| 1 | // Copyright 2014 Renato Tegon Forti, Antony Polukhin. |
|---|---|
| 2 | // Copyright Antony Polukhin, 2015-2024. |
| 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_on_unload |
| 12 | #include <boost/dll/alias.hpp> // for BOOST_DLL_ALIAS |
| 13 | #include <boost/function.hpp> |
| 14 | #include <vector> |
| 15 | |
| 16 | namespace my_namespace { |
| 17 | |
| 18 | struct on_unload { |
| 19 | typedef boost::function<void()> callback_t; |
| 20 | typedef on_unload this_type; |
| 21 | |
| 22 | ~on_unload() { |
| 23 | for (std::size_t i = 0; i < callbacks_.size(); ++i) { |
| 24 | callback_t& function = callbacks_[i]; |
| 25 | function(); // calling the callback |
| 26 | } |
| 27 | } |
| 28 | |
| 29 | // not thread safe |
| 30 | static void add(const callback_t& function) { |
| 31 | static this_type instance; |
| 32 | instance.callbacks_.push_back(x: function); |
| 33 | } |
| 34 | |
| 35 | private: |
| 36 | std::vector<callback_t> callbacks_; |
| 37 | on_unload() {} // prohibit construction outside of the `add` function |
| 38 | }; |
| 39 | |
| 40 | // Exporting the static "add" function with name "on_unload" |
| 41 | BOOST_DLL_ALIAS(my_namespace::on_unload::add, on_unload) |
| 42 | |
| 43 | } // namespace my_namespace |
| 44 | |
| 45 | //] |
| 46 | |
| 47 | |
| 48 | |
| 49 |