Declaring enum as loop boundary

Question

I recently received some (closed source) third-party code to work with. While scrolling through all the classes (c++) I found some interesting snippet that I've never seen anyone doing before.

void ns::somefunc() {
  enum { MAX_ATTEMPS = 5 }; // why not 'const int max_attemps = 5;'?
  for (int i = 0; i < MAX_ATTEMPS; ++i) {
    /* some code without reference to MAX_ATTEMPS or i */
  }
}

I've never seen this, why would one create an unnamed enum - within a function - with a single enumerator set to a specific value instead just using const int max_attemps = 5;? Especially since neither i nor MAX_ATTEMPS are used inside the loop or anywhere else in the functions scope.