multi_callback_0.h

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/** @file
 *  @author Bram de Greve (bram@cocamware.com)
 *  @author Tom De Muer (tom@cocamware.com)
 *
 *  *** 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.
 *  
 *  All portions of the code written by the Initial Developer are:
 *  Copyright (C) 2004-2011 the Initial Developer.
 *  All Rights Reserved.
 *  
 *  Contributor(s):
 *
 *  Alternatively, the contents of this file may be used under the terms of the 
 *  GNU General Public License Version 2 or later (the GPL), in which case the 
 *  provisions of GPL are applicable instead of those above.  If you wish to allow use
 *  of your version of this file only under the terms of the GPL and not to allow 
 *  others to use your version of this file under the CPAL, indicate your decision by 
 *  deleting the provisions above and replace them with the notice and other 
 *  provisions required by the GPL License. If you do not delete the provisions above,
 *  a recipient may use your version of this file under either the CPAL or the GPL.
 *  
 *  *** END LICENSE INFORMATION ***
 */
 
 
 
/** @defgroup Callback Callback
 *  @brief library to group generalized callback functions 
 *  @date 2009
 *  @author Tom De Muer (contact: tom@cocamware.com)
 *
 */
 
#include <algorithm>
#include "callback_0.h"
 
#ifndef LASS_GUARDIAN_OF_INCLUSION_UTIL_MULTI_CALLBACK_0_H
#define LASS_GUARDIAN_OF_INCLUSION_UTIL_MULTI_CALLBACK_0_H
 
namespace lass
{
namespace util
{
 
struct MultiCallback0
{
    typedef MultiCallback0 TSelf;
    typedef Callback0 TCallback;
    
    /** Default constructor, construct empty callback list.
     */
    MultiCallback0() 
    {
    }
 
    /** Constructor: construct multi callback with a single callback.
    */
    MultiCallback0(const TCallback& iCallback) 
    {
        callbacks_.push_back(iCallback);
    }
 
    /** Constructor: construct multi callback with a two callbacks.
    */
    MultiCallback0(const TCallback& iCallback1, const TCallback& iCallback2) 
    {
        callbacks_.push_back(iCallback1);
        callbacks_.push_back(iCallback2);
    }
 
    /** copy constructor
     */
    MultiCallback0(const TSelf& iOther):
        callbacks_(iOther.callbacks_)
    {
    }
 
    /** move constructor
     */
    MultiCallback0(TSelf&& iOther) noexcept:
        callbacks_(std::move(iOther.callbacks_))
    {
    }
 
    /** assignment operator (also usable for conversion)
     */
    TSelf& operator=(const TSelf& iOther)
    {
        TSelf temp(iOther);
        swap(temp);
        return *this;
    }
 
    /** move assignment operator
     */
    TSelf& operator=(TSelf&& iOther) noexcept
    {
        callbacks_ = std::move(iOther.callbacks_);
        return *this;
    }
 
    /** add a callback to the list of callbacks to be dispatched
     */
    void add( const TCallback& iCallback )
    {
        callbacks_.push_back(iCallback);
    }
 
    /** removes a callback from the list of callbacks to be dispatched, 
     *  callbacks are tested for equivalence.  
     */
    void remove( const TCallback& iCallback )
    {
        static_cast<void>(std::remove( callbacks_.begin(), callbacks_.end(), iCallback ));
    }
 
    /** pop a callback from the list of callbacks 
     */
    void pop( TCallback& iCallback )
    {
        iCallback = callbacks_.back();
        callbacks_.pop_back();
    }
 
    /** add a callback to the list of callbacks to be dispatched
     */
    TSelf& operator += ( const TCallback& iCallback )
    {
        callbacks_.push_back(iCallback);
        return *this;
    }
 
    /** removes a callback from the list of callbacks to be dispatched
     */
    TSelf& operator -= ( const TCallback& iCallback )
    {
        remove(iCallback);
        return *this;
    }
 
    /** the number of callbacks that will be dispatched
    */
    size_t size() const
    {
        return callbacks_.size();
    }
 
    /** THE operator.  Executes the multi-callback.
     */
    void operator()() const
    {
        call();
    }
    void call() const
    {
        size_t nrCallbacks = callbacks_.size();
        for (size_t i=0;i<nrCallbacks;++i)
            callbacks_[i]();
    }
 
    /** retrieve a callback */
    const TCallback& operator[](size_t index) const
    {
        return callbacks_.at(index);
    }
    
 
    // METHODS
 
    /** Reset to empty callback.
     */
    void reset()
    {
        callbacks_.clear();
    }
 
    /** Returns true if no callback dispatcher is assigned to this object.
     */
    bool isEmpty() const
    {
        return callbacks_.size()==0;
    }
 
    /** return this->isEmpty()
     */
    bool operator!() const
    {
        return isEmpty(); 
    }
 
    /** return !this->isEmpty())
     */
    explicit operator bool() const
    {
        return !isEmpty();
    }
 
    /** Swaps the dispatchers of this multi_callback with the dispatchers of another.
     */
    void swap(TSelf& iOther)
    {
        callbacks_.swap(iOther.callbacks_);
    }
 
    /** return true if two callbacks call the same function/method,
     *  NEEDS RTTI!
     */
    bool operator==(const TSelf& iOther) const
    {
        size_t nrCallbacks = callbacks_.size();
        if (nrCallbacks != iOther.callbacks_.size())
            return false;
        for (size_t i=0;i<nrCallbacks;++i)
            if (callbacks_[i]!=iOther.callbacks_[i])
                return false;
        return true;
    }
private:
    std::vector<TCallback> callbacks_;
};
 
}
}
 
#endif
 
// EOF