virtual_function_v0.h

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/*
**  ClanLib SDK
**  Copyright (c) 1997-2009 The ClanLib Team
**
**  This software is provided 'as-is', without any express or implied
**  warranty.  In no event will the authors be held liable for any damages
**  arising from the use of this software.
**
**  Permission is granted to anyone to use this software for any purpose,
**  including commercial applications, and to alter it and redistribute it
**  freely, subject to the following restrictions:
**
**  1. The origin of this software must not be misrepresented; you must not
**     claim that you wrote the original software. If you use this software
**     in a product, an acknowledgment in the product documentation would be
**     appreciated but is not required.
**  2. Altered source versions must be plainly marked as such, and must not be
**     misrepresented as being the original software.
**  3. This notice may not be removed or altered from any source distribution.
**
**  Note: Some of the libraries ClanLib may link to may have additional
**  requirements or restrictions.
**
**  File Author(s):
**
**    Magnus Norddahl
*/


#pragma once

#include "../api_core.h"
#include "../System/exception.h"
#include "slot.h"
#include "signals_impl.h"

class CL_Super_v0;

class CL_API_CORE CL_VirtualCallback_v0 : public CL_SlotCallback
{
public:
        virtual void invoke(CL_Super_v0 &super_func) = 0;
};

class CL_API_CORE CL_Super_v0
{
public:
        void invoke()
        {
                std::vector< CL_SharedPtr<CL_SlotCallback> >::reverse_iterator it = it_super;
                while (it != it_end)
                {
                        CL_Super_v0 parent;
                        parent.it_super = it;
                        parent.it_end = it_end;
                        ++parent.it_super;

                        if (it->get()->valid && it->get()->enabled)
                        {
                                ((CL_VirtualCallback_v0 *) it->get())->invoke(parent);
                                return;
                        }
                        ++it;
                }

                throw CL_Exception("Called non-invokable super function");
        }

        bool is_null() const
        {
                std::vector< CL_SharedPtr<CL_SlotCallback> >::reverse_iterator it = it_super;
                while (it != it_end)
                {
                        if (it->get()->valid && it->get()->enabled)
                                return true;
                        ++it;
                }
                return false;
        }

        bool is_invokable() const
        {
                return !is_null();
        }

        std::vector< CL_SharedPtr<CL_SlotCallback> >::reverse_iterator it_super;

        std::vector< CL_SharedPtr<CL_SlotCallback> >::reverse_iterator it_end;
};

class CL_API_CORE CL_VirtualCallback_v0_static : public CL_VirtualCallback_v0
{
public:
        CL_VirtualCallback_v0_static(void (*static_func)(CL_Super_v0 &))
        : static_func(static_func) { return; }
        void invoke(CL_Super_v0 &super_func) { static_func(super_func); }
        void (*static_func)(CL_Super_v0 &);
};

template <class UserData>
class CL_VirtualCallback_v0_static_user : public CL_VirtualCallback_v0
{
public:
        CL_VirtualCallback_v0_static_user(void (*static_func)(UserData, CL_Super_v0 &), const UserData &user_data)
        : static_func(static_func), user_data(user_data) { return; }
        void invoke(CL_Super_v0 &super_func) { static_func(user_data, super_func); }
        void (*static_func)(UserData, CL_Super_v0 &);
        UserData user_data;
};

template <class InstanceClass>
class CL_VirtualCallback_v0_member : public CL_VirtualCallback_v0
{
public:
        CL_VirtualCallback_v0_member(InstanceClass *instance, void (InstanceClass::*member_func)(CL_Super_v0 &))
        : instance(instance), member_func(member_func) { return; }
        void invoke(CL_Super_v0 &super_func) { (instance->*member_func)(super_func); }
        InstanceClass *instance;
        void (InstanceClass::*member_func)(CL_Super_v0 &);
};

template <class InstanceClass, class UserData>
class CL_VirtualCallback_v0_member_user : public CL_VirtualCallback_v0
{
public:
        CL_VirtualCallback_v0_member_user(InstanceClass *instance, void (InstanceClass::*member_func)(UserData, CL_Super_v0 &), const UserData &user_data)
        : instance(instance), member_func(member_func), user_data(user_data) { return; }
        void invoke(CL_Super_v0 &super_func) { (instance->*member_func)(user_data, super_func); }
        InstanceClass *instance;
        void (InstanceClass::*member_func)(UserData, CL_Super_v0 &);
        UserData user_data;
};

template <class Functor>
class CL_VirtualCallback_v0_functor : public CL_VirtualCallback_v0
{
public:
        CL_VirtualCallback_v0_functor(const Functor &functor)
        : functor(functor) { return; }
        void invoke(CL_Super_v0 &super_func) { functor(super_func); }
        Functor functor;
};

class CL_API_CORE CL_VirtualFunction_v0
{

public:
        CL_VirtualFunction_v0()
        : impl(new CL_Signal_Impl) { return; }

        CL_VirtualFunction_v0(const CL_VirtualFunction_v0 &copy)
        : impl(copy.impl) { return; }



public:
        CL_Slot connect(void (*function)(CL_Super_v0 &))
        {
                clean_up();
                CL_SharedPtr<CL_SlotCallback> callback(
                        new CL_VirtualCallback_v0_static(function));
                impl->connected_slots.push_back(callback);
                return CL_Slot(callback);
        }

        template<class UserData>
        CL_Slot connect(void (*function)(CL_Super_v0 &), const UserData &user_data)
        {
                clean_up();
                CL_SharedPtr<CL_SlotCallback> callback(
                        new CL_VirtualCallback_v0_static_user<UserData>(function, user_data));
                impl->connected_slots.push_back(callback);
                return CL_Slot(callback);
        }

        template<class InstanceClass>
        CL_Slot connect(InstanceClass *instance, void (InstanceClass::*function)(CL_Super_v0 &))
        {
                clean_up();
                CL_SharedPtr<CL_SlotCallback> callback(
                        new CL_VirtualCallback_v0_member<InstanceClass>(instance, function));
                impl->connected_slots.push_back(callback);
                return CL_Slot(callback);
        }

        template<class InstanceClass, class UserData>
        CL_Slot connect(InstanceClass *instance, void (InstanceClass::*function)(UserData, CL_Super_v0 &), const UserData &user_data)
        {
                clean_up();
                CL_SharedPtr<CL_SlotCallback> callback(
                        new CL_VirtualCallback_v0_member_user<InstanceClass, UserData>(instance, function, user_data));
                impl->connected_slots.push_back(callback);
                return CL_Slot(callback);
        }

        template<class Functor>
        CL_Slot connect_functor(const Functor &functor)
        {
                clean_up();
                CL_SharedPtr<CL_SlotCallback> callback(
                        new CL_VirtualCallback_v0_functor<Functor>(functor));
                impl->connected_slots.push_back(callback);
                return CL_Slot(callback);
        }

        void invoke() const
        {
                std::vector< CL_SharedPtr<CL_SlotCallback> > callbacks = impl->connected_slots;
                CL_Super_v0 s;
                s.it_super = callbacks.rbegin();
                s.it_end = callbacks.rend();
                s.invoke();
        }



private:
        void clean_up()
        {
                std::vector< CL_SharedPtr<CL_SlotCallback> >::size_type i, size;
                size = impl->connected_slots.size();
                for (i = 0; i < size; i++)
                {
                        if (!impl->connected_slots[i]->valid)
                        {
                                impl->connected_slots.erase(impl->connected_slots.begin()+i);
                                i--;
                                size--;
                        }
                }
        }

        CL_SharedPtr<CL_Signal_Impl> impl;
};

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