input: from typing import Callable
  
  def switch_sign(x: int, conversion_func: Callable[[int], int]) -> int:
      """ Converts a positive integer to negative or a negative integer to positive using the provided conversion function.
      >>> switch_sign(-5, convert_to_positive)
      5
      >>> switch_sign(10, convert_to_negative)
      -10
      """
      return conversion_func(x)
output:     if x > 0:
          return conversion_func(x)
      else:
          return -x