'cleard(addr, ndx = 0) -> int
Clears dword at ``((uint32_t*)addr)[ndx]`` from the cache and
returns the removed value or `None` if the address was not completely set.
Examples:
>>> l = MemLeak(lambda a: None)
>>> l.cache = {0:\'a\', 1: \'b\', 2: \'c\', 3: \'d\'}
>>> l.n(0, 4) == \'abcd\'
True
>>> l.cleard(0) == unpack(\'abcd\', 32)
True
>>> l.cache'

def cleard(self, addr, ndx=0):

    return self._clear(addr, ndx, 4)
