Callbacks in C++

[Šimon Tóth]

Hi, i need to use callbacks in C++.

I found great article from Rich Hickey, and i'm using his callback.h
file in my project. The problem is that when I compile my project I get
two pages of warnings: 'implicit typename is deprecated'. Does anybody
have fixed version of callback.h, or does anybody know how to turn off
this warning?

Also any other methods for using class members as callback functions are
greatly apreciated.

Simon Toth

[Howard]

"Simon Tóth" <Si****@Mail.Muni.cz> wrote in message
news:IF********@news.muni.cz...

Hi, i need to use callbacks in C++.

I found great article from Rich Hickey, and i'm using his callback.h file
in my project. The problem is that when I compile my project I get two
pages of warnings: 'implicit typename is deprecated'. Does anybody have
fixed version of callback.h, or does anybody know how to turn off this
warning?

Also any other methods for using class members as callback functions are
greatly apreciated.

Simon Toth

Since most of us are not likely to have that particular file, you might want
to post at least a part of it that's causing the error. It's kind of hard
to guess exactly what construct causes that specific error message.

As for methods of callbacks, I've used two: one is to use a static member
function, and the other is to use a non-member function. In both cases, the
callback has a (void*) pointer which gets the value of the "this" pointer
when I set "register" the callback, and which I simply cast to the object
type I know it to be inside my callback, and use that to call a non-static
member function to do the actual work for me. (But I'm not familar with the
one you're discussing, at least not with that limited info.)

-Howard

[Alvin]

Å*imon Tóth wrote:

pseudoi need to use callbacks in C++.

I found great article from Rich Hickey, and i'm using his callback.h
file in my project. The problem is that when I compile my project I get
two pages of warnings: 'implicit typename is deprecated'. Does anybody
have fixed version of callback.h, or does anybody know how to turn off
this warning?

Also any other methods for using class members as callback functions are
greatly apreciated.

Simon Toth

I use the polymorphism approach. It sort of uses a class member as a
callback function, but not in the same fashion.

I create an abstract class (WorkerInterface below), which contains one or
more pure virtual methods. Then my other class (MyClass below) inherits
WorkerInterface and implements the pure virtual method.

For example (this wont compile..it just gets the point across)

// Interface
class WorkerInterface
{
public:
...
void worker_callback() = 0;
}

// Object that does stuff and calls the callback.
class Worker
{
public:
...
// adds l to the list to be called
void add_listener(WorkerInterface *l);

// removes l
void remove_listener(WorkerInterface *l);
private:
// calls the pure virtual function
fire_callback()
{
for(int i = 0; i < 5; i++)
if(listeners[i] != NULL)
listeners[i].worker_callback();
}

// Worker can have 5 registered listeners
WorkerInterface listeners[5];
}

class MyClass : public WorkerInterface
{
public:
MyClass(int i) : n(i) {worker.add_listener(this);}
void worker_callback()
{
cout << "MyClass " << n << " was called" << endl;
}

Worker worker;
int n;
}
--
Alvin

[©imon Tóth]

> Since most of us are not likely to have that particular file, you might want

to post at least a part of it that's causing the error. It's kind of hard
to guess exactly what construct causes that specific error message.

As I wrote, it's callback.h from Rich Hickey. I cant find the link now.

I just need to turn of the stupid "implicit typename is deprecated,
please see the documentation for details" warning.

[Howard]

"Simon Tóth" <Si****@Mail.Muni.cz> wrote in message
news:IF********@news.muni.cz...

Since most of us are not likely to have that particular file, you might
want to post at least a part of it that's causing the error. It's kind
of hard to guess exactly what construct causes that specific error
message. As I wrote, it's callback.h from Rich Hickey. I cant find the link now.

But you're getting an error, so I assume you have the code, right? How else
could you get an error compiling it?

I just need to turn of the stupid "implicit typename is deprecated, please
see the documentation for details" warning.

Turning off a warning is not always the best idea. If you have the .h file
(or code you've copied from it). posting the code that causes the warning is
your best bet for finding our *why* that warning is issued. But it's up to
you, obviously.

-Howard

[©imon Tóth]

//**************** callback.hpp **********************
// Copyright 1994 Rich Hickey
/* Permission to use, copy, modify, distribute and sell this software
* for any purpose is hereby granted without fee,
* provided that the above copyright notice appear in all copies and
* that both that copyright notice and this permission notice appear
* in supporting documentation. Rich Hickey makes no
* representations about the suitability of this software for any
* purpose. It is provided "as is" without express or implied warranty.
*/

// 08/31/96 Rich Hickey
// Added ==, != and <
// They are not inline, source is in file callback.cpp
// Note: You must compile and link in callback.obj if you use them
// C++ doesn't allow ptr-to-func to void * anymore -> changed to void
(*)(void)
// Added compiler workarounds for MS VC++ 4.2
// Prefixed all macros with RHCB
// Note: derivation from CBFunctorBase is now public, and access functions
// (for func, callee etc) are provided >>for implementation use only<<

// 06/12/94 Rich Hickey
// 3rd major revision
// Now functors are concrete classes, and should be held by value
// Virtual function mechanism removed
// Generic makeFunctor() mechanism added for building functors
// from both stand-alone functions and object/ptr-to-mem-func pairs

#ifndef CALLBACK_HPP
#define CALLBACK_HPP

/*
To use:

If you wish to build a component that provides/needs a callback, simply
specify and hold a CBFunctor of the type corresponding to the args
you wish to pass and the return value you need. There are 10 Functors
from which to choose:

CBFunctor0
CBFunctor1<P1>
CBFunctor2<P1,P2>
CBFunctor3<P1,P2,P3>
CBFunctor4<P1,P2,P3,P4>
CBFunctor0wRet<RT>
CBFunctor1wRet<P1,RT>
CBFunctor2wRet<P1,P2,RT>
CBFunctor3wRet<P1,P2,P3,RT>
CBFunctor4wRet<P1,P2,P3,P4,RT>

These are parameterized by their args and return value if any. Each has
a default ctor and an operator() with the corresponding signature.

They can be treated and used just like ptr-to-functions.

If you want to be a client of a component that uses callbacks, you
create a CBFunctor by calling makeFunctor().

There are three flavors of makeFunctor - you can create a functor from:

a ptr-to-stand-alone function
an object and a pointer-to-member function.
a pointer-to-member function (which will be called on first arg of functor)

Note: this last was not covered in the article - see CBEXAM3.CPP

The current iteration of this library requires you pass makeFunctor()
a dummy first argument of type ptr-to-the-Functor-type-you-want-to-create.
Simply cast 0 to provide this argument:

makeFunctor((target-functor*)0,ptr-to-function)
makeFunctor((target-functor*)0,reference-to-object,ptr-to-member-function)
makeFunctor((target-functor*)0,ptr-to-member-function)

Future versions will drop this requirement once member templates are
available.

The functor system is 100% type safe. It is also type flexible. You can
build a functor out of a function that is 'type compatible' with the
target functor - it need not have an exactly matching signature. By
type compatible I mean a function with the same number of arguments, of
types reachable from the functor's argument types by implicit conversion.
The return type of the function must be implicitly convertible to the
return type of the functor. A functor with no return can be built from a
function with a return - the return value is simply ignored.
(See ethel example below)

All the correct virtual function behavior is preserved. (see ricky
example below).

If you somehow try to create something in violation
of the type system you will get a compile-time or template-instantiation-
time error.

The CBFunctor base class and translator
classes are artifacts of this implementation. You should not write
code that relies upon their existence. Nor should you rely on the return
value of makeFunctor being anything in particular.

All that is guaranteed is that the Functor classes have a default ctor,
a ctor that can accept 0 as an initializer,
an operator() with the requested argument types and return type, an
operator that will allow it to be evaluated in a conditional (with
'true' meaning the functor is set, 'false' meaning it is not), and that
Functors can be constructed from the result of makeFunctor(), given
you've passed something compatible to makeFunctor(). In addition you
can compare 2 functors with ==, !=, and <. 2 functors with the same
'callee' (function, object and/or ptr-to-mem-func) shall compare
equal. op < forms an ordering relation across all callee types -> the
actual order is not meaningful or to be depended upon.

/////////////////////// BEGIN Example 1 //////////////////////////
#include <iostream.h>
#include "callback.hpp"

//do5Times() is a function that takes a functor and invokes it 5 times

void do5Times(const CBFunctor1<int> &doIt)
{
for(int i=0;i<5;i++)
doIt(i);
}

//Here are some standalone functions

void fred(int i){cout << "fred: " << i<<endl;}
int ethel(long l){cout << "ethel: " << l<<endl;return l;}

//Here is a class with a virtual function, and a derived class

class B{
public:
virtual void ricky(int i)
{cout << "B::ricky: " << i<<endl;}
};

class D:public B{
public:
void ricky(int i)
{cout << "D::ricky: " << i<<endl;}
};

void main()
{
//create a typedef of the functor type to simplify dummy argument
typedef CBFunctor1<int> *FtorType;

CBFunctor1<int> ftor; //a functor variable
//make a functor from ptr-to-function
ftor = makeFunctor((FtorType)0,fred);
do5Times(ftor);
//note ethel is not an exact match - ok, is compatible
ftor = makeFunctor((FtorType)0,ethel);
do5Times(ftor);

//create a D object to be a callback target
D myD;
//make functor from object and ptr-to-member-func
ftor = makeFunctor((FtorType)0,myD,&B::ricky);
do5Times(ftor);
}
/////////////////////// END of example 1 //////////////////////////

/////////////////////// BEGIN Example 2 //////////////////////////
#include <iostream.h>
#include "callback.hpp"

