Common Uses

Flags

Flags are single-bit independent data that are kept together in the same variable. As they are only one bit wide each, they are suitable for representing binary concepts like enabled/disabled, valid/invalid, etc.

We sometimes encounter such one-bit concepts in D modules that are based on C libraries.

Flags are usually defined as non-overlapping values of an enum type.

As an example, let’s consider a car racing game where the realism of the game is configurable:

• The fuel consumption is realistic or not.

• Collisions can damage the cars or not. ...