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/local_function
  
  #include <boost/config.hpp>
  #ifdef BOOST_NO_VARIADIC_MACROS
  #   error "variadic macros required"
  #else
  
  #include <boost/local_function.hpp>
  #include <boost/functional/overloaded_function.hpp> // For overloading.
  #include <boost/typeof/std/string.hpp>
  #include <boost/detail/lightweight_test.hpp>
  #include <string>
  
  //[overload_decl
  int add_i(int x, int y) { return x + y; }
  //]
  
  int main(void) {
      //[overload
      std::string s = "abc";
      std::string BOOST_LOCAL_FUNCTION(
              const bind& s, const std::string& x) {
          return s + x;
      } BOOST_LOCAL_FUNCTION_NAME(add_s)
  
      double d = 1.23;
      double BOOST_LOCAL_FUNCTION(const bind d, double x, double y, default 0) {
          return d + x + y;
      } BOOST_LOCAL_FUNCTION_NAME(add_d)
      
      boost::overloaded_function<
            std::string (const std::string&)
          , double (double)
          , double (double, double) // Overload giving default param.
          , int (int, int)
      > add(add_s, add_d, add_d, add_i); // Overloaded function object.
  
      BOOST_TEST(add("xyz") == "abcxyz"); // Call `add_s`.
      BOOST_TEST((4.44 - add(3.21)) <= 0.001); // Call `add_d` (no default).
      BOOST_TEST((44.44 - add(3.21, 40.0)) <= 0.001); // Call `add_d`.
      BOOST_TEST(add(1, 2) == 3); // Call `add_i`.
      //]
      return boost::report_errors();
  }
  
  #endif // VARIADIC_MACROS
  
  