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体验新版 GitCode,发现更多精彩内容 >>
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aad53cb6
编写于
7月 26, 2013
作者:
E
Erick Tryzelaar
浏览文件
操作
浏览文件
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电子邮件补丁
差异文件
cleanup .map and .map_err
上级
9dc1de4c
变更
1
隐藏空白更改
内联
并排
Showing
1 changed file
with
33 addition
and
40 deletion
+33
-40
src/libstd/result.rs
src/libstd/result.rs
+33
-40
未找到文件。
src/libstd/result.rs
浏览文件 @
aad53cb6
...
...
@@ -46,45 +46,10 @@ pub fn to_either<T:Clone,U:Clone>(res: &Result<U, T>)
}
}
/**
* Call a function based on a previous result
*
* If `res` is `ok` then the value is extracted and passed to `op` whereupon
* `op`s result is wrapped in `ok` and returned. if `res` is `err` then it is
* immediately returned. This function can be used to compose the results of
* two functions.
*
* Example:
*
* let res = map(read_file(file)) { |buf|
* parse_bytes(buf)
* }
*/
#[inline]
pub
fn
map
<
T
,
E
:
Clone
,
U
:
Clone
>
(
res
:
&
Result
<
T
,
E
>
,
op
:
&
fn
(
&
T
)
->
U
)
->
Result
<
U
,
E
>
{
match
*
res
{
Ok
(
ref
t
)
=>
Ok
(
op
(
t
)),
Err
(
ref
e
)
=>
Err
((
*
e
)
.clone
())
}
}
/**
* Call a function based on a previous result
*
* If `res` is `err` then the value is extracted and passed to `op` whereupon
* `op`s result is wrapped in an `err` and returned. if `res` is `ok` then it
* is immediately returned. This function can be used to pass through a
* successful result while handling an error.
*/
#[inline]
pub
fn
map_err
<
T
:
Clone
,
E
,
F
:
Clone
>
(
res
:
&
Result
<
T
,
E
>
,
op
:
&
fn
(
&
E
)
->
F
)
->
Result
<
T
,
F
>
{
match
*
res
{
Ok
(
ref
t
)
=>
Ok
((
*
t
)
.clone
()),
Err
(
ref
e
)
=>
Err
(
op
(
e
))
}
}
impl
<
T
,
E
>
Result
<
T
,
E
>
{
/**
...
...
@@ -229,9 +194,20 @@ pub fn get(&self) -> T {
}
}
/**
* Call a function based on a previous result
*
* If `*self` is `err` then the value is extracted and passed to `op` whereupon
* `op`s result is wrapped in an `err` and returned. if `*self` is `ok` then it
* is immediately returned. This function can be used to pass through a
* successful result while handling an error.
*/
#[inline]
pub
fn
map_err
<
F
:
Clone
>
(
&
self
,
op
:
&
fn
(
&
E
)
->
F
)
->
Result
<
T
,
F
>
{
map_err
(
self
,
op
)
match
*
self
{
Ok
(
ref
t
)
=>
Ok
(
t
.clone
()),
Err
(
ref
e
)
=>
Err
(
op
(
e
))
}
}
}
...
...
@@ -251,9 +227,26 @@ pub fn get_err(&self) -> E {
}
}
/**
* Call a function based on a previous result
*
* If `res` is `ok` then the value is extracted and passed to `op` whereupon
* `op`s result is wrapped in `ok` and returned. if `res` is `err` then it is
* immediately returned. This function can be used to compose the results of
* two functions.
*
* Example:
*
* let res = map(read_file(file)) { |buf|
* parse_bytes(buf)
* }
*/
#[inline]
pub
fn
map
<
U
:
Clone
>
(
&
self
,
op
:
&
fn
(
&
T
)
->
U
)
->
Result
<
U
,
E
>
{
map
(
self
,
op
)
match
*
self
{
Ok
(
ref
t
)
=>
Ok
(
op
(
t
)),
Err
(
ref
e
)
=>
Err
(
e
.clone
())
}
}
}
...
...
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