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

   1 // Copyright 2014 Renato Tegon Forti, Antony Polukhin.
   2 // Copyright 2015-2016 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 #include <boost/dll.hpp>
  12 #include <string>
  13
  14 #ifdef BOOST_NO_CXX11_NOEXCEPT
  15 #define noexcept
  16 #endif
  17
  18 #define API extern "C" BOOST_SYMBOL_EXPORT
  19
  20 #ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
  21 //[getting_started_exports_cpp11_function
  22 namespace some_namespace {
  23     API int i_am_a_cpp11_function(std::string&& param) noexcept;
  24 //          ^--------------------  function name to use in dll::import<>
  25 }
  26 //]
  27 #endif
  28
  29
  30 //[getting_started_exports_cpp_variable
  31 namespace your_project_namespace {
  32     API std::string cpp_variable_name;
  33 }
  34 //]
  35
  36
  37
  38 //[getting_started_exports_alias
  39 namespace some_namespace {
  40     std::string i_am_function_with_ugly_name(const std::string& param) noexcept;
  41 }
  42
  43 // When you have no control over function sources or wish to specify another name.
  44 BOOST_DLL_ALIAS(some_namespace::i_am_function_with_ugly_name, pretty_name)
  45 //]
  46
  47 //[getting_started_exports_c_function
  48 API int c_func_name(int);
  49 //]
  50
  51 //[getting_started_exports_c_variable
  52 API int c_variable_name;
  53 //]
  54
  55 int c_func_name(int i) { return ++i; }
  56 int c_variable_name = 1;
  57 std::string your_project_namespace::cpp_variable_name = "some value";
  58
  59 namespace some_namespace {
  60     std::string i_am_function_with_ugly_name(const std::string& param) noexcept {
  61         return param + " Hello from lib!";
  62     }
  63
  64 #ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
  65     int i_am_a_cpp11_function(std::string&& param) noexcept {
  66         return static_cast<int>(param.size());
  67     }
  68 #endif
  69 }
  70