lowerer.cpp

(plain text) 
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#include <algorithm>
#include <functional>
#include <iostream>
#include <string>

std::string &tolower (std::string &s) {
  std::transform(s.begin(), s.end(), s.begin(),
		 std::ptr_fun<int, int>(std::tolower));
  return s;
}

std::string &toupper (std::string &s) {
  std::transform(s.begin(), s.end(), s.begin(),
		 std::ptr_fun<int, int>(std::toupper));
  return s;
}

class lowerer {
public:
  lowerer (std::string &s) : myString(s) { }
  friend std::istream &operator>> (std::istream &is, const lowerer &s) {
    return is >> s.myString;
  }
  ~lowerer () { tolower(myString); }

private:
  std::string &myString;
};

class upperer {
public:
  upperer (std::string &s) : myString(s) { }
  friend std::istream &operator>> (std::istream &is, const upperer &s) {
    return is >> s.myString;
  }
  ~upperer () { toupper(myString); }

private:
  std::string &myString;
};

int main () {
  using namespace std;
  string s;
  cin >> lowerer(s);
  cout << s << endl;
  cin >> upperer(s);
  cout << s << endl;

  return 0;
}