# Parallel Iteration

Types `const_range_type` and `range_type` model the Container Range concept. The types differ only in that the bounds for a `const_range_type` are of type `const_iterator`, whereas the bounds for a `range_type` are of type iterator.

The following table provides additional information on the members of this template class.
Member | Description
--- | ---
const_range_type range() const | Returns: `const_range_type` object representing all keys in the table.
range_type range() | Returns: `range_type` object representing all keys in the table.

Parent topic: concurrent_unordered_set and concurrent_unordered_multiset Template Classes

## See Also

Container Range