//Button is a component that provides a functor-based
//callback mechanism, so you can wire it up to whatever you wish

class Button{
public:
//ctor takes a functor and stores it away in a member

Button(const CBFunctor0 &uponClickDoThis):notify(uponClickDoThis)
{}
void click()
{
//invoke the functor, thus calling back client
notify();
}
private:
//note this is a data member with a verb for a name - matches its
//function-like usage
CBFunctor0 notify;
};

class CDPlayer{
public:
void play()
{cout << "Playing"<<endl;}
void stop()
{cout << "Stopped"<<endl;}
};

void main()
{
CDPlayer myCD;
Button playButton(makeFunctor((CBFunctor0*)0,myCD,&CDPlay er::play));
Button stopButton(makeFunctor((CBFunctor0*)0,myCD,&CDPlay er::stop));
playButton.click(); //calls myCD.play()
stopButton.click(); //calls myCD.stop()
}
/////////////////////// END of example 2 //////////////////////////

*/

//************************************************** ****************
///////////////////////////////////////////////////////////////////*
//WARNING - no need to read past this point, lest confusion ensue. *
//Only the curious need explore further - but remember *
//about that cat! *
///////////////////////////////////////////////////////////////////*
//************************************************** ****************

//////////////////////////////
// COMPILER BUG WORKAROUNDS:
// As of version 4.02 Borland has a code generation bug
// returning the result of a call via a ptr-to-function in a template

#ifdef __BORLANDC__
#define RHCB_BC4_RET_BUG(x) RT(x)
#else
#define RHCB_BC4_RET_BUG(x) x
#endif

// MS VC++ 4.2 still has many bugs relating to templates
// This version works around them as best I can - however note that
// MS will allow 'void (T::*)()const' to bind to a non-const member function
// of T. In addition, they do not support overloading template functions
// based on constness of ptr-to-mem-funcs.
// When _MSC_VER is defined I provide only the const versions,however it
is on
// the user's head, when calling makeFunctor with a const T, to make sure
// that the pointed-to member function is also const since MS won't
enforce it!

// Other than that the port is completely functional under VC++ 4.2

// One MS bug you may encounter during _use_ of the callbacks:
// If you pass them by reference you can't call op() on the reference
// Workaround is to pass by value.

/*
// MS unable to call operator() on template class reference
template <class T>
class Functor{
public:
void operator()(T t)const{};
};

void foo(const Functor<int> &f)
{
f(1); //error C2064: term does not evaluate to a function

//works when f is passed by value
}
*/

// Note: if you are porting to another compiler that is having trouble you
// can try defining some of these flags as well:
#if defined(_MSC_VER)
#define RHCB_CANT_PASS_MEMFUNC_BY_REFERENCE //like it says
#define RHCB_CANT_OVERLOAD_ON_CONSTNESS //of mem funcs
#define RHCB_CANT_INIT_REFERENCE_CTOR_STYLE //int i;int &ir(i); //MS
falls down
#define RHCB_WONT_PERFORM_PTR_CONVERSION //of 0 to ptr-to-any-type
#endif
// Don't touch this stuff
#if defined(RHCB_CANT_PASS_MEMFUNC_BY_REFERENCE)
#define RHCB_CONST_REF
#else
#define RHCB_CONST_REF const &
#endif

#if defined(RHCB_CANT_INIT_REFERENCE_CTOR_STYLE)
#define RHCB_CTOR_STYLE_INIT =
#else
#define RHCB_CTOR_STYLE_INIT
#endif

#if defined(RHCB_WONT_PERFORM_PTR_CONVERSION)
#define RHCB_DUMMY_INIT int
#else
#define RHCB_DUMMY_INIT DummyInit *
#endif

////////////////////////////// THE CODE //////////////////////////

//change these when your compiler gets bool
typedef int RHCB_BOOL;
enum {RHCB_FALSE ,RHCB_TRUE};

#include <string.h> //for memstuff
#include <stddef.h> //for size_t

//typeless representation of a function and optional object

class CBFunctorBase{
public:
//Note: ctors are protected

//for evaluation in conditionals - can the functor be called?
operator RHCB_BOOL()const{return callee||func;}

//Now you can put them in containers _and_ remove them!
//Source for these 3 is in callback.cpp
friend RHCB_BOOL
operator==(const CBFunctorBase &lhs,const CBFunctorBase &rhs);
friend RHCB_BOOL
operator!=(const CBFunctorBase &lhs,const CBFunctorBase &rhs);
friend RHCB_BOOL
operator<(const CBFunctorBase &lhs,const CBFunctorBase &rhs);

//The rest below for implementation use only !

class DummyInit{
};

typedef void (CBFunctorBase::*PMemFunc)();
typedef void (*PFunc)();
enum {MEM_FUNC_SIZE = sizeof(PMemFunc)};

PFunc getFunc() const {return func;}
void *getCallee() const {return callee;}
const char *getMemFunc() const {return memFunc;}

protected:
////////////////////////////////////////////////////////////////
// Note: this code depends on all ptr-to-mem-funcs being same size
// If that is not the case then make memFunc as large as largest
////////////////////////////////////////////////////////////////
union{
PFunc func;
char memFunc[MEM_FUNC_SIZE];
};
void *callee;

CBFunctorBase():callee(0),func(0){}
CBFunctorBase(const void *c,PFunc f, const void *mf,size_t sz):
callee((void *)c)
{
if(c) //must be callee/memfunc
{
memcpy(memFunc,mf,sz);
if(sz<MEM_FUNC_SIZE) //zero-out the rest, if any, so comparisons work
{
memset(memFunc+sz,0,MEM_FUNC_SIZE-sz);
}
}
else //must be ptr-to-func
{
func = f;
}
}
};
/************************* no arg - no return *******************/
class CBFunctor0:public CBFunctorBase{
public:
CBFunctor0(RHCB_DUMMY_INIT = 0){}
void operator()()const
{
thunk(*this);
}
protected:
typedef void (*Thunk)(const CBFunctorBase &);
CBFunctor0(Thunk t,const void *c,PFunc f,const void *mf,size_t sz):
CBFunctorBase(c,f,mf,sz),thunk(t){}
private:
Thunk thunk;
};

template <class Callee, class MemFunc>
class CBMemberTranslator0:public CBFunctor0{
public:
CBMemberTranslator0(Callee &c,const MemFunc &m):
CBFunctor0(thunk,&c,0,&m,sizeof(MemFunc)){}
static void thunk(const CBFunctorBase &ftor)
{
Callee *callee = (Callee *)ftor.getCallee();
MemFunc &memFunc RHCB_CTOR_STYLE_INIT
(*(MemFunc*)(void *)(ftor.getMemFunc()));
(callee->*memFunc)();
}
};

template <class Func>
class CBFunctionTranslator0:public CBFunctor0{
public:
CBFunctionTranslator0(Func f):CBFunctor0(thunk,0,(PFunc)f,0,0){}
static void thunk(const CBFunctorBase &ftor)
{
(Func(ftor.getFunc()))();
}
};

#if !defined(RHCB_CANT_OVERLOAD_ON_CONSTNESS)
template <class Callee,class TRT,class CallType>
inline CBMemberTranslator0<Callee,TRT (CallType::*)()>
makeFunctor(CBFunctor0 *,Callee &c,TRT (CallType::* RHCB_CONST_REF f)())
{
typedef TRT (CallType::*MemFunc)();
return CBMemberTranslator0<Callee,MemFunc>(c,f);
}
#endif

template <class Callee,class TRT,class CallType>
inline CBMemberTranslator0<const Callee,TRT (CallType::*)()const>
makeFunctor(CBFunctor0 *,const Callee &c,
TRT (CallType::* RHCB_CONST_REF f)()const)
{
typedef TRT (CallType::*MemFunc)()const;
return CBMemberTranslator0<const Callee,MemFunc>(c,f);
}

template <class TRT>
inline CBFunctionTranslator0<TRT (*)()>
makeFunctor(CBFunctor0 *,TRT (*f)())
{
return CBFunctionTranslator0<TRT (*)()>(f);
}

/************************* no arg - with return *******************/
template <class RT>
class CBFunctor0wRet:public CBFunctorBase{
public:
CBFunctor0wRet(RHCB_DUMMY_INIT = 0){}
RT operator()()const
{
return RHCB_BC4_RET_BUG(thunk(*this));
}
protected:
typedef RT (*Thunk)(const CBFunctorBase &);
CBFunctor0wRet(Thunk t,const void *c,PFunc f,const void *mf,size_t sz):
CBFunctorBase(c,f,mf,sz),thunk(t){}
private:
Thunk thunk;
};

template <class RT,class Callee, class MemFunc>
class CBMemberTranslator0wRet:public CBFunctor0wRet<RT>{
public:
CBMemberTranslator0wRet(Callee &c,const MemFunc &m):
CBFunctor0wRet<RT>(thunk,&c,0,&m,sizeof(MemFunc)){ }
static RT thunk(const CBFunctorBase &ftor)
{
Callee *callee = (Callee *)ftor.getCallee();
MemFunc &memFunc RHCB_CTOR_STYLE_INIT
(*(MemFunc*)(void *)(ftor.getMemFunc()));
return RHCB_BC4_RET_BUG((callee->*memFunc)());
}
};

template <class RT,class Func>
class CBFunctionTranslator0wRet:public CBFunctor0wRet<RT>{
public:
CBFunctionTranslator0wRet(Func
f):CBFunctor0wRet<RT>(thunk,0,(PFunc)f,0,0){}
static RT thunk(const CBFunctorBase &ftor)
{
return (Func(ftor.getFunc()))();
}
};

