// unordered_set::find
#include <iostream>
#include <string>
#include <unordered_set>

template<typename T>
void print_set(std::unordered_set<T>& myset) {
  std::cout << "myset contains:";
  for (auto it=myset.begin(); it!=myset.end(); ++it)
    std::cout << ' ' << *it;
  std::cout << '\n';
}

int main () {
  std::unordered_set<std::string> myset;
  std::unordered_set<std::string>::iterator it;
  std::string word[] = { "sugar", "choco", "milk", "banana", "coffee" };

  // unordered_set some initial values:
  for (int i=0; i<5; i++) 
    myset.emplace(word[i]); 
  
  print_set(myset);
  
  it=myset.find(std::string("biscuits"));
  if(it != myset.end()) {
    myset.erase (it);
    std::cout << "'biscuits' erased\n";
  }
  else 
    std::cout << "'biscuits' not found\n";
  
  print_set(myset);
  myset.erase (myset.find(std::string("milk")));
  std::cout << "'milk' erased\n";
  print_set(myset);

  return 0;
}