[DEV] add v1.66.0

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;
+}
+//]
+