Integer sort algorithm using random access iterators. All variants fall back to std::sort
if the data is too small.integer_sort
is a fast templated in-place hybrid radix/comparison algorithm, which in testing tends to be roughly 50% to 2X faster than std::sort
for large tests (>=100kB).
Worst-case performance is O(N * (lg(range)/s + s)) , so integer_sort
is asymptotically faster than pure comparison-based algorithms. s
is max_splits
, which defaults to 11, so its worst-case with default settings for 32-bit integers is O(N * ((32/11) slow radix-based iterations fast comparison-based iterations).
Some performance plots of runtime vs. n and log(range) are provided:
windows_integer_sort
osx_integer_sort
- Template Parameters
-
- Parameters
-
[in] | first | Iterator pointer to first element. |
[in] | last | Iterator pointing to one beyond the end of data. |
- Precondition
- [
first
, last
) is a valid range.
-
RandomAccessIter
value_type
is mutable.
-
RandomAccessIter
value_type
is LessThanComparable
-
RandomAccessIter
value_type
supports the operator>>
, which returns an integer-type right-shifted a specified number of bits.
- Postcondition
- The elements in the range [
first
, last
) are sorted in ascending order.
- Returns
void
.
- Exceptions
-
Propagates | exceptions if any of the element comparisons, the element swaps (or moves), the right shift, subtraction of right-shifted elements, functors, or any operations on iterators throw. |
- Warning
- Throwing an exception may cause data loss. This will also throw if a small vector resize throws, in which case there will be no data loss.
-
Invalid arguments cause undefined behaviour.
- Note
spreadsort
function provides a wrapper that calls the fastest sorting algorithm available for a data type, enabling faster generic-programming.