text: 
  // Copyright (C) 2009-2012 Lorenzo Caminiti
  // Distributed under the Boost Software License, Version 1.0
  // (see accompanying file LICENSE_1_0.txt or a copy at
  // http://www.boost.org/LICENSE_1_0.txt)
  // Home at http://www.boost.org/libs/functional/overloaded_function
  
  #include "identity.hpp"
  #include <boost/functional/overloaded_function.hpp>
  #include <boost/core/lightweight_test.hpp>
  
  int main() {
      //[identity_calls
      BOOST_TEST(identity_s("abc") == "abc");
      BOOST_TEST(identity_i(123) == 123);
      BOOST_TEST(identity_d(1.23) == 1.23);
      //]
  
      //[identity_functor
      boost::overloaded_function<
            const std::string& (const std::string&)
          , int (int)
          , double (double)
      > identity(identity_s, identity_i, identity_d);
  
      // All calls via single `identity` function.
      BOOST_TEST(identity("abc") == "abc");
      BOOST_TEST(identity(123) == 123);
      BOOST_TEST(identity(1.23) == 1.23);
      //]
  
      return boost::report_errors();
  }
  
  