tiny.zen.HeadingCapacity

1pub const Capacity = struct {2    limits: Limits,3    headings_offset: usize,4    heading_bytes: usize,5    text_offset: usize,6    id_offset: usize,7    storage_bytes: usize,89    pub fn derive(limits: Limits) DeriveError!Capacity {10        const heading_bytes = std.math.mul(11            usize,12            limits.max_headings,13            @sizeOf(model.Heading),14        ) catch return error.CapacityOverflow;15        const id_offset = try added(heading_bytes, limits.max_text_bytes);16        return .{17            .limits = limits,18            .headings_offset = 0,19            .heading_bytes = heading_bytes,20            .text_offset = heading_bytes,21            .id_offset = id_offset,22            .storage_bytes = try added(id_offset, limits.max_id_bytes),23        };24    }25};

1/// Checked one-region byte layout derived from `HeadingLimits`.2pub const HeadingCapacity = document.Capacity;