#if !defined(RHCB_CANT_OVERLOAD_ON_CONSTNESS)
template <class RT,class Callee,class TRT,class CallType>
inline CBMemberTranslator0wRet<RT,Callee,TRT (CallType::*)()>
makeFunctor(CBFunctor0wRet<RT>*,Callee &c,TRT (CallType::*
RHCB_CONST_REF f)())
{
typedef TRT (CallType::*MemFunc)();
return CBMemberTranslator0wRet<RT,Callee,MemFunc>(c,f);
}
#endif

template <class RT,class Callee,class TRT,class CallType>
inline CBMemberTranslator0wRet<RT,const Callee,TRT (CallType::*)()const>
makeFunctor(CBFunctor0wRet<RT>*,const Callee &c,
TRT (CallType::* RHCB_CONST_REF f)()const)
{
typedef TRT (CallType::*MemFunc)()const;
return CBMemberTranslator0wRet<RT,const Callee,MemFunc>(c,f);
}

template <class RT,class TRT>
inline CBFunctionTranslator0wRet<RT,TRT (*)()>
makeFunctor(CBFunctor0wRet<RT>*,TRT (*f)())
{
return CBFunctionTranslator0wRet<RT,TRT (*)()>(f);
}

/************************* one arg - no return *******************/
template <class P1>
class CBFunctor1:public CBFunctorBase{
public:
CBFunctor1(RHCB_DUMMY_INIT = 0){}
void operator()(P1 p1)const
{
thunk(*this,p1);
}
//for STL
typedef P1 argument_type;
typedef void result_type;
protected:
typedef void (*Thunk)(const CBFunctorBase &,P1);
CBFunctor1(Thunk t,const void *c,PFunc f,const void *mf,size_t sz):
CBFunctorBase(c,f,mf,sz),thunk(t){}
private:
Thunk thunk;
};

template <class P1,class Callee, class MemFunc>
class CBMemberTranslator1:public CBFunctor1<P1>{
public:
CBMemberTranslator1(Callee &c,const MemFunc &m):
CBFunctor1<P1>(thunk,&c,0,&m,sizeof(MemFunc)){}
static void thunk(const CBFunctorBase &ftor,P1 p1)
{
Callee *callee = (Callee *)ftor.getCallee();
MemFunc &memFunc RHCB_CTOR_STYLE_INIT
(*(MemFunc*)(void *)(ftor.getMemFunc()));
(callee->*memFunc)(p1);
}
};

template <class P1,class Func>
class CBFunctionTranslator1:public CBFunctor1<P1>{
public:
CBFunctionTranslator1(Func f):CBFunctor1<P1>(thunk,0,(PFunc)f,0,0){}
static void thunk(const CBFunctorBase &ftor,P1 p1)
{
(Func(ftor.getFunc()))(p1);
}
};

#if !defined(RHCB_CANT_OVERLOAD_ON_CONSTNESS)
template <class P1,class Callee,class TRT,class CallType,class TP1>
inline CBMemberTranslator1<P1,Callee,TRT (CallType::*)(TP1)>
makeFunctor(CBFunctor1<P1>*,Callee &c,TRT (CallType::* RHCB_CONST_REF
f)(TP1))
{
typedef TRT (CallType::*MemFunc)(TP1);
return CBMemberTranslator1<P1,Callee,MemFunc>(c,f);
}
#endif

template <class P1,class Callee,class TRT,class CallType,class TP1>
inline CBMemberTranslator1<P1,const Callee,TRT (CallType::*)(TP1)const>
makeFunctor(CBFunctor1<P1>*,const Callee &c,
TRT (CallType::* RHCB_CONST_REF f)(TP1)const)
{
typedef TRT (CallType::*MemFunc)(TP1)const;
return CBMemberTranslator1<P1,const Callee,MemFunc>(c,f);
}

template <class P1,class TRT,class TP1>
inline CBFunctionTranslator1<P1,TRT (*)(TP1)>
makeFunctor(CBFunctor1<P1>*,TRT (*f)(TP1))
{
return CBFunctionTranslator1<P1,TRT (*)(TP1)>(f);
}

template <class P1,class MemFunc>
class CBMemberOf1stArgTranslator1:public CBFunctor1<P1>{
public:
CBMemberOf1stArgTranslator1(const MemFunc &m):
CBFunctor1<P1>(thunk,(void *)1,0,&m,sizeof(MemFunc)){}
static void thunk(const CBFunctorBase &ftor,P1 p1)
{
MemFunc &memFunc RHCB_CTOR_STYLE_INIT
(*(MemFunc*)(void *)(ftor.getMemFunc()));
(p1.*memFunc)();
}
};

#if !defined(RHCB_CANT_OVERLOAD_ON_CONSTNESS)
template <class P1,class TRT,class CallType>
inline CBMemberOf1stArgTranslator1<P1,TRT (CallType::*)()>
makeFunctor(CBFunctor1<P1>*,TRT (CallType::* RHCB_CONST_REF f)())
{
typedef TRT (CallType::*MemFunc)();
return CBMemberOf1stArgTranslator1<P1,MemFunc>(f);
}
#endif

template <class P1,class TRT,class CallType>
inline CBMemberOf1stArgTranslator1<P1,TRT (CallType::*)()const>
makeFunctor(CBFunctor1<P1>*,TRT (CallType::* RHCB_CONST_REF f)()const)
{
typedef TRT (CallType::*MemFunc)()const;
return CBMemberOf1stArgTranslator1<P1,MemFunc>(f);
}

/************************* one arg - with return *******************/
template <class P1,class RT>
class CBFunctor1wRet:public CBFunctorBase{
public:
CBFunctor1wRet(RHCB_DUMMY_INIT = 0){}
RT operator()(P1 p1)const
{
return RHCB_BC4_RET_BUG(thunk(*this,p1));
}
//for STL
typedef P1 argument_type;
typedef RT result_type;
protected:
typedef RT (*Thunk)(const CBFunctorBase &,P1);
CBFunctor1wRet(Thunk t,const void *c,PFunc f,const void *mf,size_t sz):
CBFunctorBase(c,f,mf,sz),thunk(t){}
private:
Thunk thunk;
};

template <class P1,class RT,class Callee, class MemFunc>
class CBMemberTranslator1wRet:public CBFunctor1wRet<P1,RT>{
public:
CBMemberTranslator1wRet(Callee &c,const MemFunc &m):
CBFunctor1wRet<P1,RT>(thunk,&c,0,&m,sizeof(MemFunc )){}
static RT thunk(const CBFunctorBase &ftor,P1 p1)
{
Callee *callee = (Callee *)ftor.getCallee();
MemFunc &memFunc RHCB_CTOR_STYLE_INIT
(*(MemFunc*)(void *)(ftor.getMemFunc()));
return RHCB_BC4_RET_BUG((callee->*memFunc)(p1));
}
};

template <class P1,class RT,class Func>
class CBFunctionTranslator1wRet:public CBFunctor1wRet<P1,RT>{
public:
CBFunctionTranslator1wRet(Func f):
CBFunctor1wRet<P1,RT>(thunk,0,(PFunc)f,0,0){}
static RT thunk(const CBFunctorBase &ftor,P1 p1)
{
return (Func(ftor.getFunc()))(p1);
}
};

#if !defined(RHCB_CANT_OVERLOAD_ON_CONSTNESS)
template <class P1,class RT,
class Callee,class TRT,class CallType,class TP1>
inline CBMemberTranslator1wRet<P1,RT,Callee,TRT (CallType::*)(TP1)>
makeFunctor(CBFunctor1wRet<P1,RT>*,Callee &c,
TRT (CallType::* RHCB_CONST_REF f)(TP1))
{
typedef TRT (CallType::*MemFunc)(TP1);
return CBMemberTranslator1wRet<P1,RT,Callee,MemFunc>(c,f) ;
}
#endif

template <class P1,class RT,
class Callee,class TRT,class CallType,class TP1>
inline CBMemberTranslator1wRet<P1,RT,
const Callee,TRT (CallType::*)(TP1)const>
makeFunctor(CBFunctor1wRet<P1,RT>*,
const Callee &c,TRT (CallType::* RHCB_CONST_REF f)(TP1)const)
{
typedef TRT (CallType::*MemFunc)(TP1)const;
return CBMemberTranslator1wRet<P1,RT,const Callee,MemFunc>(c,f);
}

template <class P1,class RT,class TRT,class TP1>
inline CBFunctionTranslator1wRet<P1,RT,TRT (*)(TP1)>
makeFunctor(CBFunctor1wRet<P1,RT>*,TRT (*f)(TP1))
{
return CBFunctionTranslator1wRet<P1,RT,TRT (*)(TP1)>(f);
}

template <class P1,class RT,class MemFunc>
class CBMemberOf1stArgTranslator1wRet:public CBFunctor1wRet<P1,RT>{
public:
CBMemberOf1stArgTranslator1wRet(const MemFunc &m):
CBFunctor1wRet<P1,RT>(thunk,(void *)1,0,&m,sizeof(MemFunc)){}
static RT thunk(const CBFunctorBase &ftor,P1 p1)
{
MemFunc &memFunc RHCB_CTOR_STYLE_INIT
(*(MemFunc*)(void *)(ftor.getMemFunc()));
return RHCB_BC4_RET_BUG((p1.*memFunc)());
}
};

