Making a lookup table

map.cpp

// -*- compile-command: "clang++ -std=c++1y map.cpp -o map" -*-

#include <map>
#include <string>
#include <iostream>

class NoteLookup {
 private:
  std::map<std::string, double> lookup;
 public:
  NoteLookup () 
      : lookup {
          { "C", 440.0 },
          { "D", 480.0 },
          { "E", 520.0 },
        }
  {
  }


  bool isNote (const std::string& s) {
    auto found = lookup . find (s);
    return found != lookup . end ();
  }

  double noteValue (const std::string& s) {
    auto found = lookup . find (s);
    return found == lookup . end () ? 0.0 : found -> second;
  }
    
};

int main (int argc, char **argv) {
  NoteLookup note_lookup;
  for (int i = 1; i < argc; ++i) {
    std::string note { argv[i] };
    if (note_lookup . isNote (note)) {
      std::cout << note << ": " << note_lookup . noteValue (note) << "\n";
    } else {
      std::cout << note << ": ???\n";
    }
  }

  return 0;
}