callback_r_4.h

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/*
 * *** ATTENTION!  DO NOT MODIFY THIS FILE DIRECTLY! ***
 * 
 * It has automatically been generated from callback_r_x.tmpl.h
 * by param_expander.py on Sun Nov 09 16:55:48 2008.
 */

/** @file
 *  @author Bram de Greve (bramz@users.sourceforge.net)
 *  @author Tom De Muer (tomdemuer@users.sourceforge.net)
 *
 *  *** BEGIN LICENSE INFORMATION ***
 *  
 *  The contents of this file are subject to the Common Public Attribution License 
 *  Version 1.0 (the "License"); you may not use this file except in compliance with 
 *  the License. You may obtain a copy of the License at 
 *  http://lass.sourceforge.net/cpal-license. The License is based on the 
 *  Mozilla Public License Version 1.1 but Sections 14 and 15 have been added to cover 
 *  use of software over a computer network and provide for limited attribution for 
 *  the Original Developer. In addition, Exhibit A has been modified to be consistent 
 *  with Exhibit B.
 *  
 *  Software distributed under the License is distributed on an "AS IS" basis, WITHOUT 
 *  WARRANTY OF ANY KIND, either express or implied. See the License for the specific 
 *  language governing rights and limitations under the License.
 *  
 *  The Original Code is LASS - Library of Assembled Shared Sources.
 *  
 *  The Initial Developer of the Original Code is Bram de Greve and Tom De Muer.
 *  The Original Developer is the Initial Developer.
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 *  *** END LICENSE INFORMATION ***
 */



/** @class lass::util::CallbackR4
 *  @ingroup Callback
 *  @brief callback with 4 parameter4 and with returnvalue.
 *  @date 2002
 *  @author Bram de Greve [Bramz] (contact: bramz@users.sourceforge.net)
 *
 *  It's a single object that can hold a reference to a free function or an
 *  object/(const) method pair.  Once the callback is constructed, it works
 *  completely transparent.  All it shows to the client is a function that
 *  takes 4 parameter(s) and gives a returnvalue.
 */



#ifndef LASS_GUARDIAN_OF_INCLUSION_UTIL_CALLBACK_R_4_H
#define LASS_GUARDIAN_OF_INCLUSION_UTIL_CALLBACK_R_4_H



// --- OLD INTERFACES ----------------------------------------------------------

#include "util_common.h"
#include "shared_ptr.h"
#include "callback_common.h"
#include "impl/dispatcher_r_4.h"




// --- NEW INTERFACES ----------------------------------------------------------

namespace lass
{
namespace util
{


// THE CALLBACK:
// This is the actuall class you use to hold callbacks:

template
<
    typename R, 
    typename P1, typename P2, typename P3, typename P4
>
class CallbackR4
{
public:

    typedef CallbackR4<R, P1, P2, P3, P4> TSelf;
    typedef SharedPtr< impl::DispatcherR4<R, P1, P2, P3, P4> > TDispatcherPtr;

    // STRUCTORS

    /** Default constructor, construct empty callback.
     */
    CallbackR4()
    {
    }

    /** Construct function callback
     */
    template <typename FunctionType>
    CallbackR4(FunctionType iFunction):
        dispatcher_(new impl::DispatcherR4Function<R, P1, P2, P3, P4, FunctionType>(iFunction))
    {
    }

    /** Construct object/method callback.
     */
    template <typename ObjectPtr, typename Method>
    CallbackR4(ObjectPtr iObject, Method iMethod):
        dispatcher_(new impl::DispatcherR4Method<R, P1, P2, P3, P4, ObjectPtr, Method>(iObject, iMethod))
    {
    }

    /** copy constructor
     */
    CallbackR4(const TSelf& iOther):
        dispatcher_(iOther.dispatcher_)
    {
    }



    // OPERATORS

    /** assignment operator
     */
    template <typename Other>
    TSelf& operator=(const Other& iOther)
    {
        TSelf temp(iOther);
        swap(temp);
        return *this;
    }

    /** THE operator.  Executes the callback.
     */
    R operator()(typename util::CallTraits<P1>::TParam iP1, typename util::CallTraits<P2>::TParam iP2, typename util::CallTraits<P3>::TParam iP3, typename util::CallTraits<P4>::TParam iP4) const
    {
        if (isEmpty())
        {
            LASS_THROW_EX(EmptyCallback, "You've tried to call an empty CallbackR4.  Can't return a value.");
        }
        return dispatcher_->call(iP1, iP2, iP3, iP4);
    }


    // METHODS

    /** Reset to empty callback.
     */
    void reset()
    {
        dispatcher_.reset();
    }

    /** Returns true if no callback dispatcher is assigned to this object.
     */
    bool isEmpty() const
    {
        return dispatcher_.isEmpty();
    }

    /** return this->isEmpty()
     */
    bool operator!() const
    {
        return dispatcher_.isEmpty(); 
    }

    /** return !this->isEmpty())
     */
    operator num::SafeBool() const
    {
        return dispatcher_.isEmpty() ? num::safeFalse : num::safeTrue;
    }

    /** Swaps the dispatcher of this callback with the dispatcher of another.
     */
    void swap(TSelf& iOther)
    {
        dispatcher_.swap(iOther.dispatcher_);
    }

private:

    TDispatcherPtr dispatcher_;
};



/** make a CallbackR4 from a function
 *  @relates CallbackR4
 */
template <typename R, typename P1, typename P2, typename P3, typename P4> inline
CallbackR4<R, P1, P2, P3, P4> makeCallback(R (*iFunction)(P1, P2, P3, P4))
{
    return CallbackR4<R, P1, P2, P3, P4>(iFunction);
}



/** make a CallbackR4 from a function
 *  @relates CallbackR4
 */
template <typename R, typename P1, typename P2, typename P3, typename P4> inline
const CallbackR4<R, P1, P2, P3, P4>& makeCallback(const CallbackR4<R, P1, P2, P3, P4>& iCallback)
{
    return iCallback;
}



/** make a CallbackR4 from a object and method
 *  @relates CallbackR4
 */
template <typename ObjectPtr, typename Object, typename R, typename P1, typename P2, typename P3, typename P4> inline
CallbackR4<R, P1, P2, P3, P4> makeCallback(ObjectPtr iObject, R (Object::*iMethod)(P1, P2, P3, P4))
{
    return CallbackR4<R, P1, P2, P3, P4>(iObject, iMethod);
}



/** make a CallbackR4 from a object and const method
 *  @relates CallbackR4
 */
template <typename ObjectPtr, typename Object, typename R, typename P1, typename P2, typename P3, typename P4> inline
CallbackR4<R, P1, P2, P3, P4> makeCallback(ObjectPtr iObject, R (Object::*iMethod)(P1, P2, P3, P4) const)
{
    return CallbackR4<R, P1, P2, P3, P4>(iObject, iMethod);
}



}

}

#define LASS_PRIM_HAVE_PY_EXPORT_TRAITS_CALLBACK_R4
#ifdef LASS_GUARDIAN_OF_INCLUSION_UTIL_CALLBACK_PYTHON_H
#   include "callback_python.h"
#endif

#endif // Guardian of Inclusion

// EOF