#if !defined(RHCB_CANT_OVERLOAD_ON_CONSTNESS)
template <class P1,class RT,class TRT,class CallType>
inline CBMemberOf1stArgTranslator1wRet<P1,RT,TRT (CallType::*)()>
makeFunctor(CBFunctor1wRet<P1,RT>*,TRT (CallType::* RHCB_CONST_REF f)())
{
typedef TRT (CallType::*MemFunc)();
return CBMemberOf1stArgTranslator1wRet<P1,RT,MemFunc>(f);
}
#endif

template <class P1,class RT,class TRT,class CallType>
inline CBMemberOf1stArgTranslator1wRet<P1,RT,TRT (CallType::*)()const>
makeFunctor(CBFunctor1wRet<P1,RT>*,TRT (CallType::* RHCB_CONST_REF
f)()const)
{
typedef TRT (CallType::*MemFunc)()const;
return CBMemberOf1stArgTranslator1wRet<P1,RT,MemFunc>(f);
}
/************************* two args - no return *******************/
template <class P1,class P2>
class CBFunctor2:public CBFunctorBase{
public:
CBFunctor2(RHCB_DUMMY_INIT = 0){}
void operator()(P1 p1,P2 p2)const
{
thunk(*this,p1,p2);
}
//for STL
typedef P1 first_argument_type;
typedef P2 second_argument_type;
typedef void result_type;
protected:
typedef void (*Thunk)(const CBFunctorBase &,P1,P2);
CBFunctor2(Thunk t,const void *c,PFunc f,const void *mf,size_t sz):
CBFunctorBase(c,f,mf,sz),thunk(t){}
private:
Thunk thunk;
};

template <class P1,class P2,class Callee, class MemFunc>
class CBMemberTranslator2:public CBFunctor2<P1,P2>{
public:
CBMemberTranslator2(Callee &c,const MemFunc &m):
CBFunctor2<P1,P2>(thunk,&c,0,&m,sizeof(MemFunc)){}
static void thunk(const CBFunctorBase &ftor,P1 p1,P2 p2)
{
Callee *callee = (Callee *)ftor.getCallee();
MemFunc &memFunc RHCB_CTOR_STYLE_INIT
(*(MemFunc*)(void *)(ftor.getMemFunc()));
(callee->*memFunc)(p1,p2);
}
};

template <class P1,class P2,class Func>
class CBFunctionTranslator2:public CBFunctor2<P1,P2>{
public:
CBFunctionTranslator2(Func f):CBFunctor2<P1,P2>(thunk,0,(PFunc)f,0,0){}
static void thunk(const CBFunctorBase &ftor,P1 p1,P2 p2)
{
(Func(ftor.getFunc()))(p1,p2);
}
};

#if !defined(RHCB_CANT_OVERLOAD_ON_CONSTNESS)
template <class P1,class P2,class Callee,
class TRT,class CallType,class TP1,class TP2>
inline CBMemberTranslator2<P1,P2,Callee,TRT (CallType::*)(TP1,TP2)>
makeFunctor(CBFunctor2<P1,P2>*,Callee &c,
TRT (CallType::* RHCB_CONST_REF f)(TP1,TP2))
{
typedef TRT (CallType::*MemFunc)(TP1,TP2);
return CBMemberTranslator2<P1,P2,Callee,MemFunc>(c,f);
}
#endif

template <class P1,class P2,class Callee,
class TRT,class CallType,class TP1,class TP2>
inline CBMemberTranslator2<P1,P2,const Callee,
TRT (CallType::*)(TP1,TP2)const>
makeFunctor(CBFunctor2<P1,P2>*,const Callee &c,
TRT (CallType::* RHCB_CONST_REF f)(TP1,TP2)const)
{
typedef TRT (CallType::*MemFunc)(TP1,TP2)const;
return CBMemberTranslator2<P1,P2,const Callee,MemFunc>(c,f);
}

template <class P1,class P2,class TRT,class TP1,class TP2>
inline CBFunctionTranslator2<P1,P2,TRT (*)(TP1,TP2)>
makeFunctor(CBFunctor2<P1,P2>*,TRT (*f)(TP1,TP2))
{
return CBFunctionTranslator2<P1,P2,TRT (*)(TP1,TP2)>(f);
}

template <class P1,class P2,class MemFunc>
class CBMemberOf1stArgTranslator2:public CBFunctor2<P1,P2>{
public:
CBMemberOf1stArgTranslator2(const MemFunc &m):
CBFunctor2<P1,P2>(thunk,(void *)1,0,&m,sizeof(MemFunc)){}
static void thunk(const CBFunctorBase &ftor,P1 p1,P2 p2)
{
MemFunc &memFunc RHCB_CTOR_STYLE_INIT
(*(MemFunc*)(void *)(ftor.getMemFunc()));
(p1.*memFunc)(p2);
}
};

#if !defined(RHCB_CANT_OVERLOAD_ON_CONSTNESS)
template <class P1,class P2,class TRT,class CallType,class TP1>
inline CBMemberOf1stArgTranslator2<P1,P2,TRT (CallType::*)(TP1)>
makeFunctor(CBFunctor2<P1,P2>*,TRT (CallType::* RHCB_CONST_REF f)(TP1))
{
typedef TRT (CallType::*MemFunc)(TP1);
return CBMemberOf1stArgTranslator2<P1,P2,MemFunc>(f);
}
#endif

template <class P1,class P2,class TRT,class CallType,class TP1>
inline CBMemberOf1stArgTranslator2<P1,P2,TRT (CallType::*)(TP1)const>
makeFunctor(CBFunctor2<P1,P2>*,TRT (CallType::* RHCB_CONST_REF f)(TP1)const)
{
typedef TRT (CallType::*MemFunc)(TP1)const;
return CBMemberOf1stArgTranslator2<P1,P2,MemFunc>(f);
}
/************************* two args - with return *******************/
template <class P1,class P2,class RT>
class CBFunctor2wRet:public CBFunctorBase{
public:
CBFunctor2wRet(RHCB_DUMMY_INIT = 0){}
RT operator()(P1 p1,P2 p2)const
{
return RHCB_BC4_RET_BUG(thunk(*this,p1,p2));
}
//for STL
typedef P1 first_argument_type;
typedef P2 second_argument_type;
typedef RT result_type;
protected:
typedef RT (*Thunk)(const CBFunctorBase &,P1,P2);
CBFunctor2wRet(Thunk t,const void *c,PFunc f,const void *mf,size_t sz):
CBFunctorBase(c,f,mf,sz),thunk(t){}
private:
Thunk thunk;
};

template <class P1,class P2,class RT,class Callee, class MemFunc>
class CBMemberTranslator2wRet:public CBFunctor2wRet<P1,P2,RT>{
public:
CBMemberTranslator2wRet(Callee &c,const MemFunc &m):
CBFunctor2wRet<P1,P2,RT>(thunk,&c,0,&m,sizeof(MemF unc)){}
static RT thunk(const CBFunctorBase &ftor,P1 p1,P2 p2)
{
Callee *callee = (Callee *)ftor.getCallee();
MemFunc &memFunc RHCB_CTOR_STYLE_INIT
(*(MemFunc*)(void *)(ftor.getMemFunc()));
return RHCB_BC4_RET_BUG((callee->*memFunc)(p1,p2));
}
};

template <class P1,class P2,class RT,class Func>
class CBFunctionTranslator2wRet:public CBFunctor2wRet<P1,P2,RT>{
public:
CBFunctionTranslator2wRet(Func f):
CBFunctor2wRet<P1,P2,RT>(thunk,0,(PFunc)f,0,0){}
static RT thunk(const CBFunctorBase &ftor,P1 p1,P2 p2)
{
return (Func(ftor.getFunc()))(p1,p2);
}
};

#if !defined(RHCB_CANT_OVERLOAD_ON_CONSTNESS)
template <class P1,class P2,class RT,class Callee,
class TRT,class CallType,class TP1,class TP2>
inline CBMemberTranslator2wRet<P1,P2,RT,Callee,
TRT (CallType::*)(TP1,TP2)>
makeFunctor(CBFunctor2wRet<P1,P2,RT>*,Callee &c,
TRT (CallType::* RHCB_CONST_REF f)(TP1,TP2))
{
typedef TRT (CallType::*MemFunc)(TP1,TP2);
return CBMemberTranslator2wRet<P1,P2,RT,Callee,MemFunc>(c ,f);
}
#endif

template <class P1,class P2,class RT,class Callee,
class TRT,class CallType,class TP1,class TP2>
inline CBMemberTranslator2wRet<P1,P2,RT,const Callee,
TRT (CallType::*)(TP1,TP2)const>
makeFunctor(CBFunctor2wRet<P1,P2,RT>*,const Callee &c,
TRT (CallType::* RHCB_CONST_REF f)(TP1,TP2)const)
{
typedef TRT (CallType::*MemFunc)(TP1,TP2)const;
return CBMemberTranslator2wRet<P1,P2,RT,const Callee,MemFunc>(c,f);
}

template <class P1,class P2,class RT,class TRT,class TP1,class TP2>
inline CBFunctionTranslator2wRet<P1,P2,RT,TRT (*)(TP1,TP2)>
makeFunctor(CBFunctor2wRet<P1,P2,RT>*,TRT (*f)(TP1,TP2))
{
return CBFunctionTranslator2wRet<P1,P2,RT,TRT (*)(TP1,TP2)>(f);
}

template <class P1,class P2,class RT,class MemFunc>
class CBMemberOf1stArgTranslator2wRet:public CBFunctor2wRet<P1,P2,RT>{
public:
CBMemberOf1stArgTranslator2wRet(const MemFunc &m):
CBFunctor2wRet<P1,P2,RT>(thunk,(void *)1,0,&m,sizeof(MemFunc)){}
static RT thunk(const CBFunctorBase &ftor,P1 p1,P2 p2)
{
MemFunc &memFunc RHCB_CTOR_STYLE_INIT
(*(MemFunc*)(void *)(ftor.getMemFunc()));
return RHCB_BC4_RET_BUG((p1.*memFunc)(p2));
}
};

