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#include "stdafx.h"
#include "Subject.h"
#include "Observer.h"
//------------------------------------------------------------------------------
// public:
//------------------------------------------------------------------------------
Subject::Subject() : m_observer_list()
{
}
//------------------------------------------------------------------------------
Subject::~Subject()
{
}
//------------------------------------------------------------------------------
void Subject::notify()
{
// call update for all observers in the list
for (std::list<Observer *>::iterator iter = m_observer_list.begin(); iter != m_observer_list.end(); ++iter)
{
(*iter)->update(*this);
}
}
//------------------------------------------------------------------------------
void Subject::attach(Observer &observer)
{
for (std::list<Observer *>::iterator iter = m_observer_list.begin(); iter != m_observer_list.end(); ++iter)
{
if (*iter == &observer)
{
return;
}
}
m_observer_list.push_back(&observer);
}
//------------------------------------------------------------------------------
void Subject::detach(const Observer &observer)
{
for (std::list<Observer *>::iterator iter = m_observer_list.begin(); iter != m_observer_list.end(); ++iter)
{
if (*iter == &observer)
{
m_observer_list.erase(iter);
}
}
}
//==============================================================================
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