#pragma once

//#include <vector>
#include <algorithm>

namespace rp {
namespace mixin {

	class observable
	{
	public:
		virtual ~observable() {}
		virtual void update() = 0;
	};

	class subjectable
	{
	public:
		subjectable() {}
		virtual ~subjectable() {}
		virtual void attach( observable* observer ) 
		{
			m_observers.push_back( observer );
		}
		virtual void detach( observable* observer )
		{
			m_observers.erase( std::remove( m_observers.begin(), m_observers.end(), observer ), m_observers.end() );
		}
		virtual void notify()
		{
			std::for_each( m_observers.begin(), m_observers.end(), std::mem_fun( &observable::update ) );
		}
	private:
		std::vector< observable* > m_observers;
	};

} // mixin	
} // rp