enum ComparisonResult
	{
		less = -1,
		equal = 0,
		greater = 1
	};
		
	template<typename T>
	class CompareChain : std::binary_function<const T&, const T&, bool>
	{
		typedef boost::function<ComparisonResult( const T& lhs, const T& rhs )> CompareFunctor;
	public:
		CompareChain( const CompareFunctor& f1 )
		{
			functions.push_back( f1 );
		}
		
		CompareChain( const CompareFunctor& f1, const CompareFunctor& f2 )
		{
			functions.push_back( f1 );
			functions.push_back( f2 );
		}
		
		CompareChain( const CompareFunctor& f1, const CompareFunctor& f2, const CompareFunctor& f3 )
		{
			functions.push_back( f1 );
			functions.push_back( f2 );
			functions.push_back( f3 );
		}
		
		bool operator()( const T& lhs, const T& rhs ) const
		{
			BOOST_FOREACH( CompareFunctor f, functions )			
			{
				switch( f( lhs, rhs ) )
				{
					case less:
						return true;
					case greater:
						return false;
				}
			}
			return false;
		}
	private:
		std::vector<CompareFunctor> functions;
	};