use fid_rs::Fid;

let fid = Fid::from("0100_1");  // Tips: Fid::from::<&str>() ignores '_'.

// Basic operations ---------------------
assert_eq!(fid[0], false);  // [0]1001; 0th bit is '0' (false)
assert_eq!(fid[1], true);   // 0[1]001; 1st bit is '1' (true)
assert_eq!(fid[4], true);   // 0100[1]; 4th bit is '1' (true)

assert_eq!(fid.rank(0), 0);  // [0]1001; Range [0, 0] has no '1'
assert_eq!(fid.rank(3), 1);  // [0100]1; Range [0, 3] has 1 '1'
assert_eq!(fid.rank(4), 2);  // [01001]; Range [0, 4] has 2 '1's

assert_eq!(fid.select(0), Some(0)); // []01001; Minimum i where range [0, i] has 0 '1's is i=0
assert_eq!(fid.select(1), Some(1)); // 0[1]001; Minimum i where range [0, i] has 1 '1's is i=1
assert_eq!(fid.select(2), Some(4)); // 0100[1]; Minimum i where range [0, i] has 2 '1's is i=4
assert_eq!(fid.select(3), None);    // There is no i where range [0, i] has 3 '1's

// rank0, select0 -----------------------
assert_eq!(fid.rank0(0), 1);  // [0]1001; Range [0, 0] has no '0'
assert_eq!(fid.rank0(3), 3);  // [0100]1; Range [0, 3] has 3 '0's
assert_eq!(fid.rank0(4), 3);  // [01001]; Range [0, 4] has 3 '0's

assert_eq!(fid.select0(0), Some(0)); // []01001; Minimum i where range [0, i] has 0 '0's is i=0
assert_eq!(fid.select0(1), Some(0)); // [0]1001; Minimum i where range [0, i] has 1 '0's is i=0
assert_eq!(fid.select0(2), Some(2)); // 01[0]01; Minimum i where range [0, i] has 2 '0's is i=2
assert_eq!(fid.select0(4), None);    // There is no i where range [0, i] has 4 '0's

use fid_rs::Fid;

// Most human-friendly way: Fid::from::<&str>()
let fid = Fid::from("0100_1");

// Complex construction in simple way: Fid::from::<&[bool]>()
let mut arr = [false; 5];
arr[1] = true;
arr[4] = true;
let fid = Fid::from(&arr[..]);

use fid_rs::Fid;

let fid = Fid::from("0100_1");

for bit in fid.iter() {
    println!("{}", bit);
}
// =>
// false
// true
// false
// false
// true

use fid_rs::Fid;

let fid = Fid::from("0100_1");

assert_eq!(fid.len(), 5);