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libs/dll/example/tutorial1/my_plugin_sum.cpp

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+// Copyright 2014 Renato Tegon Forti, Antony Polukhin.
+// Copyright 2015-2019 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 <iostream>
+
+
+//[plugcpp_my_plugin_sum
+#include <boost/config.hpp> // for BOOST_SYMBOL_EXPORT
+#include "../tutorial_common/my_plugin_api.hpp"
+
+namespace my_namespace {
+
+class my_plugin_sum : public my_plugin_api {
+public:
+    my_plugin_sum() {
+        std::cout << "Constructing my_plugin_sum" << std::endl;
+    }
+
+    std::string name() const {
+        return "sum";
+    }
+
+    float calculate(float x, float y) {
+        return x + y;
+    }
+   
+    ~my_plugin_sum() {
+        std::cout << "Destructing my_plugin_sum ;o)" << std::endl;
+    }
+};
+
+// Exporting `my_namespace::plugin` variable with alias name `plugin`
+// (Has the same effect as `BOOST_DLL_ALIAS(my_namespace::plugin, plugin)`)
+extern "C" BOOST_SYMBOL_EXPORT my_plugin_sum plugin;
+my_plugin_sum plugin;
+
+} // namespace my_namespace
+
+//]

libs/dll/example/tutorial1/tutorial1.cpp

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+// Copyright 2014 Renato Tegon Forti, Antony Polukhin.
+// Copyright 2015-2019 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" // contains dll_test::replace_with_full_path
+
+//[callplugcpp_tutorial1
+#include <boost/dll/import.hpp> // for import_alias
+#include <iostream>
+#include "../tutorial_common/my_plugin_api.hpp"
+
+namespace dll = boost::dll;
+
+int main(int argc, char* argv[]) {
+    /*<-*/ b2_workarounds::argv_to_path_guard guard(argc, argv); /*->*/
+    boost::dll::fs::path lib_path(argv[1]);             // argv[1] contains path to directory with our plugin library
+    boost::shared_ptr<my_plugin_api> plugin;            // variable to hold a pointer to plugin variable
+    std::cout << "Loading the plugin" << std::endl;
+     
+    plugin = dll::import<my_plugin_api>(          // type of imported symbol is located between `<` and `>`
+        lib_path / "my_plugin_sum",                     // path to the library and library name
+        "plugin",                                       // name of the symbol to import
+        dll::load_mode::append_decorations              // makes `libmy_plugin_sum.so` or `my_plugin_sum.dll` from `my_plugin_sum`
+    );
+
+    std::cout << "plugin->calculate(1.5, 1.5) call:  " << plugin->calculate(1.5, 1.5) << std::endl;
+}
+//]