Pipe Trait
Make it possible to chain regular functions.
APIs
By adding use pipe_trait::*, 9 methods are added to all types:
| identifier | pipe syntax | traditional syntax |
|---|---|---|
Pipe::pipe |
x.pipe(f) |
f(x) |
Pipe::pipe_ref |
x.pipe_ref(f) |
f(&x) |
Pipe::pipe_mut |
x.pipe_mut(f) |
f(&mut x) |
Pipe::pipe_as_ref |
x.pipe_as_ref(f) |
f(x.as_ref()) |
Pipe::pipe_as_mut |
x.pipe_as_mut(f) |
f(x.as_mut()) |
Pipe::pipe_deref |
x.pipe_deref(f) |
f(&x) |
Pipe::pipe_deref_mut |
x.pipe_deref_mut(f) |
f(&mut x) |
Pipe::pipe_borrow |
x.pipe_borrow(f) |
f(x.borrow()) |
Pipe::pipe_borrow_mut |
x.pipe_borrow_mut(f) |
f(x.borrow_mut()) |
Read the docs for more information.
Usage Examples
Same type
use pipe_trait::*;
let inc = |x| x + 1;
let double = |x| x + x;
let square = |x| x * x;
let a = (123i32).pipe(inc).pipe(double).pipe(square);
let b = square(double(inc(123i32)));
assert_eq!(a, b);Type transformation
use pipe_trait::*;
let x = 'x';
let a = x
.pipe(|x| (x, x, x)) // (char, char, char)
.pipe(|x| [x, x]) // [(char, char, char); 2]
.pipe(|x| format!("{:?}", x)); // String
let b = "[('x', 'x', 'x'), ('x', 'x', 'x')]";
assert_eq!(a, b);Pipe amongst method chain
use pipe_trait::*;
fn log<X: Debug>(x: X) -> X {
println!("value: {:?}", x);
x
}
my_future
.pipe(log)
.await
.pipe(log)
.inc()
.pipe(log)
.double()
.pipe(log)
.square()
.pipe(log)
.get()
.pipe(log);Explicit type annotation
use pipe_trait::*;
let x = "abc".to_string();
let a = x
.pipe_ref::<&str, _>(AsRef::as_ref)
.chars()
.pipe::<Box<_>, _>(Box::new)
.collect::<Vec<_>>();
let b = vec!['a', 'b', 'c'];
assert_eq!(a, b);