#if !defined(RHCB_CANT_OVERLOAD_ON_CONSTNESS)
template <class P1,class P2,class RT,class TRT,class CallType,class TP1>
inline CBMemberOf1stArgTranslator2wRet<P1,P2,RT,TRT (CallType::*)(TP1)>
makeFunctor(CBFunctor2wRet<P1,P2,RT>*,TRT (CallType::* RHCB_CONST_REF
f)(TP1))
{
typedef TRT (CallType::*MemFunc)(TP1);
return CBMemberOf1stArgTranslator2wRet<P1,P2,RT,MemFunc>( f);
}
#endif

template <class P1,class P2,class RT,class TRT,class CallType,class TP1>
inline CBMemberOf1stArgTranslator2wRet<P1,P2,RT,TRT (CallType::*)(TP1)const>
makeFunctor(CBFunctor2wRet<P1,P2,RT>*,
TRT (CallType::* RHCB_CONST_REF f)(TP1)const)
{
typedef TRT (CallType::*MemFunc)(TP1)const;
return CBMemberOf1stArgTranslator2wRet<P1,P2,RT,MemFunc>( f);
}
/************************* three args - no return *******************/
template <class P1,class P2,class P3>
class CBFunctor3:public CBFunctorBase{
public:
CBFunctor3(RHCB_DUMMY_INIT = 0){}
void operator()(P1 p1,P2 p2,P3 p3)const
{
thunk(*this,p1,p2,p3);
}
protected:
typedef void (*Thunk)(const CBFunctorBase &,P1,P2,P3);
CBFunctor3(Thunk t,const void *c,PFunc f,const void *mf,size_t sz):
CBFunctorBase(c,f,mf,sz),thunk(t){}
private:
Thunk thunk;
};

template <class P1,class P2,class P3,class Callee, class MemFunc>
class CBMemberTranslator3:public CBFunctor3<P1,P2,P3>{
public:
CBMemberTranslator3(Callee &c,const MemFunc &m):
CBFunctor3<P1,P2,P3>(thunk,&c,0,&m,sizeof(MemFunc) ){}
static void thunk(const CBFunctorBase &ftor,P1 p1,P2 p2,P3 p3)
{
Callee *callee = (Callee *)ftor.getCallee();
MemFunc &memFunc RHCB_CTOR_STYLE_INIT
(*(MemFunc*)(void *)(ftor.getMemFunc()));
(callee->*memFunc)(p1,p2,p3);
}
};

template <class P1,class P2,class P3,class Func>
class CBFunctionTranslator3:public CBFunctor3<P1,P2,P3>{
public:
CBFunctionTranslator3(Func f):CBFunctor3<P1,P2,P3>(thunk,0,(PFunc)f,0,0){}
static void thunk(const CBFunctorBase &ftor,P1 p1,P2 p2,P3 p3)
{
(Func(ftor.getFunc()))(p1,p2,p3);
}
};

#if !defined(RHCB_CANT_OVERLOAD_ON_CONSTNESS)
template <class P1,class P2,class P3,class Callee,
class TRT,class CallType,class TP1,class TP2,class TP3>
inline CBMemberTranslator3<P1,P2,P3,Callee,
TRT (CallType::*)(TP1,TP2,TP3)>
makeFunctor(CBFunctor3<P1,P2,P3>*,Callee &c,
TRT (CallType::* RHCB_CONST_REF f)(TP1,TP2,TP3))
{
typedef TRT (CallType::*MemFunc)(TP1,TP2,TP3);
return CBMemberTranslator3<P1,P2,P3,Callee,MemFunc>(c,f);
}
#endif

template <class P1,class P2,class P3,class Callee,
class TRT,class CallType,class TP1,class TP2,class TP3>
inline CBMemberTranslator3<P1,P2,P3,const Callee,
TRT (CallType::*)(TP1,TP2,TP3)const>
makeFunctor(CBFunctor3<P1,P2,P3>*,const Callee &c,
TRT (CallType::* RHCB_CONST_REF f)(TP1,TP2,TP3)const)
{
typedef TRT (CallType::*MemFunc)(TP1,TP2,TP3)const;
return CBMemberTranslator3<P1,P2,P3,const Callee,MemFunc>(c,f);
}

template <class P1,class P2,class P3,
class TRT,class TP1,class TP2,class TP3>
inline CBFunctionTranslator3<P1,P2,P3,TRT (*)(TP1,TP2,TP3)>
makeFunctor(CBFunctor3<P1,P2,P3>*,TRT (*f)(TP1,TP2,TP3))
{
return CBFunctionTranslator3<P1,P2,P3,TRT (*)(TP1,TP2,TP3)>(f);
}

template <class P1,class P2,class P3,class MemFunc>
class CBMemberOf1stArgTranslator3:public CBFunctor3<P1,P2,P3>{
public:
CBMemberOf1stArgTranslator3(const MemFunc &m):
CBFunctor3<P1,P2,P3>(thunk,(void *)1,0,&m,sizeof(MemFunc)){}
static void thunk(const CBFunctorBase &ftor,P1 p1,P2 p2,P3 p3)
{
MemFunc &memFunc RHCB_CTOR_STYLE_INIT
(*(MemFunc*)(void *)(ftor.getMemFunc()));
(p1.*memFunc)(p2,p3);
}
};

#if !defined(RHCB_CANT_OVERLOAD_ON_CONSTNESS)
template <class P1,class P2,class P3,class TRT,class CallType,
class TP1,class TP2>
inline CBMemberOf1stArgTranslator3<P1,P2,P3,TRT (CallType::*)(TP1,TP2)>
makeFunctor(CBFunctor3<P1,P2,P3>*,TRT (CallType::* RHCB_CONST_REF
f)(TP1,TP2))
{
typedef TRT (CallType::*MemFunc)(TP1,TP2);
return CBMemberOf1stArgTranslator3<P1,P2,P3,MemFunc>(f);
}
#endif

template <class P1,class P2,class P3,class TRT,class CallType,
class TP1,class TP2>
inline CBMemberOf1stArgTranslator3<P1,P2,P3,TRT (CallType::*)(TP1,TP2)const>
makeFunctor(CBFunctor3<P1,P2,P3>*,
TRT (CallType::* RHCB_CONST_REF f)(TP1,TP2)const)
{
typedef TRT (CallType::*MemFunc)(TP1,TP2)const;
return CBMemberOf1stArgTranslator3<P1,P2,P3,MemFunc>(f);
}
/************************* three args - with return *******************/
template <class P1,class P2,class P3,class RT>
class CBFunctor3wRet:public CBFunctorBase{
public:
CBFunctor3wRet(RHCB_DUMMY_INIT = 0){}
RT operator()(P1 p1,P2 p2,P3 p3)const
{
return RHCB_BC4_RET_BUG(thunk(*this,p1,p2,p3));
}
protected:
typedef RT (*Thunk)(const CBFunctorBase &,P1,P2,P3);
CBFunctor3wRet(Thunk t,const void *c,PFunc f,const void *mf,size_t sz):
CBFunctorBase(c,f,mf,sz),thunk(t){}
private:
Thunk thunk;
};

template <class P1,class P2,class P3,
class RT,class Callee, class MemFunc>
class CBMemberTranslator3wRet:public CBFunctor3wRet<P1,P2,P3,RT>{
public:
CBMemberTranslator3wRet(Callee &c,const MemFunc &m):
CBFunctor3wRet<P1,P2,P3,RT>(thunk,&c,0,&m,sizeof(M emFunc)){}
static RT thunk(const CBFunctorBase &ftor,P1 p1,P2 p2,P3 p3)
{
Callee *callee = (Callee *)ftor.getCallee();
MemFunc &memFunc RHCB_CTOR_STYLE_INIT
(*(MemFunc*)(void *)(ftor.getMemFunc()));
return RHCB_BC4_RET_BUG((callee->*memFunc)(p1,p2,p3));
}
};

template <class P1,class P2,class P3,class RT,class Func>
class CBFunctionTranslator3wRet:public CBFunctor3wRet<P1,P2,P3,RT>{
public:
CBFunctionTranslator3wRet(Func f):
CBFunctor3wRet<P1,P2,P3,RT>(thunk,0,(PFunc)f,0,0){ }
static RT thunk(const CBFunctorBase &ftor,P1 p1,P2 p2,P3 p3)
{
return (Func(ftor.getFunc()))(p1,p2,p3);
}
};

#if !defined(RHCB_CANT_OVERLOAD_ON_CONSTNESS)
template <class P1,class P2,class P3,class RT,class Callee,
class TRT,class CallType,class TP1,class TP2,class TP3>
inline CBMemberTranslator3wRet<P1,P2,P3,RT,Callee,
TRT (CallType::*)(TP1,TP2,TP3)>
makeFunctor(CBFunctor3wRet<P1,P2,P3,RT>*,Callee &c,
TRT (CallType::* RHCB_CONST_REF f)(TP1,TP2,TP3))
{
typedef TRT (CallType::*MemFunc)(TP1,TP2,TP3);
return CBMemberTranslator3wRet<P1,P2,P3,RT,Callee,MemFunc >(c,f);
}
#endif

template <class P1,class P2,class P3,class RT,class Callee,
class TRT,class CallType,class TP1,class TP2,class TP3>
inline CBMemberTranslator3wRet<P1,P2,P3,RT,const Callee,
TRT (CallType::*)(TP1,TP2,TP3)const>
makeFunctor(CBFunctor3wRet<P1,P2,P3,RT>*,const Callee &c,
TRT (CallType::* RHCB_CONST_REF f)(TP1,TP2,TP3)const)
{
typedef TRT (CallType::*MemFunc)(TP1,TP2,TP3)const;
return CBMemberTranslator3wRet<P1,P2,P3,RT,const Callee,MemFunc>(c,f);
}

template <class P1,class P2,class P3,class RT,
class TRT,class TP1,class TP2,class TP3>
inline CBFunctionTranslator3wRet<P1,P2,P3,RT,TRT (*)(TP1,TP2,TP3)>
makeFunctor(CBFunctor3wRet<P1,P2,P3,RT>*,TRT (*f)(TP1,TP2,TP3))
{
return CBFunctionTranslator3wRet<P1,P2,P3,RT,TRT (*)(TP1,TP2,TP3)>(f);
}

template <class P1,class P2,class P3,class RT,class MemFunc>
class CBMemberOf1stArgTranslator3wRet:public CBFunctor3wRet<P1,P2,P3,RT>{
public:
CBMemberOf1stArgTranslator3wRet(const MemFunc &m):
CBFunctor3wRet<P1,P2,P3,RT>(thunk,(void *)1,0,&m,sizeof(MemFunc)){}
static RT thunk(const CBFunctorBase &ftor,P1 p1,P2 p2,P3 p3)
{
MemFunc &memFunc RHCB_CTOR_STYLE_INIT
(*(MemFunc*)(void *)(ftor.getMemFunc()));
return RHCB_BC4_RET_BUG((p1.*memFunc)(p2,p3));
}
};

