rustr/
result.rs

1//! Safe unwrap for R ffi
2//!
3use ::traits::*;
4
5use std::result::Result::{self, Ok, Err};
6use std::option::Option::{self, Some, None};
7
8
9impl<T: Empty, E> Gettable for Result<T, E> {
10    type Res=T;
11    /// Safely unwraps a Result, yielding the content of an `Ok`.
12    ///
13    /// # Examples
14    ///
15    /// ```txt
16    /// let x: Rresult<u32, &str> = Ok(2);
17    /// assert_eq!(x.unwrap(), 2);
18    /// ```
19    ///
20    /// ```txt
21    /// let x: Rresult<u32, &str> = Err("emergency failure");
22    /// x.get();
23    /// ```
24    #[inline]
25    fn get(self) -> T {
26        match self {
27            Ok(t) => t,
28            Err(_) => T::empty(),
29            // panic!("called `Rresult::unwrap()` on an `Err` value: {:?}", e)
30        }
31    }
32}
33
34impl<T, E: Empty> ErrGettable for Result<T, E> {
35    type Res=E;
36    /// Safely unwraps a Result, yielding the content of an `Err`.
37    ///
38    /// # Examples
39    ///
40    /// ```txt
41    /// let x: Rresult<u32, &str> = Ok(2);
42    /// x.get_err(); 
43    /// ```
44    ///
45    /// ```txt
46    /// let x: Rresult<u32, &str> = Err("emergency failure");
47    /// assert_eq!(x.get_err(), "emergency failure");
48    /// ```
49    #[inline]
50    fn get_err(self) -> E {
51        match self {
52            Ok(_) => E::empty(),
53            Err(e) => e,
54        }
55    }
56}
57
58
59impl<T: Empty> Gettable for Option<T> {
60    type Res=T;
61    /// Moves the value `v` out of the `Roption<T>` if it is `Some(v)`.
62    ///
63    /// # Panics
64    ///
65    /// Panics if the self value equals `None`.
66    ///
67    /// # Safety note
68    ///
69    /// In general, because this function may panic, its use is discouraged.
70    /// Instead, prefer to use pattern matching and handle the `None`
71    /// case explicitly.
72    ///
73    /// # Examples
74    ///
75    /// ```txt
76    /// let x = Some("air");
77    /// assert_eq!(x.get(), "air");
78    /// ```
79    ///
80    /// ```txt
81    /// let x: Roption<&str> = None;
82    /// assert_eq!(x.get(), "air"); // fails
83    /// ```
84    #[inline]
85    fn get(self) -> T {
86        match self {
87            Some(val) => val,
88            None => T::empty(),
89        }
90    }
91}
rustr/result.rs

rustr/
result.rs
