Parallel Iteration
The types const_range_type
and range_type
model the Range Concept and provide methods to access the bounds of the range, as shown in Table 5-5. 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
.
Use the range types in conjunction with parallel_for, parallel_reduce
, and parallel_scan
to iterate over pairs in a concurrent_hash_map
.
Table 5-5. Concept for concurrent_hash_map range R
Pseudosignature |
Semantics |
---|---|
|
First item in range |
|
One past last item in range |
-
const_range_type range( size_t grainsize ) const
Effects: constructs a
const_range_type
representing all keys in the table. Thegrainsize
parameter is in units of hash table slots. Each slot typically has only one key-value pair.Returns: a
const_range_type
object for the table.-
range_type range( size_t grainsize )
Returns: like
const_range_type
, but returns arange_type
object for the table.
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