dynref.h

/*
 * InspIRCd -- Internet Relay Chat Daemon
 *
 *   Copyright (C) 2019-2020 Sadie Powell <[email protected]>
 *   Copyright (C) 2013-2015 Attila Molnar <[email protected]>
 *
 * This file is part of InspIRCd.  InspIRCd is free software: you can
 * redistribute it and/or modify it under the terms of the GNU General Public
 * License as published by the Free Software Foundation, version 2.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
 * details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
 
#pragma once
 
#include "base.h"
 
class CoreExport dynamic_reference_base : public interfacebase, public insp::intrusive_list_node<dynamic_reference_base>
{
 public:
        class CaptureHook
        {
         public:
                virtual void OnCapture() = 0;
        };
 
 private:
        std::string name;
        CaptureHook* hook;
        void resolve();
 protected:
        ServiceProvider* value;
 public:
        ModuleRef creator;
        dynamic_reference_base(Module* Creator, const std::string& Name);
        ~dynamic_reference_base();
        inline const std::string& GetProvider() const { return name; }
        void SetProvider(const std::string& newname);
 
        void SetCaptureHook(CaptureHook* h) { hook = h; }
 
        void check();
        operator bool() const { return (value != NULL); }
        static void reset_all();
};
 
inline void dynamic_reference_base::check()
{
        if (!value)
                throw ModuleException("Dynamic reference to '" + name + "' failed to resolve");
}
 
template<typename T>
class dynamic_reference : public dynamic_reference_base
{
 public:
        dynamic_reference(Module* Creator, const std::string& Name)
                : dynamic_reference_base(Creator, Name) {}
 
        inline T* operator->()
        {
                check();
                return static_cast<T*>(value);
        }
 
        T* operator*()
        {
                return operator->();
        }
 
        const T* operator->() const
        {
                return static_cast<T*>(value);
        }
 
        const T* operator*() const
        {
                return operator->();
        }
};
 
template<typename T>
class dynamic_reference_nocheck : public dynamic_reference_base
{
 public:
        dynamic_reference_nocheck(Module* Creator, const std::string& Name)
                : dynamic_reference_base(Creator, Name) {}
 
        T* operator->()
        {
                return static_cast<T*>(value);
        }
 
        T* operator*()
        {
                return operator->();
        }
 
        const T* operator->() const
        {
                return static_cast<T*>(value);
        }
 
        const T* operator*() const
        {
                return operator->();
        }
};
 
class ModeHandler;
class ChanModeReference : public dynamic_reference_nocheck<ModeHandler>
{
 public:
        ChanModeReference(Module* mod, const std::string& modename)
                : dynamic_reference_nocheck<ModeHandler>(mod, "mode/" + modename) {}
};
 
class UserModeReference : public dynamic_reference_nocheck<ModeHandler>
{
 public:
        UserModeReference(Module* mod, const std::string& modename)
                : dynamic_reference_nocheck<ModeHandler>(mod, "umode/" + modename) {}
};