#if !defined(RHCB_CANT_OVERLOAD_ON_CONSTNESS)
template <class P1,class P2,class P3,class RT,class TRT,class CallType,
class TP1,class TP2>
inline CBMemberOf1stArgTranslator3wRet<P1,P2,P3,RT,TRT
(CallType::*)(TP1,TP2)>
makeFunctor(CBFunctor3wRet<P1,P2,P3,RT>*,
TRT (CallType::* RHCB_CONST_REF f)(TP1,TP2))
{
typedef TRT (CallType::*MemFunc)(TP1,TP2);
return CBMemberOf1stArgTranslator3wRet<P1,P2,P3,RT,MemFun c>(f);
}
#endif

template <class P1,class P2,class P3,class RT,class TRT,class CallType,
class TP1,class TP2>
inline CBMemberOf1stArgTranslator3wRet<P1,P2,P3,RT,
TRT (CallType::*)(TP1,TP2)const>
makeFunctor(CBFunctor3wRet<P1,P2,P3,RT>*,
TRT (CallType::* RHCB_CONST_REF f)(TP1,TP2)const)
{
typedef TRT (CallType::*MemFunc)(TP1,TP2)const;
return CBMemberOf1stArgTranslator3wRet<P1,P2,P3,RT,MemFun c>(f);
}
/************************* four args - no return *******************/
template <class P1,class P2,class P3,class P4>
class CBFunctor4:public CBFunctorBase{
public:
CBFunctor4(RHCB_DUMMY_INIT = 0){}
void operator()(P1 p1,P2 p2,P3 p3,P4 p4)const
{
thunk(*this,p1,p2,p3,p4);
}
protected:
typedef void (*Thunk)(const CBFunctorBase &,P1,P2,P3,P4);
CBFunctor4(Thunk t,const void *c,PFunc f,const void *mf,size_t sz):
CBFunctorBase(c,f,mf,sz),thunk(t){}
private:
Thunk thunk;
};

template <class P1,class P2,class P3,class P4,
class Callee, class MemFunc>
class CBMemberTranslator4:public CBFunctor4<P1,P2,P3,P4>{
public:
CBMemberTranslator4(Callee &c,const MemFunc &m):
CBFunctor4<P1,P2,P3,P4>(thunk,&c,0,&m,sizeof(MemFu nc)){}
static void thunk(const CBFunctorBase &ftor,P1 p1,P2 p2,P3 p3,P4 p4)
{
Callee *callee = (Callee *)ftor.getCallee();
MemFunc &memFunc RHCB_CTOR_STYLE_INIT
(*(MemFunc*)(void *)(ftor.getMemFunc()));
(callee->*memFunc)(p1,p2,p3,p4);
}
};

template <class P1,class P2,class P3,class P4,class Func>
class CBFunctionTranslator4:public CBFunctor4<P1,P2,P3,P4>{
public:
CBFunctionTranslator4(Func f):
CBFunctor4<P1,P2,P3,P4>(thunk,0,(PFunc)f,0,0){}
static void thunk(const CBFunctorBase &ftor,P1 p1,P2 p2,P3 p3,P4 p4)
{
(Func(ftor.getFunc()))(p1,p2,p3,p4);
}
};

#if !defined(RHCB_CANT_OVERLOAD_ON_CONSTNESS)
template <class P1,class P2,class P3,class P4,class Callee,
class TRT,class CallType,class TP1,class TP2,class TP3,class TP4>
inline CBMemberTranslator4<P1,P2,P3,P4,Callee,
TRT (CallType::*)(TP1,TP2,TP3,TP4)>
makeFunctor(CBFunctor4<P1,P2,P3,P4>*,Callee &c,
TRT (CallType::* RHCB_CONST_REF f)(TP1,TP2,TP3,TP4))
{
typedef TRT (CallType::*MemFunc)(TP1,TP2,TP3,TP4);
return CBMemberTranslator4<P1,P2,P3,P4,Callee,MemFunc>(c, f);
}
#endif

template <class P1,class P2,class P3,class P4,class Callee,
class TRT,class CallType,class TP1,class TP2,class TP3,class TP4>
inline CBMemberTranslator4<P1,P2,P3,P4,const Callee,
TRT (CallType::*)(TP1,TP2,TP3,TP4)const>
makeFunctor(CBFunctor4<P1,P2,P3,P4>*,const Callee &c,
TRT (CallType::* RHCB_CONST_REF f)(TP1,TP2,TP3,TP4)const)
{
typedef TRT (CallType::*MemFunc)(TP1,TP2,TP3,TP4)const;
return CBMemberTranslator4<P1,P2,P3,P4,const Callee,MemFunc>(c,f);
}

template <class P1,class P2,class P3,class P4,
class TRT,class TP1,class TP2,class TP3,class TP4>
inline CBFunctionTranslator4<P1,P2,P3,P4,TRT (*)(TP1,TP2,TP3,TP4)>
makeFunctor(CBFunctor4<P1,P2,P3,P4>*,TRT (*f)(TP1,TP2,TP3,TP4))
{
return CBFunctionTranslator4<P1,P2,P3,P4,TRT (*)(TP1,TP2,TP3,TP4)>(f);
}

template <class P1,class P2,class P3,class P4,class MemFunc>
class CBMemberOf1stArgTranslator4:public CBFunctor4<P1,P2,P3,P4>{
public:
CBMemberOf1stArgTranslator4(const MemFunc &m):
CBFunctor4<P1,P2,P3,P4>(thunk,(void *)1,0,&m,sizeof(MemFunc)){}
static void thunk(const CBFunctorBase &ftor,P1 p1,P2 p2,P3 p3,P4 p4)
{
MemFunc &memFunc RHCB_CTOR_STYLE_INIT
(*(MemFunc*)(void *)(ftor.getMemFunc()));
(p1.*memFunc)(p2,p3,p4);
}
};

#if !defined(RHCB_CANT_OVERLOAD_ON_CONSTNESS)
template <class P1,class P2,class P3,class P4,class TRT,class CallType,
class TP1,class TP2,class TP3>
inline CBMemberOf1stArgTranslator4<P1,P2,P3,P4,TRT
(CallType::*)(TP1,TP2,TP3)>
makeFunctor(CBFunctor4<P1,P2,P3,P4>*,
TRT (CallType::* RHCB_CONST_REF f)(TP1,TP2,TP3))
{
typedef TRT (CallType::*MemFunc)(TP1,TP2,TP3);
return CBMemberOf1stArgTranslator4<P1,P2,P3,P4,MemFunc>(f );
}
#endif

template <class P1,class P2,class P3,class P4,class TRT,class CallType,
class TP1,class TP2,class TP3>
inline CBMemberOf1stArgTranslator4<P1,P2,P3,P4,
TRT (CallType::*)(TP1,TP2,TP3)const>
makeFunctor(CBFunctor4<P1,P2,P3,P4>*,
TRT (CallType::* RHCB_CONST_REF f)(TP1,TP2,TP3)const)
{
typedef TRT (CallType::*MemFunc)(TP1,TP2,TP3)const;
return CBMemberOf1stArgTranslator4<P1,P2,P3,P4,MemFunc>(f );
}
/************************* four args - with return *******************/
template <class P1,class P2,class P3,class P4,class RT>
class CBFunctor4wRet:public CBFunctorBase{
public:
CBFunctor4wRet(RHCB_DUMMY_INIT = 0){}
RT operator()(P1 p1,P2 p2,P3 p3,P4 p4)const
{
return RHCB_BC4_RET_BUG(thunk(*this,p1,p2,p3,p4));
}
protected:
typedef RT (*Thunk)(const CBFunctorBase &,P1,P2,P3,P4);
CBFunctor4wRet(Thunk t,const void *c,PFunc f,const void *mf,size_t sz):
CBFunctorBase(c,f,mf,sz),thunk(t){}
private:
Thunk thunk;
};

template <class P1,class P2,class P3,class P4,class RT,
class Callee, class MemFunc>
class CBMemberTranslator4wRet:public CBFunctor4wRet<P1,P2,P3,P4,RT>{
public:
CBMemberTranslator4wRet(Callee &c,const MemFunc &m):
CBFunctor4wRet<P1,P2,P3,P4,RT>(thunk,&c,0,&m,sizeo f(MemFunc)){}
static RT thunk(const CBFunctorBase &ftor,P1 p1,P2 p2,P3 p3,P4 p4)
{
Callee *callee = (Callee *)ftor.getCallee();
MemFunc &memFunc RHCB_CTOR_STYLE_INIT
(*(MemFunc*)(void *)(ftor.getMemFunc()));
return RHCB_BC4_RET_BUG((callee->*memFunc)(p1,p2,p3,p4));
}
};

template <class P1,class P2,class P3,class P4,class RT,class Func>
class CBFunctionTranslator4wRet:public CBFunctor4wRet<P1,P2,P3,P4,RT>{
public:
CBFunctionTranslator4wRet(Func f):
CBFunctor4wRet<P1,P2,P3,P4,RT>(thunk,0,(PFunc)f,0, 0){}
static RT thunk(const CBFunctorBase &ftor,P1 p1,P2 p2,P3 p3,P4 p4)
{
return (Func(ftor.getFunc()))(p1,p2,p3,p4);
}
};

