Generate a random number, but disallow the previous result.

myRandom.cpp

/* Generate a random number, but disallow the previous result.
 *
 * \param low
 * \param high
 *
 * \return Random number.
 */
long myRandom(long const low, long const high) {
  thread_local long previousValue {random(low, high)};
  
  long value {random(low, high - 1)};
  if (value >= previousValue) {
    value++;
  } 
  previousValue = value;
  
  return value;
}