ConstMethod.h

/*
  Copyright (C) 2005 by Dr. Marc Boris Duerner
 
  This library is free software; you can redistribute it and/or
  modify it under the terms of the GNU Lesser General Public
  License as published by the Free Software Foundation; either
  version 2.1 of the License, or (at your option) any later version.
 
  As a special exception, you may use this file as part of a free
  software library without restriction. Specifically, if other files
  instantiate templates or use macros or inline functions from this
  file, or you compile this file and link it with other files to
  produce an executable, this file does not by itself cause the
  resulting executable to be covered by the GNU General Public
  License. This exception does not however invalidate any other
  reasons why the executable file might be covered by the GNU Library
  General Public License.
 
  This library is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  Lesser General Public License for more details.
 
  You should have received a copy of the GNU Lesser General Public
  License along with this library; if not, write to the:
  Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  Boston, MA 02110-1301 USA
*/
 
#ifndef Pt_ConstMethod_h
#define Pt_ConstMethod_h
 
#include <Pt/Callable.h>
#include <Pt/Connectable.h>
#include <Pt/Slot.h>
 
namespace Pt {
 
template <typename R, typename ClassT, typename... As>
class ConstMethod : public Callable<R, As...>
{
    public:
        typedef R (ClassT::*MemFuncT)(As...) const;
 
    public:
        ConstMethod(ClassT& object, MemFuncT method)
        : _object(&object)
        , _method(method)
        { }
 
        ClassT& object()
        {
            return *_object;
        }
 
        const ClassT& object() const
        {
            return *_object;
        }
 
        // inherit doc
        R call(As... args) const
        {
            return (_object->*_method)(args...);
        }
 
        // inherit doc
        void invoke(As... args) const
        {
            (_object->*_method)(args...);
        }
 
        // inherit doc
        ConstMethod* clone() const
        {
            return new ConstMethod(*this);
        }
 
        bool operator==(const ConstMethod& other) const
        {
            return _object == other._object && _method == other._method;
        }
 
    private:
        ClassT* _object;
        MemFuncT _method;
};
 
template <typename R, typename ClassT, typename... As>
class ConstMethodSlot : public BasicSlot<R, As...>
{
    public:
        explicit ConstMethodSlot(const ConstMethod<R, ClassT, As...>& method)
        : _method(method)
        { }
 
        // inherit doc
        Slot* clone() const
        {
            return new ConstMethodSlot(*this);
        }
 
        // inherit doc
        virtual const Callback* callable() const
        {
            return &_method;
        }
 
        // inherit doc
        virtual void onConnect(const Connection& connection)
        {
            _method.object().onConnectionOpen(connection);
        }
 
        // inherit doc
        virtual void onDisconnect(const Connection& connection)
        {
            _method.object().onConnectionClose(connection);
        }
 
        // inherit doc
        virtual bool equals(const Slot& slot) const
        {
            const ConstMethodSlot* other = dynamic_cast<const ConstMethodSlot*>(&slot);
            return other && _method == other->_method;
        }
 
    private:
        ConstMethod<R, ClassT, As...> _method;
};
 
template <typename R, typename BaseT, typename ClassT, typename... As>
ConstMethod<R, ClassT, As...> callable(ClassT& object, R (BaseT::*method)(As...) const)
{
    return ConstMethod<R, ClassT, As...>(object, method);
}
 
template <typename R, typename BaseT, typename ClassT, typename... As>
ConstMethodSlot<R, ClassT, As...> slot(ClassT& object, R (BaseT::*method)(As...) const)
{
    return ConstMethodSlot<R, ClassT, As...>(callable(object, method));
}
 
} // namespace Pt
 
#endif