ceph/src/boost/libs/dll/example/tutorial4/load_self.cpp

   1 // Copyright 2014 Renato Tegon Forti, Antony Polukhin.
   2 // Copyright 2015-2019 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 // MinGW related workaround
   9 #define BOOST_DLL_FORCE_ALIAS_INSTANTIATION
  10
  11 //[plugcpp_my_plugin_load_self
  12 #include <boost/dll/shared_library.hpp>         // for shared_library
  13 #include <boost/dll/runtime_symbol_info.hpp>    // for program_location()
  14 #include "static_plugin.hpp"                    // without this headers some compilers may optimize out the `create_plugin` symbol
  15 #include <boost/function.hpp>
  16 #include <iostream>
  17
  18 namespace dll = boost::dll;
  19
  20 int main() {
  21     dll::shared_library self(dll::program_location());
  22
  23     std::cout << "Call function" << std::endl;
  24     boost::function<boost::shared_ptr<my_plugin_api>()> creator
  25         = self.get_alias<boost::shared_ptr<my_plugin_api>()>("create_plugin");
  26
  27     std::cout << "Computed Value: " << creator()->calculate(2, 2) << std::endl;
  28     //<-
  29     {
  30         // This block is invisible for Quickbook documentation
  31         float res = creator()->calculate(10, 10);
  32         if (!(res > -0.0001 && res < 0.00001)) {
  33             throw std::runtime_error("Failed check: res > -0.0001 && res < 0.00001");
  34         }
  35     }
  36     //->
  37 }
  38
  39 //]