A mask range-hashing class (uses a bit-mask).
| Parameter | Description | Default Value | 
| Size_Type | Size type. | size_t | 
| Type | Definition | Description | 
| size_type | Size_Type | Size type. | 
| Method | Description | 
| void swap (direct_mask_range_hashing &r_other) | Swaps content. | 
| Method | Description | 
| void notify_resized (size_type size) | Notifies the policy object that the container's size has changed to size. | 
| Method | Description | 
| inline size_type operator() (size_type hash) const | Transforms the hash value hash into a ranged-hash value (using a bit-mask). |