
    37
    38
    39
    40
    41
    42
    43
    44
    45
    46
    47
    48
    49
    50
    51
    52
    53
    54
    55
    56
    57
    58
    59
    60
    61
    62
    63
    64
    65
    66
    67
    68
    69
    70
    71
    72
    73
    74
    75
    76
    77
    78
    79
    80
    81
    82
    83
    84
    85
    86
    87
    88
    89
    90
    91
    92

    // Copyright 2015 The Rust Project Developers. See the COPYRIGHT
    // file at the top-level directory of this distribution and at
    // http://rust-lang.org/COPYRIGHT.
    //
    // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
    // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
    // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
    // option. This file may not be copied, modified, or distributed
    // except according to those terms.

    #![unstable(feature = "collections_range",
                reason = "waiting for dust to settle on inclusive ranges",
                issue = "30877")]

    //! Range syntax.

    use core::ops::{RangeFull, Range, RangeTo, RangeFrom};

    /// **RangeArgument** is implemented by Rust's built-in range types, produced
    /// by range syntax like `..`, `a..`, `..b` or `c..d`.
    pub trait RangeArgument<T> {
        /// Start index (inclusive)
        ///
        /// Return start value if present, else `None`.
        ///
        /// # Examples
        ///
        /// ```
        /// #![feature(collections)]
        /// #![feature(collections_range)]
        ///
        /// extern crate collections;
        ///
        /// # fn main() {
        /// use collections::range::RangeArgument;
        ///
        /// assert_eq!((..10).start(), None);
        /// assert_eq!((3..10).start(), Some(&3));
        /// # }
        /// ```
        fn start(&self) -> Option<&T> {
            None
        }

        /// End index (exclusive)
        ///
        /// Return end value if present, else `None`.
        ///
        /// # Examples
        ///
        /// ```
        /// #![feature(collections)]
        /// #![feature(collections_range)]
        ///
        /// extern crate collections;
        ///
        /// # fn main() {
        /// use collections::range::RangeArgument;
        ///
        /// assert_eq!((3..).end(), None);
        /// assert_eq!((3..10).end(), Some(&10));
        /// # }
        /// ```
        fn end(&self) -> Option<&T> {
            None
        }
    }

    // FIXME add inclusive ranges to RangeArgument

    impl<T> RangeArgument<T> for RangeFull {}

    impl<T> RangeArgument<T> for RangeFrom<T> {
        fn start(&self) -> Option<&T> {
            Some(&self.start)
        }
    }

    impl<T> RangeArgument<T> for RangeTo<T> {
        fn end(&self) -> Option<&T> {
            Some(&self.end)
        }
    }

    impl<T> RangeArgument<T> for Range<T> {
        fn start(&self) -> Option<&T> {
            Some(&self.start)
        }
        fn end(&self) -> Option<&T> {
            Some(&self.end)
        }
    }

# Help

## Keyboard Shortcuts

?
  Show this help dialog
S
  Focus the search field
⇤
  Move up in search results
⇥
  Move down in search results
⏎
  Go to active search result
+
  Collapse/expand all sections

## Search Tricks

Prefix searches with a type followed by a colon (e.g. `fn:`) to restrict the search to a given type.

Accepted types are: `fn`, `mod`, `struct`, `enum`, `trait`, `type`, `macro`, and `const`.

Search functions by type signature (e.g. `vec -> usize` or `* -> vec`)