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/*
* Copyright (C) 2005-2018 Team Kodi
* This file is part of Kodi - https://kodi.tv
*
* SPDX-License-Identifier: GPL-2.0-or-later
* See LICENSES/README.md for more information.
*/
#pragma once
#include "AddonClass.h"
namespace XBMCAddon
{
/**
* <p>This is the parent class for the class templates that hold
* a callback. A callback is essentially a templatized
* functor (functoid?) for a call to a member function.</p>
*
* <p>This class combined with the attending CallbackHandlers should make
* sure that the AddonClass isn't in the midst of deallocating when
* the callback executes. In this way the Callback class acts as
* a weak reference.</p>
*/
class Callback : public AddonClass
{
protected:
AddonClass* addonClassObject;
explicit Callback(AddonClass* _object) : addonClassObject(_object) { XBMC_TRACE; }
public:
virtual void executeCallback() = 0;
~Callback() override;
AddonClass* getObject() { XBMC_TRACE; return addonClassObject; }
};
struct cb_null_type {};
// stub type template to be partial specialized
template<typename M = cb_null_type, typename T1 = cb_null_type,
typename T2 = cb_null_type, typename T3 = cb_null_type,
typename T4 = cb_null_type, typename Extraneous = cb_null_type>
class CallbackFunction {};
/**
* This is the template to carry a callback to a member function
* that returns 'void' (has no return) and takes no parameters.
*/
template<class M> class CallbackFunction<M, cb_null_type, cb_null_type, cb_null_type, cb_null_type, cb_null_type> : public Callback
{
public:
typedef void (M::*MemberFunction)();
protected:
MemberFunction meth;
M* obj;
public:
CallbackFunction(M* object, MemberFunction method) :
Callback(object), meth(method), obj(object) { XBMC_TRACE; }
~CallbackFunction() override { XBMC_TRACE; deallocating(); }
void executeCallback() override { XBMC_TRACE; ((*obj).*(meth))(); }
};
/**
* This is the template to carry a callback to a member function
* that returns 'void' (has no return) and takes one parameter.
*/
template<class M, typename P1> class CallbackFunction<M,P1, cb_null_type, cb_null_type, cb_null_type, cb_null_type> : public Callback
{
public:
typedef void (M::*MemberFunction)(P1);
protected:
MemberFunction meth;
M* obj;
P1 param;
public:
CallbackFunction(M* object, MemberFunction method, P1 parameter) :
Callback(object), meth(method), obj(object),
param(parameter) { XBMC_TRACE; }
~CallbackFunction() override { XBMC_TRACE; deallocating(); }
void executeCallback() override { XBMC_TRACE; ((*obj).*(meth))(param); }
};
/**
* This is the template to carry a callback to a member function
* that returns 'void' (has no return) and takes one parameter
* that can be held in an AddonClass::Ref
*/
template<class M, typename P1> class CallbackFunction<M,AddonClass::Ref<P1>, cb_null_type, cb_null_type, cb_null_type, cb_null_type> : public Callback
{
public:
typedef void (M::*MemberFunction)(P1*);
protected:
MemberFunction meth;
M* obj;
AddonClass::Ref<P1> param;
public:
CallbackFunction(M* object, MemberFunction method, P1* parameter) :
Callback(object), meth(method), obj(object),
param(parameter) { XBMC_TRACE; }
~CallbackFunction() override { XBMC_TRACE; deallocating(); }
void executeCallback() override { XBMC_TRACE; ((*obj).*(meth))(param); }
};
/**
* This is the template to carry a callback to a member function
* that returns 'void' (has no return) and takes two parameters.
*/
template<class M, typename P1, typename P2> class CallbackFunction<M,P1,P2, cb_null_type, cb_null_type, cb_null_type> : public Callback
{
public:
typedef void (M::*MemberFunction)(P1,P2);
protected:
MemberFunction meth;
M* obj;
P1 param1;
P2 param2;
public:
CallbackFunction(M* object, MemberFunction method, P1 parameter, P2 parameter2) :
Callback(object), meth(method), obj(object),
param1(parameter), param2(parameter2) { XBMC_TRACE; }
~CallbackFunction() override { XBMC_TRACE; deallocating(); }
void executeCallback() override { XBMC_TRACE; ((*obj).*(meth))(param1,param2); }
};
/**
* This is the template to carry a callback to a member function
* that returns 'void' (has no return) and takes three parameters.
*/
template<class M, typename P1, typename P2, typename P3> class CallbackFunction<M,P1,P2,P3, cb_null_type, cb_null_type> : public Callback
{
public:
typedef void (M::*MemberFunction)(P1,P2,P3);
protected:
MemberFunction meth;
M* obj;
P1 param1;
P2 param2;
P3 param3;
public:
CallbackFunction(M* object, MemberFunction method, P1 parameter, P2 parameter2, P3 parameter3) :
Callback(object), meth(method), obj(object),
param1(parameter), param2(parameter2), param3(parameter3) { XBMC_TRACE; }
~CallbackFunction() override { XBMC_TRACE; deallocating(); }
void executeCallback() override { XBMC_TRACE; ((*obj).*(meth))(param1,param2,param3); }
};
}
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