Делегат на C++03

#include <vector>
 
class Delegate
{
    std::vector<void(*)()> farr;
public:
    Delegate  ();
    ~Delegate ();
 
    bool operator()(void);
    bool operator +=(void (*pf)());
    bool operator -=(void (*pf)());
};

#include "Delegate.h"
 
Delegate:: Delegate () {}
Delegate::~Delegate () {}
bool Delegate::operator()(void)
{
    bool ret_val = false;
    try
    {
        for (std::vector<void(*)()>::const_iterator curr_it = farr.begin(); curr_it != farr.end(); ++curr_it)
        {
            (*curr_it)();
        }
    }
    catch (...)
    {
        ret_val = true;
    }
    return ret_val;
}
bool Delegate::operator +=(void (*pf)())
{
    bool ret_val = false;
    try
    {
        farr.push_back(pf);
    }
    catch (...)
    {
        ret_val = true;
    }
    return ret_val;
}
bool Delegate::operator -=(void (*pf)())
{
    bool ret_val = false;
    try
    {
        for (std::vector<void(*)()>::iterator curr_it = farr.begin(); curr_it != farr.end(); ++curr_it)
        {
            if ((*curr_it) == pf)
            {
                farr.erase(curr_it);
                break;
            }
        }
    }
    catch (...)
    {
        ret_val = true;
    }
    return ret_val;
}

(foo.onClick += Event1) += Event2;