One more example for tutorial

example/tutorial3/tutorial3.cpp

@@ -0,0 +1,61 @@
+// Copyright 2011-2012 Renato Tegon Forti.
+// Copyright 2014 Renato Tegon Forti, 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)
+
+// For more information, see http://www.boost.org
+
+// -------------------------------------------------------------------------------------
+// This example shows how to shared_variable_alias function to load a plugin of a DSO.
+// -------------------------------------------------------------------------------------
+
+#include "../shared_lib_path.hpp"
+
+//[callplugcpp_tutorial3
+
+#include <boost/plugin.hpp>
+#include <boost/make_shared.hpp>
+
+#include <iostream>
+
+#include "../tutorial_common/plugin_api.hpp"
+
+namespace pl = boost::plugin;
+
+std::size_t search_for_symbols(const std::vector<boost::filesystem::path>& plugins) {
+    std::size_t plugins_found = 0;
+    boost::shared_ptr<pl::shared_library> lib = boost::make_shared<pl::shared_library>();
+
+    for (std::size_t i = 0; i < plugins.size(); ++i) {
+        std::cout << "Loading plugin: " << plugins[i] << '\n';
+        lib->load(plugins[i]);
+        if (!lib->search_symbol("create_plugin")) {
+            // no such symbol
+            continue;
+        }
+
+        // library has symbol, importing...
+        typedef boost::shared_ptr<my_plugin_api> (pluginapi_create_t)();
+        boost::function<pluginapi_create_t> creator
+            = pl::shared_function_alias<pluginapi_create_t>(lib, "create_plugin");
+
+        std::cout << "Matching plugin name: " << creator()->name() << std::endl;
+        ++ plugins_found;
+    }
+
+    return plugins_found;
+}
+
+//]
+
+int main(int argc, char* argv[]) { 
+    // argv[1] contains path to our plugin library 
+    BOOST_ASSERT(argc >= 2);
+    std::vector<boost::filesystem::path> plugins;
+    plugins.push_back(shared_lib_path(argv[1], L"my_plugin_aggregator"));
+    plugins.push_back(shared_lib_path(argv[1], L"my_plugin_sum"));
+
+    const std::size_t res = search_for_symbols(plugins);
+    BOOST_ASSERT(res == 1);
+}