def get_function_type(self):
"""Return unique function type of dispatcher when possible, otherwise
return None.
A Dispatcher instance has unique function type when it
contains exactly one compilation result and its compilation
has been disabled (via its disable_compile method).
"""
if not self._can_compile and len(self.overloads) == 1:
cres = tuple(self.overloads.values())[0]
return types.FunctionType(cres.signature)
def as_type(self):
"""
Convert this signature to a first-class function type.
"""
return types.FunctionType(self)
