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There are several design patterns in C++ that can be used for block diagrams:

1. Factory Method: This pattern can be used to create different types of blocks based on a common interface.

2. Template Method: This pattern can be used to create a base class for different types of blocks and provide a common structure for their implementation.

3. Composite: This pattern can be used to create complex blocks by combining multiple simple blocks.

4. Decorator: This pattern can be used to add additional functionality to a specific block without modifying its original implementation.

5. Singleton: This pattern can be used to ensure that only one instance of a specific block exists in the system, which can be useful for controlling access to shared resources or managing global settings.

6. Observer: This pattern can be used to notify other components in the system when a block's state or properties change, which can be useful for updating the user interface or triggering other events.