#if !defined(RHCB_CANT_OVERLOAD_ON_CONSTNESS)
template <class P1,class P2,class P3,class P4,class RT,class Callee,
class TRT,class CallType,class TP1,class TP2,class TP3,class TP4>
inline CBMemberTranslator4wRet<P1,P2,P3,P4,RT,Callee,
TRT (CallType::*)(TP1,TP2,TP3,TP4)>
makeFunctor(CBFunctor4wRet<P1,P2,P3,P4,RT>*,Callee &c,
TRT (CallType::* RHCB_CONST_REF f)(TP1,TP2,TP3,TP4))
{
typedef TRT (CallType::*MemFunc)(TP1,TP2,TP3,TP4);
return CBMemberTranslator4wRet<P1,P2,P3,P4,RT,Callee,MemF unc>(c,f);
}
#endif

template <class P1,class P2,class P3,class P4,class RT,class Callee,
class TRT,class CallType,class TP1,class TP2,class TP3,class TP4>
inline CBMemberTranslator4wRet<P1,P2,P3,P4,RT,const Callee,
TRT (CallType::*)(TP1,TP2,TP3,TP4)const>
makeFunctor(CBFunctor4wRet<P1,P2,P3,P4,RT>*,const Callee &c,
TRT (CallType::* RHCB_CONST_REF f)(TP1,TP2,TP3,TP4)const)
{
typedef TRT (CallType::*MemFunc)(TP1,TP2,TP3,TP4)const;
return CBMemberTranslator4wRet<P1,P2,P3,P4,RT,const Callee,MemFunc>(c,f);
}

template <class P1,class P2,class P3,class P4,class RT,
class TRT,class TP1,class TP2,class TP3,class TP4>
inline CBFunctionTranslator4wRet<P1,P2,P3,P4,RT,TRT (*)(TP1,TP2,TP3,TP4)>
makeFunctor(CBFunctor4wRet<P1,P2,P3,P4,RT>*,TRT (*f)(TP1,TP2,TP3,TP4))
{
return CBFunctionTranslator4wRet
<P1,P2,P3,P4,RT,TRT (*)(TP1,TP2,TP3,TP4)>(f);
}
template <class P1,class P2,class P3,class P4,class RT,class MemFunc>
class CBMemberOf1stArgTranslator4wRet:public CBFunctor4wRet<P1,P2,P3,P4,RT>{
public:
CBMemberOf1stArgTranslator4wRet(const MemFunc &m):
CBFunctor4wRet<P1,P2,P3,P4,RT>(thunk,(void *)1,0,&m,sizeof(MemFunc)){}
static RT thunk(const CBFunctorBase &ftor,P1 p1,P2 p2,P3 p3,P4 p4)
{
MemFunc &memFunc RHCB_CTOR_STYLE_INIT
(*(MemFunc*)(void *)(ftor.getMemFunc()));
return RHCB_BC4_RET_BUG((p1.*memFunc)(p2,p3,p4));
}
};

#if !defined(RHCB_CANT_OVERLOAD_ON_CONSTNESS)
template <class P1,class P2,class P3,class P4,class RT,class TRT,
class CallType,class TP1,class TP2,class TP3>
inline CBMemberOf1stArgTranslator4wRet<P1,P2,P3,P4,RT,
TRT (CallType::*)(TP1,TP2,TP3)>
makeFunctor(CBFunctor4wRet<P1,P2,P3,P4,RT>*,
TRT (CallType::* RHCB_CONST_REF f)(TP1,TP2,TP3))
{
typedef TRT (CallType::*MemFunc)(TP1,TP2,TP3);
return CBMemberOf1stArgTranslator4wRet<P1,P2,P3,P4,RT,Mem Func>(f);
}
#endif

template <class P1,class P2,class P3,class P4,class RT,class TRT,
class CallType,class TP1,class TP2,class TP3>
inline CBMemberOf1stArgTranslator4wRet<P1,P2,P3,P4,RT,
TRT (CallType::*)(TP1,TP2,TP3)const>
makeFunctor(CBFunctor4wRet<P1,P2,P3,P4,RT>*,
TRT (CallType::* RHCB_CONST_REF f)(TP1,TP2,TP3)const)
{
typedef TRT (CallType::*MemFunc)(TP1,TP2,TP3)const;
return CBMemberOf1stArgTranslator4wRet<P1,P2,P3,P4,RT,Mem Func>(f);
}
#endif //CALLBACK_HPP

[Howard]

Ok, that's the header, but what specific lines of code give the warnings?
Something in that header, or code you wrote that uses it?

From what I understand, that warning message indicates that you are using a
type defined in a template, and you aren't stating that it's a typename that
is being used. The compiler wants you to tell it, explicitly, that the
following type is defined in a template, and you do that by adding
"typename" in front of the code that uses the type. For example, the
following issues such a warning:

template <class A, class B> class C {
public:
std::map<A, B>::iterator m_iter;
}

The following changes fix that:

template <class A, class B> class C {
public:
typename std::map<A, B>::iterator m_iter;
}

I don't know if you're getting the warnings in that header file or in your
code, but in either you can probably just add "typename" in front of each
line that's causing the problem. If that doesn't work, post here with the
specific lines that fail (and maybe the template(s) it depends on), and we
can help point out the exact correction needed.

(You can also find much discussion on name lookup and this problem if you
search on Google, by the way.)
-Howard

[©imon Tóth]

> I don't know if you're getting the warnings in that header file or in your

code, but in either you can probably just add "typename" in front of each
line that's causing the problem. If that doesn't work, post here with the
specific lines that fail (and maybe the template(s) it depends on), and we
can help point out the exact correction needed.

I'm getting warnings in that header file.

callback.h: In constructor `CBFunctionTranslator0wRet<RT,
Func>::CBFunctionTranslator0wRet(Func)':
callback.h:460: warning: `CBFunctionTranslator0wRet<RT, Func>::PFunc' is
implicitly a typename
callback.h:460: warning: implicit typename is deprecated, please see the
documentation for details
callback.h: In constructor `CBFunctionTranslator1<P1,
Func>::CBFunctionTranslator1(Func)':
callback.h:530: warning: `CBFunctionTranslator1<P1, Func>::PFunc' is
implicitly
a typename
callback.h:530: warning: implicit typename is deprecated, please see the
documentation for details
callback.h: In constructor `CBFunctionTranslator1wRet<P1, RT,
Func>::CBFunctionTranslator1wRet(Func)':
callback.h:632: warning: `CBFunctionTranslator1wRet<P1, RT, Func>::PFunc' is
implicitly a typename
callback.h:632: warning: implicit typename is deprecated, please see the
documentation for details
callback.h: In constructor `CBFunctionTranslator2<P1, P2,
Func>::CBFunctionTranslator2(Func)':
callback.h:739: warning: `CBFunctionTranslator2<P1, P2, Func>::PFunc' is
implicitly a typename
callback.h:739: warning: implicit typename is deprecated, please see the
documentation for details
callback.h: In constructor `CBFunctionTranslator2wRet<P1, P2, RT,
Func>::CBFunctionTranslator2wRet(Func)':
callback.h:847: warning: `CBFunctionTranslator2wRet<P1, P2, RT,
Func>::PFunc'
is implicitly a typename
callback.h:847: warning: implicit typename is deprecated, please see the
documentation for details
callback.h: In constructor `CBFunctionTranslator3<P1, P2, P3,
Func>::CBFunctionTranslator3(Func)':
callback.h:952: warning: `CBFunctionTranslator3<P1, P2, P3, Func>::PFunc' is
implicitly a typename
callback.h:952: warning: implicit typename is deprecated, please see the
documentation for details
callback.h: In constructor `CBFunctionTranslator3wRet<P1, P2, P3, RT,
Func>::CBFunctionTranslator3wRet(Func)':
callback.h:1062: warning: `CBFunctionTranslator3wRet<P1, P2, P3, RT,
Func>::PFunc' is implicitly a typename
callback.h:1062: warning: implicit typename is deprecated, please see the
documentation for details
callback.h: In constructor `CBFunctionTranslator4<P1, P2, P3, P4,
Func>::CBFunctionTranslator4(Func)':
callback.h:1174: warning: `CBFunctionTranslator4<P1, P2, P3, P4,
Func>::PFunc'
is implicitly a typename
callback.h:1174: warning: implicit typename is deprecated, please see the
documentation for details
callback.h: In constructor `CBFunctionTranslator4wRet<P1, P2, P3, P4, RT,
Func>::CBFunctionTranslator4wRet(Func)':
callback.h:1286: warning: `CBFunctionTranslator4wRet<P1, P2, P3, P4, RT,
Func>::PFunc' is implicitly a typename
callback.h:1286: warning: implicit typename is deprecated, please see the
documentation for details

[Jeff Flinn]

Šimon Tóth wrote:

Hi, i need to use callbacks in C++.
....
Also any other methods for using class members as callback functions
are greatly apreciated.

Have you looked at:

http://www.boost.org/libs/bind/bind.html
http://www.boost.org/doc/html/function.html
http://www.boost.org/doc/html/signals.html

Some of which are the basis for possible candidates for inclusion into a
future C++ standard.

Jeff Flinn

[Jonathan Turkanis]

Jeff Flinn wrote:

Šimon Tóth wrote:

Hi, i need to use callbacks in C++.

...

Also any other methods for using class members as callback functions
are greatly apreciated.

