C++ (Cpp) CValue::get_distance示例

	void CLogic::quantize_to_allowed_states( CValue &value, const value_set &allowed_states ) const
	{
		const CValue *nearest_allowed_state = NULL;
		float distance_to_current = 0;
		float distance_to_nearest_allowed_state = 0;
		bool first = true;

		for( value_set::const_iterator i = allowed_states.begin(); i != allowed_states.end(); i++ )
		{
			const CValue *allowed_state = *i;
			if( value.get_type() != allowed_state->get_type() )
			{
				INTEGRA_TRACE_ERROR << "Value type mismatch whilst quantizing to allowed states";
				continue;
			}

			distance_to_current = value.get_distance( *allowed_state );

			if( first || distance_to_current < distance_to_nearest_allowed_state )
			{
				distance_to_nearest_allowed_state = distance_to_current;
				nearest_allowed_state = allowed_state;
				first = false;
			}
		}

		if( !nearest_allowed_state )
		{
			INTEGRA_TRACE_ERROR << "failed to quantize to allowed states - allowed states is empty";
			return;
		}

		assert( nearest_allowed_state->get_type() == value.get_type() );

		value = *nearest_allowed_state;
	}