Macro std::macros::reduce

macro reduce($mac, $base, $arg...) { ... }

source

Perform a left-associative fold over the arguments

$mac is a reference to a macro, $base is a mandatory base case followed by a variable number of extra arguments to fold. 

reduce!(m, a1, a2, b3, a4, a5)
// Expands to
m!(m!(m!(m!(a1, a2), a3), a4), a5)

Example

use std::macros::reduce;

macro plus($a, $b) {
    $a + $b
}

assert_eq!(reduce!(plus, 0, 1, 2, 3, 4, 5), 15);
Run this example