Method Create

examples/pluginmanager.cpp:78–84

            out << " - " << p.first << endl;
    }
    unique_ptr<Plugin> Create(const string& name, Menu* menu) const
    {
        for (auto& p: plugins)
            if (p.first == name)
                return p.second(menu);
        return {};
    }
private:
    static PluginRegistry instance;
    vector<pair<string, Factory>> plugins;