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C-/C++-Quelltext

#if !defined (RC_SINGLETON_H__INCLUDED)
#define RC_SINGLETON_H__INCLUDED

#if (_MSC_VER > 1000)
#pragma once
#endif 

namespace realcay
{
    template <class T>
    class RCWINDOW_API Singleton
    {
    public:
        inline static T& instance() { static T inst; return inst; }
        
    protected:
        Singleton();

        public:
        Singleton(const Singleton&);
        Singleton& operator=(const Singleton&);
    };
};
#endif // RC_SINGLETON_H__INCLUDED

C-/C++-Quelltext

class base : public realcay::Singleton<base> {};
class derived : public base 
{
public:
    derived() : m_int(0) {} // wird nicht aufgerufen

private:
    int m_int;
};

C-/C++-Quelltext

#include <map>
#define AE_RENDER 1
#define AE_USER 11

class base : public realcay::Singleton<base> 
{
    typedef void (base::*EventHandler)(const void*);

private:
    std::map<std::size_t, EventHandler> m_Hndls;

public:
    void send_message(std::size_t id, const void* data) 
    { 
        std::map<std::size_t, EventHandler>::iterator it = m_Hndls.find(id);
        if (it != m_Hndls.end()) (*this.*it->second)(data);
    }
    void register_message(std::size_t id, EventHandler hdnl) 
    { m_Hndls[id] = hdnl; }
};

C-/C++-Quelltext

class derived : public base
{
public:
     derived() : m_int(0) { register_message(AE_RENDER, &derived::on_render); }

private:
     void on_render(const void* data) { std::cout << m_int << std::endl; }

private:
    int m_int;
};