Macro expansion across multiple files

Projects Programming
3

econjack:
It works fine. However, if I move the function that uses the macro to a *.cpp file, it fails with the error message:

rather than using macros C++ allows the use of constexpr functions:

#include "test.h"

uint8_t pinSet[] {
  1,2,3,4,5,6,7,8,9,0,11
};

size_t arraySize = NUM_ELEMENTS(sizeof(pinSet), sizeof(pinSet[0]));

void setup() {
  Serial.begin(112500);
  Serial.println(arraySize);
}

void loop() {

}

#ifndef TEST_H
#define TEST_H

constexpr size_t NUM_ELEMENTS(size_t i, size_t k) {
  return i/k;
}

#endif

the arguments must be compile time constants...

Added benefit is that you won't have #define directive collisions.