Zig Academy · Lesson

Bit Fields and Flags

Pack booleans and small fields tightly.

Many Flags, One Byte

Settings are often just on-or-off switches. Packing them as bit fields stores many flags in a single tiny integer.

Inside a packed struct, a bool occupies exactly one bit. Stack several together and they share a single byte.

const Mode = packed struct {
    bold: bool,
    italic: bool,
    underline: bool,
};