Have you looked at:

http://www.boost.org/libs/bind/bind.html
http://www.boost.org/doc/html/function.html
http://www.boost.org/doc/html/signals.html

Some of which are the basis for possible candidates for inclusion
into a future C++ standard.

All of them are, actually, though the first two are further along than the
third. Doug Gregor is planning to propose Boost.Signals for standardization.

Jonathan

[Old Wolf]

©imon Tóth wrote:

I'm getting warnings in that header file.

callback.h: In constructor `CBFunctionTranslator0wRet<RT,
Func>::CBFunctionTranslator0wRet(Func)':
callback.h:460: warning: `CBFunctionTranslator0wRet<RT, Func>::PFunc' is implicitly a typename
callback.h:460: warning: implicit typename is deprecated, please see the documentation for details

What is line 460?
It isn't possible to tell from the source you posted, because that
source has been wordwrapped.

How hard would it have been for you to post the line of code
that had the problem, in your first post?

[©imon Tóth]

Line 460:

CBFunctionTranslator0wRet(Func f):CBFunctor0wRet<RT>(thunk,0,(PFunc)f,0,0){}
I didn't post the error in my first post, because I was searching for a
newer version of the callback.h file. This one is from 1996. And editing
this file seems very hardcore to me :)

[Jeff Flinn]

Jonathan Turkanis wrote:

Jeff Flinn wrote:

Šimon Tóth wrote:

Hi, i need to use callbacks in C++.

...

Also any other methods for using class members as callback functions
are greatly apreciated.

Have you looked at:

http://www.boost.org/libs/bind/bind.html
http://www.boost.org/doc/html/function.html
http://www.boost.org/doc/html/signals.html

Some of which are the basis for possible candidates for inclusion
into a future C++ standard.

All of them are, actually, though the first two are further along
than the third. Doug Gregor is planning to propose Boost.Signals for
standardization.

Thanks Jonathan. I was being conservative(and slightly vague) in my
statement because I've been corrected in the use of the terms 'standard'
versus TR1, ... by others here before.

Jeff Flinn

[Howard]

"Simon Tóth" <Si****@Mail.Muni.cz> wrote in message
news:IF********@news.muni.cz...

Line 460:

CBFunctionTranslator0wRet(Func
f):CBFunctor0wRet<RT>(thunk,0,(PFunc)f,0,0){}
I didn't post the error in my first post, because I was searching for a
newer version of the callback.h file. This one is from 1996. And editing
this file seems very hardcore to me :)
(It would also have been helpful to repeat the error message along with this
line of code, don't you think?)

Looking back at the thread, it looks like PFunc is a type name, and the
template code that uses it doesn't state that explicitly. So, I think all
you need to do is go to the places where you see that error (such as the
line above), and change "PFunc" to "typename PFunc". So the above line
would be:
CBFunctionTranslator0wRet(Func f):CBFunctor0wRet<RT>(thunk,0,(typename
PFunc)f,0,0){}

(As for having a newer header, sorry, can't help you. Don't know the guy,
or the article in question. You could try Google, I suppose.)

-Howard

[©imon Tóth]

>CBFunctionTranslator0wRet(Func f):CBFunctor0wRet<RT>(thunk,0,(typename

PFunc)f,0,0){}

Doesn't work. Parse error.

[Greg Schmidt]

On Wed, 27 Apr 2005 18:11:59 GMT, ©imon Tóth wrote:

CBFunctionTranslator0wRet(Func f):CBFunctor0wRet<RT>(thunk,0,(typename
PFunc)f,0,0){}

Doesn't work. Parse error.

How about using a C++ style cast to PFunc instead of the C style cast?

--
Greg Schmidt gr***@trawna.com
Trawna Publications http://www.trawna.com/

[abecedarian]

Šimon Tóth wrote on Apr 26, 7:40 am

Hi, i need to use callbacks in C++.

Try this lib instead:
http://www.codeproject.com/cpp/FastDelegate.asp

It's superior to the Hickey implementation, has no Boost dependencies,
and the accompanying article even cantains a link to the Hickey
implementation :-)

[Old Wolf]

©imon Tóth wrote:

Line 460:

CBFunctionTranslator0wRet(Func f):CBFunctor0wRet<RT>(thunk,0,(PFunc)f,0,0){}
I didn't post the error in my first post, because I was searching for a newer version of the callback.h file. This one is from 1996. And editing this file seems very hardcore to me :)

When I compile the code you posted, I get an error on that line,
but not the error you quoted earlier! The error I get is:

error: `PFunc' undeclared (first use this function)

and that happens eight more times further down the file.

You must be declaring PFunc somewhere before you include this
header file -- probably that declaration is the source of the
problem.

[Old Wolf]

©imon Tóth wrote:

Line 460:

CBFunctionTranslator0wRet(Func f):CBFunctor0wRet<RT>(thunk,0,(PFunc)f,0,0){}

I didn't post the error in my first post, because I was searching for a newer version of the callback.h file. This one is from 1996. And editing this file seems very hardcore to me :)

Ah, sussed it now, please disregard my previous reply :)
The problem is with two-phase lookup. Here is a minimal
program that reproduces the problem:

struct Base
{
typedef void (*PFunc)();
};

void bar();

template<typename T>
struct Derived: T
{
void foo() { (Func)bar; }
};

The problem is that according to ISO C++, the compiler does
NOT look in template-dependent base classes when it's looking
up a name like 'PFunc'. So it thinks PFunc is an undefined symbol
unless you specifically say that it has come from a base class.

So, one way to solve this is to replace 'PFunc' with
'CBFunctorBase::PFunc', wherever you are getting the error.
Note, you do not use the 'typename' keyword because once you have
specified 'Base::PFunc', and Base is NOT a template, the compiler
knows what PFunc is.

I tried adding 'using Base::PFunc;' to Derived, as that is how
you could solve the problem if it was an object we were looking
up, but it actually didn't solve the problem. Maybe someone else
can make another suggestion, now that the problem is clearer?

[Old Wolf]

©imon Tóth wrote:

Line 460:

CBFunctionTranslator0wRet(Func f):CBFunctor0wRet<RT>(thunk,0,(PFunc)f,0,0){}

I didn't post the error in my first post, because I was searching for a newer version of the callback.h file. This one is from 1996. And editing this file seems very hardcore to me :)

Ah, sussed it now, please disregard my previous reply :)
The problem is with two-phase lookup. Here is a minimal
program that reproduces the problem:

struct Base
{
typedef void (*PFunc)();
};

void bar();

template<typename T>
struct Derived: T
{
void foo() { (Func)bar; }
};

The problem is that according to ISO C++, the compiler does
NOT look in template-dependent base classes when it's looking
up a name like 'PFunc'. So it thinks PFunc is an undefined symbol
unless you specifically say that it has come from a base class.

So, one way to solve this is to replace 'PFunc' with
'CBFunctorBase::PFunc', wherever you are getting the error.
Note, you do not use the 'typename' keyword because once you have
specified 'Base::PFunc', and Base is NOT a template, the compiler
knows what PFunc is.

I tried adding 'using Base::PFunc;' to Derived, as that is how
you could solve the problem if it was an object we were looking
up, but it actually didn't solve the problem. Maybe someone else
can make another suggestion, now that the problem is clearer?

[Old Wolf]

©imon Tóth wrote:

Line 460:

CBFunctionTranslator0wRet(Func f):CBFunctor0wRet<RT>(thunk,0,(PFunc)f,0,0){}

I didn't post the error in my first post, because I was searching for a newer version of the callback.h file. This one is from 1996. And editing this file seems very hardcore to me :)

Ah, sussed it now, please disregard my previous reply :)
The problem is with two-phase lookup. Here is a minimal
program that reproduces the problem:

struct Base
{
typedef void (*PFunc)();
};

void bar();

template<typename T>
struct Derived: T
{
void foo() { (Func)bar; }
};

The problem is that according to ISO C++, the compiler does
NOT look in template-dependent base classes when it's looking
up a name like 'PFunc'. So it thinks PFunc is an undefined symbol
unless you specifically say that it has come from a base class.

So, one way to solve this is to replace 'PFunc' with
'CBFunctorBase::PFunc', wherever you are getting the error.
Note, you do not use the 'typename' keyword because once you have
specified 'Base::PFunc', and Base is NOT a template, the compiler
knows what PFunc is.

I tried adding 'using Base::PFunc;' to Derived, as that is how
you could solve the problem if it was an object we were looking
up, but it actually didn't solve the problem. Maybe someone else
can make another suggestion, now that the problem is clearer?

[Old Wolf]

©imon Tóth wrote:

Line 460:

CBFunctionTranslator0wRet(Func f):CBFunctor0wRet<RT>(thunk,0,(PFunc)f,0,0){}

I didn't post the error in my first post, because I was searching for a newer version of the callback.h file. This one is from 1996. And editing this file seems very hardcore to me :)

Ah, sussed it now, please disregard my previous reply :)
The problem is with two-phase lookup. Here is a minimal
program that reproduces the problem:

struct Base
{
typedef void (*PFunc)();
};

void bar();

template<typename T>
struct Derived: T
{
void foo() { (Func)bar; }
};

The problem is that according to ISO C++, the compiler does
NOT look in template-dependent base classes when it's looking
up a name like 'PFunc'. So it thinks PFunc is an undefined symbol
unless you specifically say that it has come from a base class.

So, one way to solve this is to replace 'PFunc' with
'CBFunctorBase::PFunc', wherever you are getting the error.
Note, you do not use the 'typename' keyword because once you have
specified 'Base::PFunc', and Base is NOT a template, the compiler
knows what PFunc is.

I tried adding 'using Base::PFunc;' to Derived, as that is how
you could solve the problem if it was an object we were looking
up, but it actually didn't solve the problem. Maybe someone else
can make another suggestion, now that the problem is clearer?