NO_PIN

fl::u8 NO_PIN = 255

constexpr

Constant for "not a pin".

Deliberately a constant and not a macro. As #define NO_PIN 255 this replaced the token everywhere the preprocessor saw it, so any other library that used NO_PIN as an identifier – an enumerator, a class member, a local – failed to compile purely because FastLED.h had been included first. Reported as FastLED#893.

A constant obeys normal scoping instead. A colliding declaration inside another namespace, a class, or a function simply shadows this one, which is what the authors of that code expected. (A second declaration at global scope still conflicts – unqualified lookup finds both and reports an ambiguity – but that is an ordinary, diagnosable name clash rather than the preprocessor rewriting a token it had no business touching.)

Kept at namespace scope under the original spelling rather than deleted, so sketches that already reference NO_PIN continue to build. Nothing inside FastLED uses it.

Definition at line 38 of file fastpin.h.