Function split_v_n 

pub fn split_v_n<const N: usize>(
    area: Rect,
    constraints: [Constraint; N],
) -> [Rect; N]

Split area into stacked rows top-to-bottom, like split_v, but sized to a compile-time pane count N: takes [Constraint; N] and returns [Rect; N] instead of allocating a Vec.

The array length ties the constraint count to the return type, so a caller that destructures the result (let [header, body, footer] = split_v_n(area, [..]);) gets a compile error if it adds or removes a constraint without updating the destructuring pattern, rather than a silently out-of-sync index into a Vec. Never allocates, for any N.

Never panics, for the same reason as split_v.

Examples

use retroglyph_core::grid::Rect;
use retroglyph_ui::{Constraint, split_v_n};

let area = Rect::new(0, 0, 20, 10);
let [header, body, footer] =
    split_v_n(area, [Constraint::Fixed(1), Constraint::Fill(1), Constraint::Fixed(1)]);
assert_eq!((header.height(), body.height(), footer.height()), (1, 8, 1));