null created by danieluranga - https://repl.it/HkrZ/0

HkrZ-0.cpp

enum Id
{
  A, B, C, D
};

struct Data
{
  Id id;
  const char* val;
};

const Data arr[] =
{
  {A, "test"},
  {B, "otra cosa"}
};

constexpr Data* findById(Id id, Data* arrPtr)
{
  static_assert(arrPtr <= arr + 1, "");
  return id == arrPtr->id ? arrPtr : findById(id, arrPtr + 1);
}

int main()
{
  
}