[DEV] add v1.66.0

libs/dll/example/tutorial6/on_unload_lib.cpp

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+// Copyright 2014 Renato Tegon Forti, Antony Polukhin.
+// Copyright 2015 Antony Polukhin.
+//
+// Distributed under the Boost Software License, Version 1.0.
+// (See accompanying file LICENSE_1_0.txt
+// or copy at http://www.boost.org/LICENSE_1_0.txt)
+
+// MinGW related workaround
+#define BOOST_DLL_FORCE_ALIAS_INSTANTIATION
+
+//[plugcpp_on_unload
+#include <boost/dll/alias.hpp> // for BOOST_DLL_ALIAS
+#include <boost/function.hpp>
+#include <vector>
+
+namespace my_namespace {
+
+struct on_unload {
+    typedef boost::function<void()> callback_t;
+    typedef on_unload this_type;
+
+    ~on_unload() {
+        for (std::size_t i = 0; i < callbacks_.size(); ++i) {
+            callback_t& function = callbacks_[i];
+            function(); // calling the callback
+        }
+    }
+
+    // not thread safe
+    static void add(const callback_t& function) {
+        static this_type instance;
+        instance.callbacks_.push_back(function);
+    }
+
+private:
+    std::vector<callback_t> callbacks_;
+    on_unload() {} // prohibit construction outside of the `add` function
+};
+
+// Exporting the static "add" function with name "on_unload"
+BOOST_DLL_ALIAS(my_namespace::on_unload::add, on_unload)
+
+} // namespace my_namespace
+
+//]
+
+
+

libs/dll/example/tutorial6/tutorial6.cpp

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+// Copyright 2014 Renato Tegon Forti, Antony Polukhin.
+// Copyright 2015 Antony Polukhin.
+//
+// Distributed under the Boost Software License, Version 1.0.
+// (See accompanying file LICENSE_1_0.txt
+// or copy at http://www.boost.org/LICENSE_1_0.txt)
+
+#include "../b2_workarounds.hpp"
+
+//[callplugcpp_tutorial6
+#include <boost/dll/import.hpp>
+#include <boost/function.hpp>
+#include <iostream>
+
+typedef boost::function<void()> callback_t;
+
+void print_unloaded() {
+    std::cout << "unloaded" << std::endl;
+}
+
+int main(int argc, char* argv[]) {
+    // argv[1] contains full path to our plugin library
+    boost::filesystem::path shared_library_path = /*<-*/ b2_workarounds::first_lib_from_argv(argc, argv); /*->*/ //=argv[1];
+
+    // loading library and getting a function from it
+    boost::function<void(const callback_t&)> on_unload
+        = boost::dll::import_alias<void(const callback_t&)>(
+            shared_library_path, "on_unload"
+        );
+
+    on_unload(&print_unloaded); // adding a callback
+    std::cout << "Before library unload." << std::endl;
+
+    // Releasing last reference to the library, so that it gets unloaded
+    on_unload.clear();
+    std::cout << "After library unload." << std::endl;
+}
+//]
+