Expand description
Tools to compose functions.
This library exports two macros, compose_expr
and compose_fn
,
which allow to easily compose expressions and functions respectively.
They both support right-to-left and left-to-right composition:
- right-to-left composition is achieved by separating the arguments with
,
; - left-to-right composition is achieved by separating the arguments with
=>
.
Examples
use composing::*;
fn plus_one(x: i32) -> i32 { x + 1 }
fn times_two(x: i32) -> i32 { x * 2 }
fn to_string(x: i32) -> String { x.to_string() }
let composition = compose_fn!(to_string, plus_one, times_two);
assert_eq!(composition(17), "35");
let composition = compose_fn!(times_two => plus_one => to_string);
assert_eq!(composition(17), "35");
Macros
- Macro to compose expressions.
- Macro to compose functions.