const std = @import("std");
const assert = std.debug.assert;

const BitField = packed struct {
    a: u3,
    b: u3,
    c: u2,
};

test "bit field access" {
    var data: BitField = .{ .a = 1, .b = 2, .c = 3 };
    assert(data.a == 1);
    assert(deref(&data.b) == 2);
    assert(data.c == 3);
    comptime assert(@sizeOf(BitField) == 1);

    data.b += 1;
    assert(data.b == 3);

    data.a += 1;
    assert(data.a == 2);
    assert(data.b == 3);
}

fn deref(ptr: var) u3 {
    std.debug.warn("\n{}\n", .{@typeName(@TypeOf(ptr))});
    return ptr.*;
}