ceph/src/boost/libs/dll/example/tutorial6/tutorial6.cpp

   1 // Copyright 2014 Renato Tegon Forti, Antony Polukhin.
   2 // Copyright 2015 Antony Polukhin.
   3 //
   4 // Distributed under the Boost Software License, Version 1.0.
   5 // (See accompanying file LICENSE_1_0.txt
   6 // or copy at http://www.boost.org/LICENSE_1_0.txt)
   7
   8 #include "../b2_workarounds.hpp"
   9
  10 //[callplugcpp_tutorial6
  11 #include <boost/dll/import.hpp>
  12 #include <boost/function.hpp>
  13 #include <iostream>
  14
  15 typedef boost::function<void()> callback_t;
  16
  17 void print_unloaded() {
  18     std::cout << "unloaded" << std::endl;
  19 }
  20
  21 int main(int argc, char* argv[]) {
  22     // argv[1] contains full path to our plugin library
  23     boost::filesystem::path shared_library_path = /*<-*/ b2_workarounds::first_lib_from_argv(argc, argv); /*->*/ //=argv[1];
  24
  25     // loading library and getting a function from it
  26     boost::function<void(const callback_t&)> on_unload
  27         = boost::dll::import_alias<void(const callback_t&)>(
  28             shared_library_path, "on_unload"
  29         );
  30
  31     on_unload(&print_unloaded); // adding a callback
  32     std::cout << "Before library unload." << std::endl;
  33
  34     // Releasing last reference to the library, so that it gets unloaded
  35     on_unload.clear();
  36     std::cout << "After library unload." << std::endl;
  37 }
  38 //]
  39