Template Function thrust::set_union(InputIterator1, InputIterator1, InputIterator2, InputIterator2, OutputIterator, StrictWeakCompare)¶
Function Documentation¶
-
template<typename
InputIterator1
, typenameInputIterator2
, typenameOutputIterator
, typenameStrictWeakCompare
>
OutputIteratorthrust
::
set_union
(InputIterator1 first1, InputIterator1 last1, InputIterator2 first2, InputIterator2 last2, OutputIterator result, StrictWeakCompare comp) set_union
constructs a sorted range that is the union of the sorted ranges[first1, last1)
and[first2, last2)
. The return value is the end of the output range.In the simplest case,
set_union
performs the “union” operation from set theory: the output range contains a copy of every element that is contained in[first1, last1)
,[first2, last1)
, or both. The general case is more complicated, because the input ranges may contain duplicate elements. The generalization is that if[first1, last1)
containsm
elements that are equivalent to each other and if[first2, last2)
containsn
elements that are equivalent to them, then allm
elements from the first range shall be copied to the output range, in order, and thenmax(n - m, 0)
elements from the second range shall be copied to the output, in order.This version of
set_union
compares elements using a function objectcomp
.The following code snippet demonstrates how to use
set_union
to compute the union of two sets of integers sorted in ascending order.- Return
The end of the output range.
- Pre
The ranges
[first1, last1)
and[first2, last2)
shall be sorted with respect tocomp
.- Pre
The resulting range shall not overlap with either input range.
- Parameters
first1
: The beginning of the first input range.last1
: The end of the first input range.first2
: The beginning of the second input range.last2
: The end of the second input range.result
: The beginning of the output range.comp
: Comparison operator.
- Template Parameters
InputIterator1
: is a model of Input Iterator,InputIterator1's
value_type
is convertable toStrictWeakCompare's
first_argument_type
. andInputIterator1's
value_type
is convertable to a type inOutputIterator's
set ofvalue_types
.InputIterator2
: is a model of Input Iterator,InputIterator2's
value_type
is convertable toStrictWeakCompare's
second_argument_type
. andInputIterator2's
value_type
is convertable to a type inOutputIterator's
set ofvalue_types
.OutputIterator
: is a model of Output Iterator.StrictWeakCompare
: is a model of Strict Weak Ordering.
#include <thrust/set_operations.h> #include <thrust/functional.h> ... int A1[7] = {12, 10, 8, 6, 4, 2, 0}; int A2[5] = {9, 7, 5, 3, 1}; int result[11]; int *result_end = thrust::set_union(A1, A1 + 7, A2, A2 + 5, result, thrust::greater<int>()); // result = {12, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0}
- See
- See
merge
- See
includes
- See
set_union
- See
set_intersection
- See
set_symmetric_difference
- See
sort
- See
is_sorted