"""Create fallback_executor
Generated by Phi-Octopus Eden
2025-11-08 00:03:45.863928
"""

```python
from typing import Callable


class FallbackExecutor:
    """
    A class that provides a fallback mechanism for executing functions,
    handling exceptions and providing default return values in case of errors.
    """

    def __init__(self, primary: Callable):
        self.primary = primary

    def with_fallback(self, fallback: Callable, *fallback_args, **fallback_kwargs) -> Callable:
        """
        Decorator that adds a fallback function to the primary function.

        :param fallback: The fallback callable that will be executed if an exception occurs.
        :param fallback_args: Arguments for the fallback function.
        :param fallback_kwargs: Keyword arguments for the fallback function.
        :return: A wrapped callable with fallback support.
        """
        def wrapper(*args, **kwargs):
            try:
                return self.primary(*args, **kwargs)
            except Exception as e:
                print(f"Primary function failed with exception: {e}")
                return fallback(*fallback_args, **fallback_kwargs)

        return wrapper


def example_primary_function(x: int) -> int:
    """
    A simple example of a primary function that may fail.
    """
    if x < 0:
        raise ValueError("Negative value provided")
    return x * x


def default_fallback() -> str:
    """
    A simple fallback function returning a string when the primary function fails.
    """
    return "Fallback value"


if __name__ == "__main__":
    # Creating an instance of FallbackExecutor
    executor = FallbackExecutor(primary=example_primary_function)
    
    # Wrapping the example function with a fallback
    safe_example_func = executor.with_fallback(fallback=default_fallback)

    # Example usage
    print(safe_example_func(4))  # Should output: 16 (primary function executed)
    print(safe_example_func(-2))  # Should output: "Fallback value" (fallback function executed)
```