ceph/src/boost/libs/signals/example/no_function.cpp

   1 // Boost.Signals library
   2
   3 // Copyright Douglas Gregor 2001-2003. Use, modification and
   4 // distribution is subject to the Boost Software License, Version
   5 // 1.0. (See accompanying file LICENSE_1_0.txt or copy at
   6 // http://www.boost.org/LICENSE_1_0.txt)
   7
   8 // For more information, see http://www.boost.org
   9
  10 #include <iostream>
  11 #include <boost/signals/signal2.hpp>
  12 #include <string>
  13 #include <functional>
  14
  15 void print_sum(int x, int y)
  16 {
  17   std::cout << "Sum = " << x+y << std::endl;
  18 }
  19
  20 void print_product(int x, int y)
  21 {
  22   std::cout << "Product = " << x*y << std::endl;
  23 }
  24
  25 void print_quotient(float x, float y)
  26 {
  27   std::cout << "Quotient = " << x/y << std::endl;
  28 }
  29
  30 int main()
  31 {
  32   typedef boost::signal2<void, int, int, boost::last_value<void>,
  33                          std::string, std::less<std::string>,
  34                          void (*)(int, int)> sig_type;
  35
  36   sig_type sig;
  37   sig.connect(&print_sum);
  38   sig.connect(&print_product);
  39
  40   sig(3, 5); // print sum and product of 3 and 5
  41
  42   // should fail
  43   //   sig.connect(&print_quotient);
  44 }