ceph/src/boost/libs/dll/example/getting_started.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 #include <boost/core/lightweight_test.hpp>
   9 #include <boost/dll.hpp>
  10 #include <boost/function.hpp>
  11 #include <string>
  12 #include "b2_workarounds.hpp"
  13
  14 // Unit Tests
  15 int main(int argc, char* argv[]) {
  16     using namespace boost;
  17
  18     boost::dll::fs::path path_to_shared_library = b2_workarounds::first_lib_from_argv(argc, argv);
  19     BOOST_TEST(path_to_shared_library.string().find("getting_started_library") != std::string::npos);
  20
  21     //[getting_started_imports_c_function
  22     // Importing pure C function
  23     function<int(int)> c_func = dll::import<int(int)>(
  24             path_to_shared_library, "c_func_name"
  25         );
  26     //]
  27
  28     int c_func_res = c_func(1); // calling the function
  29     BOOST_TEST(c_func_res == 2);
  30
  31
  32     //[getting_started_imports_c_variable
  33     // Importing pure C variable
  34     shared_ptr<int> c_var = dll::import<int>(
  35             path_to_shared_library, "c_variable_name"
  36         );
  37     //]
  38
  39     int c_var_old_contents = *c_var; // using the variable
  40     *c_var = 100;
  41     BOOST_TEST(c_var_old_contents == 1);
  42
  43
  44     //[getting_started_imports_alias
  45     // Importing function by alias name
  46    /*<-*/ function<std::string(const std::string&)> /*->*/ /*=auto*/ cpp_func = dll::import_alias<std::string(const std::string&)>(
  47             path_to_shared_library, "pretty_name"
  48         );
  49     //]
  50
  51     // calling the function
  52     std::string cpp_func_res = cpp_func(std::string("In importer."));
  53     BOOST_TEST(cpp_func_res == "In importer. Hello from lib!");
  54
  55 #if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES) && !defined(BOOST_NO_CXX11_AUTO_DECLARATIONS)
  56     //[getting_started_imports_cpp11_function
  57     // Importing function.
  58     auto cpp11_func = dll::import<int(std::string&&)>(
  59             path_to_shared_library, "i_am_a_cpp11_function"
  60         );
  61     //]
  62
  63     // calling the function
  64     int cpp11_func_res = cpp11_func(std::string("In importer."));
  65     BOOST_TEST(cpp11_func_res == sizeof("In importer.") - 1);
  66 #endif
  67
  68
  69     //[getting_started_imports_cpp_variable
  70     // Importing  variable.
  71     shared_ptr<std::string> cpp_var = dll::import<std::string>(
  72             path_to_shared_library, "cpp_variable_name"
  73         );
  74     //]
  75
  76     std::string cpp_var_old_contents = *cpp_var; // using the variable
  77     *cpp_var = "New value";
  78     BOOST_TEST(cpp_var_old_contents == "some value");
  79     BOOST_TEST(*cpp_var == "New value");
  80
  81     return boost::report_errors();
  82 }
  83