Macro define_huffman_tree

macro_rules! define_huffman_tree {
    ($name:ident : $type:ty = $nodes:tt) => { ... };
}

Defines a new Huffman tree for reading and writing

Its syntax is: define_huffman_tree!(name : type = nodes) where name is some identifier to identify the tree in the macro’s current scope, type is the tree’s output type (which should implement Copy and Eq), and nodes is either a final leaf value or a [bit_0, bit_1] pair where bit_0 is the tree visited on a 0 bit, and bit_1 is the tree visited on a 1 bit.

Example

use bitstream_io::{define_huffman_tree, huffman::FromBits};
define_huffman_tree!(TreeName : &'static str = ["bit 0", ["bit 1->0", "bit 1->1"]]);
let mut bits = [true, false].iter().copied();
assert_eq!(TreeName::from_bits(|| bits.next().ok_or(())).unwrap(), "bit 1->0");