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#include <algorithm>
#include <iostream>
#include <string>
#include <cstring>
#include <iterator>
#include <vector>
using namespace std;
bool caseless(string const &left, string const &right)
{
return strcasecmp(left.c_str(), right.c_str()) < 0;
}
int main()
{
string set1[] =
{
"kilo", "lima", "mike", "november",
"oscar", "papa", "quebec"
};
string set2[] = { "papa", "quebec", "romeo"};
string result[8];
copy(result,
set_union(set1, set1 + 7, set2, set2 + 3, result),
ostream_iterator<string>(cout, " "));
cout << '\n';
string set3[] = { "PAPA", "QUEBEC", "ROMEO"};
copy(result,
set_union(set1, set1 + 7, set3, set3 + 3, result, caseless),
ostream_iterator<string>(cout, " "));
cout << '\n';
std::vector<int> v1 = {1, 2, 3, 4, 5, 5, 5};
std::vector<int> v2 = { 3, 3, 3, 4, 5, 6, 7};
set_union(v1.begin(), v1.end(), v2.begin(), v2.end(),
ostream_iterator<int>(cout, " "));
cout << '\n';
}
// Displays:
// kilo lima mike november oscar papa quebec romeo
// kilo lima mike november oscar papa quebec ROMEO
// 1 2 3 3 3 4 5 5 5 6 7
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