do-while

A simple Rust macro for wriing clean 'do-while' loops.

Examples

A standard do-while loop: rust let mut x = 0; do_while! { do { x += 1; } while x < 10; } assert_eq!(x, 10);

'Do-while-do' loops are also supported, running a block of code before the condition is evaluated and another block after the condition is evaluated. This is useful for things like formatting lists: ```rust let items = vec![1, 2, 3, 4]; let mut string = String::new();

let mut index: usize = 0; dowhile! { do { string.push(items[index].tostring); index += 1; } while index < items.len(), do { string.push(", "); } }

asserteq!(string, "1, 2, 3, 4".tostring()); ```

Multiple do-while and do-while-do loops can be mixed and matched in the same macro invocation: ```rust let mut x = 0; let mut y = 0;

let list = vec![5, 6, 7, 8]; let mut string = String::new(); let mut index: usize = 0;

do_while! { do { x += 1; } while x < 10;

do {
    y -= 1;
} while y > -20;

do {
    string.push_str(&list[index].to_string());
    index += 1;
} while index < list.len(), do {
    string.push_str(", ");
}

}

asserteq!(x, 10); asserteq!(y, -20); asserteq!(string, "5, 6, 7, 8".tostring()); ```