callback interface

Dev.Write 2013. 9. 20. 16:44 Posted by zetz
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#pragma once
 
// interface
class ICallback
{
public:
    ICallback() {}
    virtual ~ICallback() {}
    virtual void run() = 0;
};
 
// no argument
template<class Func>
class Callback0 : public ICallback
{
public:
    Callback0(Func f) : m_func(f) {}
    virtual void run() { m_func(); }
private:
    Func    m_func;
};
 
// one argument
template<class Func, class Arg0>
class Callback1 : public ICallback
{
public:
    Callback1(Func f, Arg0 a0) : m_func(f), m_arg0(a0) {}
    virtual void run() { m_func(m_arg0); }
private:
    Func    m_func;
    Arg0    m_arg0;
};
 
// member func
template<class Class, class Func>
class CallbackObject0 : public ICallback
{
public:
    CallbackObject0(Class* object, Func func) : m_object(object), m_func(func) {}
    virtual void run() { (m_object->*m_func)(); }
private:
    Class*  m_object;
    Func    m_func;
};
 
template<class Class, class Func, class Arg0>
class CallbackObject1 : public ICallback
{
public:
    CallbackObject1(Class* object, Func func, Arg0 a0) : m_object(object), m_func(func), m_arg0(a0) {}
    virtual void run() { (m_object->*m_func)(m_arg0); }
private:
    Class*  m_object;
    Func    m_func;
    Arg0    m_arg0;
};
 
 
// utility
template<class Ret>
ICallback* MakeCallback(Ret (*func)()) {
    return new Callback0<Ret (*)()>(func);
}
 
template<class Ret, class Arg0>
ICallback* MakeCallback(Ret (*func)(), Arg0 a0) {
    return new Callback1<Ret (*)(Arg0)>(func, a0);
}
 
 
template<class Class, class Ret>
ICallback* MakeCallback(Class* object, Ret (Class::*func)()) {
    return new CallbackObject0<Class, Ret (Class::*)()>(object, func);
}
 
template<class Class, class Ret, class Arg0>
ICallback* MakeCallback(Class* object, Ret (Class::*func)(Arg0), Arg0 a0) {
    return new CallbackObject1<Class, Ret (Class::*)(Arg0), Arg0>(object, func, a0);
}
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