code: def __str__(self) -> str:
      value_type = self.child_type
      return f"thrust::constant_iterator<{value_type}>"
  
imports: from cupyx.jit import _internal_types
  from cupyx.jit import _cuda_types
  from cupyx.jit._internal_types import Data
label_desc: Use image node_id 1 for calling the _ConstantIterator obj's underlying member method code with example usage: obj.__str__() and returns: str, value_type, str