ceph/src/boost/libs/dll/example/tutorial7/tutorial7.cpp

   1 // Copyright 2014 Renato Tegon Forti, Antony Polukhin.
   2 // Copyright Antony Polukhin, 2015-2022.
   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 <vector>
   9 #include "../b2_workarounds.hpp"
  10
  11 //[callplugcpp_tutorial7
  12 #include <boost/dll/shared_library.hpp>
  13 #include <boost/dll/library_info.hpp>
  14 #include <iostream>
  15
  16 void load_and_execute(const boost::dll::fs::path libraries[], std::size_t libs_count) {
  17     const std::string username = "User";
  18
  19     for (std::size_t i = 0; i < libs_count; ++i) {
  20         // Class `library_info` can extract information from a library
  21         boost::dll::library_info inf(libraries[i]);
  22
  23         // Getting symbols exported from 'Anna' section
  24         std::vector<std::string> exports = inf.symbols("Anna");
  25
  26         // Loading library and importing symbols from it
  27         boost::dll::shared_library lib(libraries[i]);
  28         for (std::size_t j = 0; j < exports.size(); ++j) {
  29             std::cout << "\nFunction '" << exports[j] << "' prints:\n\t";
  30             lib.get_alias<void(const std::string&)>(exports[j]) // importing function
  31                 (username);                                     // calling function
  32         }
  33     }
  34 }
  35 //]
  36
  37 int main(int argc, char* argv[]) {
  38     /*<-*/ BOOST_ASSERT(argc >= 3); /*->*/
  39     std::vector<boost::dll::fs::path> libraries;
  40     libraries.reserve(argc - 1);
  41     for (int i = 1; i < argc; ++i) {
  42         if (b2_workarounds::is_shared_library(argv[i])) {
  43             libraries.push_back(argv[i]);
  44         }
  45     }
  46
  47     load_and_execute(&libraries[0], libraries.size());
  48 }